Question 1

What's new in the latest Soup CLI release?

Accepted Answer

v0.77.0, tagged 26 October 2026, has no codename: upstream titled it with a sentence, what v0.76 warned about is now refused. It is a cut of the development branch, and its release body opens: 151 of the 226 pull requests in this release came from 44 people outside the maintainer. The 31 staged fields, validated and read by nothing, now stop the load when set away from their default, each on a line ending 'refused as of v0.77. Delete the line.'; so do data.remove_unused_columns: true and an explicit training.quantization of 4bit or 8bit, or load_in_8bit: true, on a task that never quantises, and soup ab --beta exits 2. Fourteen of the fifteen settings on upstream's list that v0.76 accepted without a word and never applied are refused too, each named with what to change; the fifteenth, a malformed KTO label, drops its row at data load with a reason. soup train exits 1 with 'Config validation error:' and soup doctor --config exits 2, so a config that loaded on v0.76 can stop loading: run soup doctor --config soup.yaml before upgrading a working setup, and again after each fix, because a cross-field refusal is reported one at a time. Python is now 3.11 to 3.13, and on Python 3.10 pip and pipx keep installing v0.76.x. AWQ and GPTQ export are removed with their extras; if you still need them, they need v0.76.x and its [awq] or [gptq] extra, and upstream notes that both projects are archived and incompatible with [train]. On the transformers backend, soup serve's /v1/tools/python and /v1/tools/bash need --tool-auth-token on every bind, loopback included, and the python route answers HTTP 501 unless the host provides OS-level isolation, as bash already did. training.gradient_checkpointing now reaches the trainer: with the default false, grpo, ipo, bco, reward_model and online_dpo train with checkpointing off, so set it to true to keep the memory you had. A dpo, ipo or grpo run resumed from a checkpoint trained a freshly initialised adapter before this release: re-run any such resumed training. New: DPO, ORPO, SimPO and KTO train natively on Apple Silicon through Soup's own MLX loop, and MLX text SFT gains native DoRA, eval_steps, the loss watchdog and seeded runs. Layer streaming, which upstream describes as its implementation of layer-to-layer streaming of a frozen base (L2L, Pudipeddi et al. 2020), reaches the DeepSeek-V3 MoE family. Also new: soup train records the SHA-256 of a local training file and transformers-backend runs record the Hub commit of the base they loaded, and soup ship --require-provenance, a strict offline drift check, compares the evidence's stamps with the adapter, task and source bytes, suite version and verdict policy in front of it; an LLM-judge GRPO reward (training.reward_fn: judge_rank, which sends prompts and completions to the judge host you configure); soup-cli[documents] for PDF and DOCX ingest; soup merge --low-memory; native Sesame CSM fine-tuning; and soup --version. No security advisory comes with it; 0.77.x is supported, and 0.76.x receives security fixes only until 0.78.0. The flagship is still BETA: layer streaming with NF4 fine-tunes Llama-3.1-8B on a 4 GB laptop GPU at 119.6 tok/s in 3.32 GB (measured on v0.72.2 at 952 MHz, before the NF4 gradient repair; a post-repair row from another RTX 3050 Laptop, taken at a different clock, is recorded, and the two are not directly comparable), and DPO, ORPO, SimPO and KTO stream too; the preprint is unchanged. Totals at v0.77.0: 1070 test files, 171 recipes, 21 templates, 23 training tasks, 20 data formats (one of them, cross_encoder, only with task: cross_encoder), 17 quantization formats and eleven streaming architectures, under Apache-2.0. The v0.77.0 notes are at https://trysoup.dev/docs/warnings-now-refused, and every release from v0.71 on is listed at https://trysoup.dev/docs/whats-new.

Question 2

Will my soup.yaml from v0.76 still load on Soup v0.77.0?

Accepted Answer

Not necessarily, and you can find out before you spend a GPU hour: after upgrading, run 'soup doctor --config soup.yaml'. v0.77.0 ends the one-release notice v0.76 gave, so what v0.76 loaded with a warning now stops the load. The 31 staged fields, validated and read by nothing, are refused when set away from their default, each on a line ending 'refused as of v0.77. Delete the line.' (among them 'training.lr_groups', 'early_stop_patience', 'citation_recall_threshold', 'forgetting_eval_steps', 'quantize_ref_model', 'long_context_grpo', 'vision_grpo' and the 'data.video_*' keys); none of them changed what a run did, so deleting them changes no result. Two of the 31, 'training.rl_checkpoint_include_ref_model' and 'rl_checkpoint_include_rollout_buffer', were never warned about: an explicit false loads and true is refused. Two deprecated config values are refused too: 'data.remove_unused_columns: true', which configs written by soup autopilot and run-config dumps from v0.75 and earlier carry; an explicit 'training.quantization' of 4bit or 8bit, or 'load_in_8bit: true', on distill, classifier, reranker, cross_encoder, prm, moe_lora_routing, unlearn or asr; and the retired 'soup ab --beta' flag exits 2. Upstream also lists fifteen settings that v0.76 accepted without a word and never applied; fourteen of them now stop the load, each named with what to change, among them 'training.use_mod: true' where no Mixture-of-Depths router is installed, 'expand_layers' with a LoRA rank, 'neftune_alpha' on the 14 tasks that never apply it, 'relora_steps' where the loss has a frozen reference, 'quantization: 8bit' on backend unsloth, 'stream_layers' with 'use_cut_ce', and 'lora.rank_pattern' or 'alpha_pattern' on backend mlx or unsloth; the fifteenth item on that list, a KTO label that is not a boolean, a documented string or exactly -1, 0 or 1, is not a config refusal: such rows are dropped at data load with a reason. 'soup train' exits 1 with 'Config validation error:', and 'soup doctor --config' exits 2 with the same lines and 'Config could not be loaded (see above).' (it no longer prints 'All checks passed!' above a refusal) and exits 0 when the config loads. A cross-field refusal still arrives one per run, so fix the setting it names and run the command again until it prints no error. Its table of settings known to be unread covers eight backend and task combinations, so a clean report is not proof that every key is read (upstream tracks that as #1815). Behaviour that changes even when the config loads: 'training.gradient_checkpointing' now reaches the trainer, so with the default false grpo, ipo, bco, reward_model and online_dpo train with checkpointing off (set it to true to keep the memory you had); 'lora.use_rslora' on MLX and Unsloth and 'freeze_layers' or 'freeze_ratio' with LoRA are now applied, so those runs change; 'unlearn_alpha: 0.0' is pure forget loss; the bundled scorers moved to revision 7, so write a v0.76 baseline again; and 'soup train' with stdin piped or redirected and no '--yes' exits 3, so pass '--yes' in scripts. A dpo, ipo or grpo run resumed from a checkpoint before v0.77.0 trained a freshly initialised adapter: re-run it. v0.77.0 also needs Python 3.11 to 3.13. Coming from v0.75, the v0.76.0 refusals apply as well; they are on the settings-refused-at-load page, and the v0.77.0 ones on the warnings-now-refused page.

Question 3

Can Soup fine-tune and align a model that is bigger than my GPU's VRAM (layer streaming, v0.72.4)?

Accepted Answer

Yes. You can fine-tune Llama-3.1-8B on a 4 GB laptop GPU, measured at 119.6 tok/s with peak VRAM of 3.32 GB (measured on v0.72.2 at 952 MHz, before the v0.73.0 NF4 gradient repair; a post-repair row from another RTX 3050 Laptop, taken at a different clock, is recorded in the benchmarks directory, and the two are not directly comparable), and it ships BETA within a scope the release states precisely. Set 'training.stream_layers: true' in soup.yaml and the frozen base is never loaded resident. Soup rewrites the checkpoint once into one safetensors shard per decoder layer (cached under ~/.soup/layer-stream/, overridable with SOUP_LAYER_STREAM_CACHE_DIR and keyed to the quantisation as well as a fingerprint of the source checkpoint, so switching precision or retraining a base in place re-shards instead of silently streaming the wrong bytes), holds that store in CPU RAM page-locked when the machine allows it, and copies one layer at a time into a small pool of pre-allocated VRAM buffers on a dedicated CUDA stream, so the load of the next layer overlaps the compute of the current one. The base model is built on PyTorch's meta device, so only the embeddings, the final norm, an untied LM head and the LoRA adapters with their gradients and optimizer state ever occupy VRAM. Peak VRAM is therefore bounded by the size of one layer plus the embeddings, the adapters and the activations, not by the size of the model. Each layer is read twice per step, once in the forward pass and once when the backward pass recomputes it, because pushing gradient down to the layers below needs the weights, which is why streaming costs time rather than being free (recomputing is the default; since v0.77.0, on task sft only, 'training.stream_recompute: off' keeps every streamed layer's activations instead of recomputing them, and 'auto' keeps them for as many of the last layers as fit, on the RAM tier on CUDA only; the backward still re-reads each layer's weights, and the gradients measured bit-identical to the recompute's under deterministic algorithms). Adding 'quantization: 4bit' quantises that streamed base to NF4 and shrinks the RAM store about fourfold, which is what brings 8B within reach of a card that cannot hold even a quarter of it. Measured on a 4 GB RTX 3050 Laptop at batch 1, sequence length 512, gradient checkpointing on, 50 steps after 10 warm-up: Llama-3.1-8B-Instruct at 119.6 tok/s in 3.32 GB with the base page-locked at a 3.60 GB store and the GPU 100% busy, and Qwen2.5-3B at 264.2 tok/s in 1.76 GB. On the bf16 path Qwen2.5-3B trains in 2.15 GB where a resident run runs out of memory. The honest cost is 1.43x slower than resident training, measured at 0.5B, the only apples-to-apples comparison available on that box. Correctness is not part of the trade: a streamed run was measured bit-exact against a resident run at the same precision in the v0.72.x gates (since v0.76.0 the streamed NF4 forward follows bitsandbytes' own fused-versus-dequantized dispatch, the same kernels as resident NF4, and no new bit-exact record exists for it; the backward still dequantises), and logit equality, non-zero gradients at layer 0 and a matching multi-step loss curve are regression tests rather than one-off measurements. v0.72.3 widened it from a demonstration into something you can plan a run on. Nine model types streamed after it, not three: llama, qwen2, qwen3, mistral, gemma, gemma2, gemma3_text, phi and phi3, each with its forward logits compared against the same model loaded resident (NF4 against a resident NF4 load) and found equal, on tiny from-config CPU float32 fixtures rather than real checkpoints, and v0.74.0 later took the allowlist to ten with qwen4_exp text plus the qwen3_5 dense and MoE aliases, on weaker evidence that the docs state rather than smooth over. v0.77.0 took it to eleven with deepseek_v3, the DeepSeek-V3 MoE family, gated on resident-vs-streamed parity forward and backward on a tiny from-config model on CPU (no real DeepSeek-V3 checkpoint was compared against a resident run, and there is no NF4 parity check for it); the streaming tasks stay the same five, and no throughput figure and no preference-loss parity is claimed for it. Phi-3 fuses Q, K and V into a single qkv_proj, so there is no q_proj to substitute, and it is bit-exact anyway. Multimodal gemma3 is deliberately refused; only gemma3_text is accepted, because streaming a vision wrapper as a causal LM is exactly the failure an allowlist exists to prevent. There is no throughput measurement for any of the six newly supported families, so none is claimed. Batches above 1 and gradient accumulation both work now, and the release measured which one to reach for rather than reasoning about it. On Qwen2.5-0.5B in bf16 at sequence length 256 with a pinned store: batch 1 with no accumulation runs at 556.6 tok/s in 0.842 GB, batch 1 with accumulation 4 runs at 540.1 tok/s in 0.846 GB, and batch 4 with no accumulation runs at 1378.0 tok/s in 2.28 GB. At the same effective batch of 4, raising batch_size measured about 2.52x faster than accumulating, because a real batch amortises each layer load over more tokens while accumulation re-reads the entire base for every micro-batch, which is why the layer reads per 1000 tokens stay flat across accumulation 1, 2 and 4. Accumulation still earns its place: it holds peak VRAM almost exactly flat where a bigger batch does not. Raise batch_size while the budget allows, then accumulate. Because batches now scale, there is a pre-flight that accounts for them. Streaming bounds the weights, but activations and the logits tensor are untouched by it and both scale with batch times sequence length. On a 151,936-token vocabulary at batch 8 the logits tensor alone measured 8.71 GB, which is 146 times the entire layer-buffer pool of 0.060 GB. soup train now predicts peak VRAM before the run and refuses one that will not fit, naming training.batch_size and data.max_length as the two knobs that scale it linearly. The estimate was fitted against ten real runs across two models with a 3.1-fold vocabulary contrast, with a worst error of 0.85%, and it never under-predicted any of them. That contract later failed: v0.73.1 measured it under-predicting at long sequence (0.934x the real peak at sequence 5120 and 0.787x at 6144), which the ten-run grid structurally could not have caught because all ten of its rows sit at sequence 256 or 512, so it varies batch and says nothing about sequence length. It also corrected a real bug: the old estimator charged 6 bytes per logit element from first principles, where the measured peak is 14: 12 for the loss arithmetic (the bf16 logits alongside three fp32 buffers of the same shape) plus 2 for the model's output kept alive across the backward. That under-predicted the largest term in the budget by 2.33x. This matters most on Windows, where WDDM does not raise on overcommit: a run that should have failed instead reached a 9.27 GB peak on a card with 4.29 GB, silently, by paging to host memory. The panel also prints a throughput forecast, quoted as a range from a GEMM ceiling measured on your own card in that session and printed next to the SM clock, never a compiled-in per-card constant. That is a response to a measurement: this one card produced 3.5 and 7.6 TFLOPS in two different sessions at the same reported clock, so a baked-in number would have been wrong about half the time. Streamed runs measured in v0.72.3 landed at 68 to 100% of their measured ceiling, while the post-repair 8B row published in v0.76.0, from another RTX 3050 Laptop, reads 59% of its own same-session ceiling (not like-for-like, per the record), which is why the line calls itself a bound and not a promise. The flags --resume and --hf-resume work with streaming now. They had to be refused before because adapters could not be loaded into a streamed model at all: PyTorch's load_state_dict narrows keys by child name, so a canonically saved checkpoint matched 0 of N tensors, and because PEFT reports missing keys as a warning rather than an error, a resumed run silently reproduced the from-scratch loss curve exactly. The streaming layer now redirects canonical keys at load time, mirroring the save-side fix from v0.72.1. The fix is load-side only, so v0.72.0's forward-path bit-exactness results stand without being re-run. One honest limit: end-to-end resume could not be demonstrated on the development box, for a reason that has nothing to do with streaming, since transformers refuses torch.load below torch 2.6 under CVE-2025-32434 and that blocks every resume there (since v0.75.0 the declared torch floor is 2.6.0, so a supported install can no longer hit that). The streaming-specific half, the adapter round-trip and loss continuity, is verified on the production CUDA path. Loading into a streamed model works. Until v0.75.1 named_parameters() and state_dict() disagreed in memory, the deliberate cost of a serialisation-only fix, and on peft 0.21 or newer that mismatch made a streamed adapter save as a 40-byte file holding zero tensors; v0.75.1 made names and keys one spelling, and an adapter saved with stream_layers: true on peft 0.21 or newer before it must be re-trained. For a base too large even for RAM there is now a disk overflow tier. stream_source: auto is the default and uses RAM when the base fits, falling back to an NVMe disk tier when it does not, holding no resident copy of the base (since v0.76.0 a background thread reads the shards through direct I/O into host staging buffers, staging up to 'training.stream_read_ahead' minus one layers ahead of the layer in use). stream_source: ram insists and refuses rather than falling back, so a run that must stay in RAM cannot quietly become a disk run. Non-NVMe media is refused outright, including media Soup cannot identify, because the streamer reads every shard twice per step, which on a spinning disk is 160 seeks per step for an 80-layer model. soup doctor --disk reports what was detected (NVMe, SATA SSD, HDD or Unknown) and is opt-in because the probe costs about 9 seconds cold and about 2.4 seconds warm on Windows. The v0.72.3 synchronous disk reader's correctness was verified bit-exact against the RAM tier; the v0.76.0 reader is gated by byte-identity against that source. How long a disk-tier step takes was first measured in v0.76.0, on a second laptop (an RTX 5070 Laptop 8 GB with two NVMe drives, Windows) and only on a synthetic 70B-shaped NF4 store of 36 GB with random weights, timing only, with no RAM-versus-disk ratio: a cold step went from 110.5 s on the previous synchronous reader to 16.2 to 17.3 s on the direct-I/O reader, and from 17.4 s to 9.97 s across two drives ('SOUP_LAYER_STREAM_STRIPE_DIRS'), while a sustained-load probe measured 1.28x and 1.41x in two rounds and reached no formal verdict. A store that fits in RAM is still faster on the RAM tier, which stream_source auto picks. No real 70B checkpoint was trained. v0.72.4 then opened the whole path to the preference losses. DPO, ORPO, SimPO and KTO run against a streamed base now, with the same config keys, so alignment stops being the step that forces you to rent a bigger card. The hard part was DPO's reference model, because the obvious implementation builds a second copy of the model and doubles the weights, which defeats the entire premise. Soup takes the reference from the same streamed base with its LoRA adapters switched off, so policy and reference are one set of weights, one RAM store and one buffer pool, and the adapter is the only difference between the two forward passes. That is measured rather than asserted, because a loss curve cannot detect its failure: if disabling the adapter were a silent no-op through the streamed path, every log-ratio would be zero and the loss would sit at 0.6931 forever, which reads as slow training rather than as a bug. On the reference box in bf16 with a 365.2M-parameter model, streamed DPO peaked at 81.87 MB against streamed supervised fine-tuning's 89.53 MB, which is 0.914x, with a byte-identical RAM store and buffer pool, while the same harness with a real second instance forced in reached 812.32 MB, moving the peak by 730.44 MB against 730.44 MB of weights, exactly one copy. A zero-adapter control measured a policy-versus-reference gap of exactly zero, proving the gap in the real run comes from the adapter. Read the 0.914x as no second copy rather than as a saving: it sits below 1 because that fixture splits its 64 positions into a 32-token prompt and a 32-token completion, so the logits tensor is smaller, and the model is synthetic rather than a real checkpoint. Upstream's CHANGELOG states the loss is bit-exact against a resident run for all four, and the benchmark record shows it for DPO (difference exactly 0.0, float32 on CPU, a forward-side comparison of the loss), and a live soup train on SmolLM2-135M under NF4 moved every one of them, saving ordinary LoRA adapters that load into a non-streaming model. The reference needs no second copy of the model but is not free in time: DPO walks the layer stack 1.52x as often per step as supervised fine-tuning does, because it adds a reference forward to the policy forward and the gradient-checkpoint recompute. KTO is not reference-free however it is usually described, since it selects its reference exactly the way DPO does; ORPO and SimPO genuinely are. KTO also requires a batch size of 2 or more, because TRL's KL term is degenerate at batch 1, and Soup refuses that when the config is read rather than minutes into a run after the checkpoint has been sharded. No throughput figure is claimed for any preference loss at any size, because none was measured. And the VRAM pre-flight is a sound upper bound for these losses but a loose one, charging the supervised loss's 14 bytes per logit element over twice the rows where TRL reduces preference logits to per-token log-probabilities instead, so on a 4 GB card with a 128k-vocabulary 1B model DPO is allowed at max_length 512 and refused from 768 up even though it would probably fit. That looseness shipped deliberately, because under-predicting is the strictly worse failure on a platform where an overcommit spills silently into host memory instead of raising. What is still out of scope: task must be one of sft, dpo, orpo, simpo and kto, with ipo, bco and the unified task preference dispatcher still refused; backend transformers; text modality; plain LoRA, since DoRA, VeRA and the PiSSA, OLoRA and LoftQ initialisations all read a real base weight that streaming keeps on the meta device; and quantization values other than none and 4bit. A batch_size of auto is refused because the auto-batch probe sizes a resident model, which a streaming run never loads. GRPO and PPO are permanently excluded rather than pending, and their refusal deliberately names no release, because rollouts need generation and generation re-reads the model per token, which destroys the amortisation streaming depends on. Nothing above 8B has been measured on the 4 GB card, so no figure quoted for it speaks for a larger model; sizes from 14B to 72B were later measured on a borrowed 8x H100 box, where the streamed forward is exact against a real resident reference throughout and the exercise found a gradient defect in NF4 above roughly 165 MiB per decoder layer, affecting 32B and larger, which is repaired in v0.73.0 and gated at both affected sizes. The numbers are Windows and WDDM and therefore systematically pessimistic versus Linux. On prior art the claim is deliberately narrow, because a first draft of it was fact-checked and cut. Layer streaming on a small card is well established for inference: AirLLM streams 70B-class models through a 4 GB GPU and its own documentation says layer sharding is not compatible with gradient propagation, and Hugging Face's disk_offload is documented as big-model inference and runs under no_grad. Small-card fine-tuning has been published too: LSP-Offload (arXiv:2406.10181) fine-tunes 1.3B on a 4 GB laptop GPU by compressing the optimisation into a learned sparse subspace rather than by streaming weights. And upstream itself describes layer streaming as Soup's implementation of layer-to-layer streaming of a frozen base (L2L, Pudipeddi et al. 2020). So nobody-has-done-this would be false. The defensible statement is the measured one: up to 8B on a 4 GB card, by streaming the base rather than approximating the optimisation, with the forward pass verified bit-exact against a resident run at the same precision. If the model already fits resident on your card, do not enable streaming. It trades time for memory, and there is nothing to buy when memory is not the constraint.

Question 4

Has layer streaming been verified on hardware other than the maintainer's laptop?

Accepted Answer

Yes, on an 8x H100 80 GB box borrowed for three days in August 2026, and the record is published in full at the repository's benchmarks directory. The reason it mattered is specific. Layer streaming's central claim is that a streamed run computes the same thing an ordinary run computes, and checking that needs a resident reference: the same checkpoint at the same precision, loaded the normal way, so the two can be compared tensor by tensor. On a 4 GB card that reference cannot exist for any model worth streaming, so every published correctness check had run against 3-layer models built from a config, with a hidden size of 32 and an NF4 layer of 0.01 MB. The preprint states this in its own limitations and names it as the most useful experiment missing from the work. Four results came back. First, the streamed forward pass is bit-exact against a matched resident reference, logits compared with torch.equal, at 0.5B, 8B, 14B, 32B and 72B, on real checkpoints rather than fixtures. Read that carefully, because bit-exactness is two independent claims and not one: the forward and the backward are measured separately, and above roughly 165 MiB per NF4 layer they disagreed. Second, peak VRAM is flat in model size, which is the entire point of the feature: 3,397 MiB at 8B, 4,475 MiB at 14B and 4,845 MiB at 32B while the model itself grows fourfold, and 7,411 MiB at 72B. Third, the published laptop headline reproduces on completely different hardware, a different operating system and a much newer software stack: 119.6 tok/s in 3.32 GB on the RTX 3050 (measured on v0.72.2 at 952 MHz, before the NF4 gradient repair; a post-repair row from another RTX 3050 Laptop, taken at a different clock, is recorded, and the two are not directly comparable), against a median 113.00 tok/s in the same 3.32 GB peak on an H100. The server card is if anything slightly slower, and mean GPU utilisation was 54.1%. The explanation first published for that was retracted in August 2026, after an ablation on the original laptop measured the entire host-to-device term at 1.44% of the step; the measurement stands and the explanation does not. Fourth, a streamed model converges indistinguishably from a resident one: five paired runs on disjoint training subsets, scored by Soup's own soup ship against a fixed 300-item held-out set, gave a mean paired difference of 0.0053, roughly 1.6 items out of 300, against a within-arm spread several times larger, and the general-capability leg pointed against the convenient direction with 3 of 5 resident runs coming back DON'T SHIP against 1 of 5 streamed. That is 'no difference is detectable at this resolution', not 'there is no difference'. The exercise also found a defect, which is the honest headline. In NF4, above a boundary bracketed between 163.8 and 171.5 MiB per decoder layer, the backward pass produced silently wrong gradients on every layer but the last few, while the forward stayed bit-exact and the loss matched a resident reference to every digit and the run exited 0. That affects 32B and 72B; 8B sits at 105 MiB per layer and 14B at 132, both below the boundary with margin and both verified exact over a 50-consecutive-backward soak, so nothing this project has published is above it. The cause is buffer aliasing rather than a race, which was established by measurement: a full cuda.synchronize() does not fix it and de-aliasing does. bitsandbytes keeps the packed 4-bit weight and its quantisation state on the autograd context as ordinary attributes instead of using save_for_backward, so gradient checkpointing cannot recompute them, and the reference captured during the forward aliases a streaming buffer that has been refilled with another layer by the time the backward reads it. bf16 was never affected, at 3.9 times the bytes per layer, because it goes through a native operation that does use save_for_backward. The obvious repair, giving every pooled tensor a private copy, was measured and rejected: it costs only about 6% of throughput but takes peak VRAM from 4,220 MiB to 19,720 MiB on a real 32B, which is approximately the whole model, and a repair that is proportional to the model rather than to one layer deletes the reason the feature exists. The shipped repair keeps streamed NF4 weights out of that code path entirely and is gated at 32B and 72B against a control that reproduced the defect in the same process, at 256 of 256 and 320 of 320 gradient tensors exact over five repetitions each, costing about 3% of peak VRAM and about 5% of throughput. It shipped in v0.73.0, so v0.72.0 through v0.72.4 carry the defect at those sizes and anyone who streamed a 32B or larger model in NF4 on one of those should re-run it. The upstream half is filed as bitsandbytes issue 2034 and remains open. One comparison came out of the same session: against DeepSpeed ZeRO-3 with CPU parameter offload, at matched numerics on a single card, layer streaming is 2.93x the throughput in 9.7x less peak VRAM. The right reading is not that streaming beats DeepSpeed, and the record says so explicitly. ZeRO-3 shards across ranks and had no partner to shard to, so it was used outside its intended regime; that regime happens to be layer streaming's home ground. On eight cards ZeRO-3 reached 1,831.7 tok/s using 34 GB on each of eight cards, against 1,077.1 tok/s and 2.9 GB for streaming on one, while one card training the model resident beat all of them at 2,645.4 tok/s. If the model fits on your card, use it resident and skip every clever technique here.

Question 5

Can I run DPO on a GPU that cannot hold the model (preference losses over layer streaming, v0.72.4)?

Accepted Answer

Yes, since Soup CLI v0.72.4. Set 'training.stream_layers: true' and 'task: dpo' in the same soup.yaml, and the frozen base never enters VRAM while DPO trains against it. ORPO, SimPO and KTO work the same way. Before v0.72.4 streaming meant supervised fine-tuning only: task had to be sft, and all four preference losses were refused when the config was read. The accepted list is now exactly five values, sft, dpo, orpo, simpo and kto. Note that ipo, bco and the unified 'task: preference' dispatcher are not in it, so name the loss in task directly, and that grpo and ppo are excluded permanently rather than pending a release, because generation rollouts re-read every layer once per generated token and destroy the amortisation streaming exists to buy. The interesting part is DPO's reference model. DPO scores the policy against a frozen reference, and the obvious implementation constructs a second copy of the model, which doubles the weights on a card that could not hold them once. Soup instead takes the reference from the same streamed base with its LoRA adapters switched off, so policy and reference share one set of weights, one CPU RAM store and one pool of VRAM buffers, and the adapter is the only difference between the two forward passes. The reference therefore needs no second copy of the model's weights (on an untied checkpoint, DPO and KTO add one output-head-sized buffer per step). That was measured with a control rather than asserted, because a passing loss curve cannot detect the failure mode: the streamed layer substitutes base weights through functional_call rather than through the module's own forward, so disabling the adapter being a silent no-op is entirely plausible, and if it were, the reference would be the policy, every log-ratio would be zero and the loss would sit at 0.6931 forever, which reads as slow training. Measured on a 4 GB RTX 3050 Laptop in bf16 with a 365.2M-parameter model, 24 decoder layers, vocabulary 260, sequence length 64 and batch 1: streamed supervised fine-tuning peaked at 89.53 MB, streamed DPO at 81.87 MB (0.914x) with a byte-identical 729.91 MB RAM store and 60.83 MB buffer pool, and the control that forced a real second instance at 812.32 MB, which moved the peak by 730.44 MB against 730.44 MB of weights, exactly one copy. A zero-adapter control measured a policy-versus-reference gap of exactly zero, proving the gap in the real run comes from the adapter and not from some other difference between the two passes. Read the 0.914x as evidence of no second copy, not as a saving: DPO is not cheaper than supervised fine-tuning in general, and that row sits below 1.0 only because the fixture splits its 64 positions into a 32-token prompt and a 32-token completion, so its logits tensor is smaller. The numbers come from a synthetic model, not from a real checkpoint and not from Llama-3.1-8B. Correctness: upstream's CHANGELOG states all four losses are bit-exact against a resident run of the same loss, and the benchmark record shows it for DPO, with a difference of exactly 0.0 (a forward-side comparison of the loss; adapter gradients were checked non-zero, not equal), and DPO's arm ran in float32 on CPU precisely so bit-exact means literally zero rather than bf16 noise. End to end through the released CLI, streaming SmolLM2-135M under NF4, dpo moved 0.6931 to 0.6695, orpo 5.3816 to 5.0559, simpo 5.2033 to 4.8749 and kto 0.5000 to 0.4904, and all four saved ordinary LoRA adapters that load into a non-streaming model. Two things to know before you configure it. First, the reference needs no second copy of the model but is not free in time: DPO walks the layer stack 1.52x as often per step as supervised fine-tuning does, because it adds a reference forward on top of the policy forward and the gradient-checkpoint recompute. Second, KTO is not reference-free however it is usually described, since it picks its reference exactly the way DPO does and gets the same treatment, while ORPO and SimPO genuinely never construct one; KTO additionally requires a batch size of 2 or more, because TRL's KL term is degenerate at batch 1, and Soup refuses that when the config is read rather than minutes into a run after the checkpoint has been sharded (since v0.76.0 for every KTO run, streamed or not). Two honest limits. No throughput figure is claimed for any preference loss at any model size, because none was measured. And the VRAM pre-flight is a sound upper bound for these losses but a loose one: it charges the supervised loss's 14 bytes per logit element over twice the rows, while TRL reduces preference logits to per-token log-probabilities with selective_log_softmax instead of holding a full-vocabulary fp32 upcast, so DPO's entire above-resident cost measured 51.76 MB where the charge for the same shape is roughly 458 MB. In practice, on a 4 GB card with a 128k-vocabulary 1B model, DPO is allowed at max_length 512 and refused from 768 up even though it would probably fit; lower data.max_length if the pre-flight refuses a run you believe fits. That conservatism shipped deliberately, because under-predicting is the strictly worse failure: on Windows an overcommit is not an exception you can catch, since WDDM silently spills into shared host memory and the run completes an order of magnitude slower with no error at all, which means a run completing is not evidence that its configuration fits. The measurement record behind all of this is published in full, including the checks that failed and the figures that were measured and then discarded, in the repository's benchmarks directory, and the layer-streaming work has a preprint under DOI 10.5281/zenodo.21771064.

Question 6

What are 'soup reward synth' and 'soup reward stress' in Soup CLI v0.71.40 and v0.71.41?

Accepted Answer

They are a matched pair (v0.71.40 and v0.71.41) that turns Soup's reward-hacking detector on the reward verifier itself, the thing an RL run trusts most and inspects least. 'soup reward synth -o reward.py' auto-generates a deterministic reward verifier from your own gold outputs (it reads each gold from the 'answer' field unless you pass '--field'): it infers one of four families, auto-detected or forced with --kind, and each is grounded in the golds. 'numeric' extracts the last number, a \boxed{} span or a #### answer and compares exactly or within --tolerance; 'json_schema' induces keys, types and required fields; 'regex' builds positional character classes over equal-length golds; 'tool_call' binds each tool's required and allowed arguments. The emitted .py is self-contained, readable and committable, and it rides the existing load_reward_fn .py path so it adds no new trusted-execution surface: you read, edit, diff and commit it. The moat is a mandatory calibration report: the synthesized verifier is loaded back and run against its own references (it must accept at least 90%) and against auto-generated bad answers (it must reject them), and a degenerate always-accept verifier is refused with exit 2, never silently emitted. '--plan-only' reports the induced spec without writing and '--output-report' persists the calibration JSON. 'soup reward stress --references golds.jsonl' (v0.71.41) is the adversarial half: where synth proves a verifier separates references from friendly perturbations, stress asks the question a reward-hacking model asks at train time, does the verifier pay out for degenerate junk? It feeds six families of degenerate completion scored against the real gold (empty, length-padded, repetition and sentinel-spam, plus two structure-preserving ones added in v0.76.0, wrapped_junk and answer_spray; '--attacks' takes a comma list and '--sentinel GOLD' sets the spam token), so a numeric, tool_call or json_schema verifier still gets a valid target and must reject the garbage, and it reports a per-attack accept-rate table plus an overall gameability verdict tuned by '--max-gameable' and '--threshold'. Since v0.76.0 the built-in 'format' reward, which awards 1.0 to 'a', is reported as gameable. It probes a synthesized .py and a builtin (accuracy, format, verifiable) through the same loader, and it is pure and offline: exit 0 for robust, 2 for gameable, 1 for error. A gold-requiring verifier probed with no --references is a hard error naming the flag, never a false 'robust'. v0.71.40 also made a comma-separated 'training.reward_fn: "accuracy,format"' actually train, resolving it to a reward ensemble (a GRPOTrainer with a list of reward_funcs) which also unlocks the rm_ensemble reward-hack detector, and it fixed a recipe that shipped exactly that form and previously crashed. Nothing in TRL, Unsloth, Axolotl or OpenRLHF synthesizes a reward or tests one for gameability.

Question 7

How does 'soup ship' decide SHIP or DON'T SHIP, and can I commit the evidence (v0.71.38, v0.71.39)?

Accepted Answer

'soup ship' answers one question after a fine-tune, did the model get better or did I break it, as a single binary SHIP or DON'T-SHIP with a one-screen reason. It fuses two legs: leg 1 is that the task metric strictly improved (an eval accuracy, an LLM-judge score, or a swap-debiased pairwise judge win-rate against a 0.5 base), and leg 2 is that no general benchmark regressed past a forgetting threshold (default 0.05 absolute points), so a model that wins the task but breaks general knowledge is refused. v0.71.38 gave leg 2 real teeth. It used to be fifteen trivia prompts scored by case-insensitive substring containment, which credited 'B' for Berlin and '3' for 13 and had zero coverage of tool-calling, JSON validity or safety; it is now an answer-extraction plus boundary-aware scorer over a bundled, offline general suite of eight hand-authored benchmarks shipped in the wheel (mini_mmlu, mini_common_sense, mini_instruction, mini_arithmetic, mini_tool_call for function calling, mini_format_json for JSON validity, mini_safety for refusal rate, and since v0.73.2 mini_over_refusal, which scores the fraction of benign-but-alarming-sounding requests NOT refused, because a model that refuses everything used to read as a monotone safety improvement), each roughly forty items or fewer (24 to 40) so a few wrong answers trip the default threshold instead of being rounded away, all scored offline with no lm-eval and no download. Usage errors moved to exit 3 so exit 2 now means only DON'T-SHIP; since v0.76.0 an unreadable or malformed --evidence file exits 3 too (it was 1). v0.76.0 also re-scaled three of the suites so a strong small model no longer sits at 1.000 (mini_common_sense and mini_arithmetic now have 40 items each and 24 of mini_tool_call's 40 rows were replaced), moved the bundled scorer to revision 5, and makes a --baseline stamped at an older revision warn, because it is on a different scale. v0.77.0 grew mini_mmlu to 40 rows and moved the bundled scorers to revision 7, so a baseline written by v0.76 is not compared silently on the new scale: write it again. v0.77.0 also adds 'soup ship --require-provenance', which checks evidence against the adapter, task and source bytes, suite version and verdict policy it was stamped with (unkeyed hashes that detect drift, not a signature). v0.71.39 closed the evidence loop: 'soup ship --emit-evidence <path>' re-serializes the verdict back into the --evidence input schema so a run's output replays as input; a ShipConfig block under eval.ship in soup.yaml plus 'soup ship --config soup.yaml' lets you commit the gate policy with CLI over config over default precedence; and 'soup ship --push owner/repo#N' posts the verdict as a GitHub PR comment as a best-effort step that never flips the exit code. Emitting evidence stamps a provenance block with an order-insensitive config hash, the base model and a best-effort data hash, and reading evidence back with --config refuses (exit 3) evidence whose config drifted from the committed recipe, while excluding the gate policy from the hash so tuning the threshold never falsely invalidates evidence. 'soup ci init --config soup.yaml' binds the generated PR gate to that committed config, and since v0.73.3 the noise floor is committable there too as 'eval.ship.noise_floor'. That floor, added in v0.73.2 as 'soup ship --noise-floor N', re-runs the base model N times (N from 2 to 10) and refuses to call a delta significant below what the instrument itself can resolve, because greedy decoding is not deterministic on a GPU. v0.73.2 measured it on the leg-1 task axis in '--task-mode metric' only; v0.73.3 measures it in every task mode, scoring the base side N times through the judge in 'judge_score' and judging the base model against itself in 'pairwise', where the expected win rate is 0.5 by construction so the spread is measured rather than inferred. Because those repeats fold in the judge's own sampling noise, that floor is labelled 'decode + judge' on the panel and stamped judge_inclusive in the evidence, so it is never read as a decode-only number. It still sizes an effect rather than calibrating a threshold: n=3, one model, one dataset. That is CI for weights, not prompts: a provenance-bound SHIP gate that renders on every pull request. One honesty note: Soup sends nothing about your runs unless you ask it to. Telemetry was wired in v0.75.0 but is strictly opt-in, off unless SOUP_TELEMETRY=1, with a --no-telemetry option on the root soup command, so it goes before the subcommand (soup --no-telemetry train --config soup.yaml; after the subcommand it is refused), and it is hardware-only: seven fields covering version, command name, Python major.minor, OS, architecture, duration and a locally generated anonymous UUID, never dataset paths or contents, model names, config contents, usernames, local paths, IP addresses or credentials. As shipped it still sends nothing even when opted in, because the bundled project key is a placeholder the sender refuses by name, printing a notice instead of opening a socket.

Question 8

What is 'Data Moat II' in Soup CLI v0.71.36 (semantic dedup, topics, canary, replay)?

Accepted Answer

Data Moat II (v0.71.36) puts a semantic layer over your training data and adds two tools for what a fine-tune forgets and leaks, with zero new dependencies (it reuses transformers from the [train] extra, a mean-pooled all-MiniLM-L6-v2, so no sentence-transformers). 'soup data dedup --semantic -o clean.jsonl' removes near-duplicates over embedding cosine instead of MinHash shingling, catching reworded duplicates MinHash scores as distinct (measured 0.88 to 0.91 cosine on rewordings) while keeping genuinely-distinct-but-similar instructions; flags are --threshold (default 0.8), --field and --embed-model. The honest known limitation ships with it: it is not a paraphrase detector, because measured paraphrase cosines (0.49 to 0.76) overlap with genuinely distinct rows (for example 'Add two numbers' vs 'Multiply two numbers' scores 0.759, higher than the true paraphrase 'reverse a string' / 'invert the order of characters' at 0.491), so no threshold separates them and lowering --threshold to chase paraphrases deletes real training rows; the default 0.8 is deliberately conservative. 'soup data topics <data>' clusters the dataset with k-means over the same embeddings, labels each cluster with c-TF-IDF terms, and prints a coverage table (for example '82% code, 6% math') plus a warning for thin topics; the labels are emergent term clusters, not classification against a fixed taxonomy, and there is no automatic join to an eval-coverage suite. 'soup data canary insert train.jsonl -o canaried.jsonl --count 16 --manifest secrets.json' plants K high-entropy secrets, and after training 'soup data canary check --manifest secrets.json --base ./model --adapter ./lora' ranks each secret's loss against never-inserted controls drawn from the same space (a Secret-Sharer memorization probe); the verdict is a binomial-tail test at alpha 0.05 over the count of memorized canaries, with exit 2 on MAJOR so CI can gate a leak. That count-based verdict replaced an 'any single canary in the bottom 1%' rule that fired MAJOR on a clean model about 15% of the time at K=16 (a CI gate crying wolf one run in seven); the fix dropped the false-MAJOR rate to about 1.2%. 'No exposure' is the sampled-control approximation, not full-space rank enumeration, and the manifest is written 0600 on POSIX. 'soup train --config new_task.yaml --replay old_task.jsonl --replay-ratio 0.1' is continual-learning rehearsal: it interleaves a seeded sample of an old dataset into training so a new task does not erase the old one, where the ratio is the fraction of the final mixed set, rows are interleaved rather than appended, an undersized pool reports the shortfall instead of repeating rows, and validation stays pure new-task; replay v1 is sft/pretrain only and is incompatible with packing/multipack, and on SmolLM2-135M + LoRA it retained the old task 7% better than a no-replay control, the correct direction, but forgetting without it was only about +4%, so the effect size at full fine-tuning or 7B+ is proof-of-mechanism, not yet demonstrated at scale. Data Moat II also fixed the hardware-fit gate, which had refused to train any locally-merged model because the size guesser returned its 7B default for a name with no size marker; local checkpoints are now measured from their safetensors header. The follow-up patch v0.71.37 made every 'pip install soup-cli[extra]' hint use double quotes so it works on Windows cmd.exe, and fixed eval-gate benchmark tasks.

Question 9

How do I fine-tune a model for HIPAA, SOC 2, the EU AI Act or SR 11-7 with Soup CLI?

Accepted Answer

The v0.71.35 compliance pack covers it end to end. Start with 'soup init --template hipaa|soc2|eu-ai-act|sr-11-7'. Be clear on what a template is, because the honest constraint shaped the design: Soup's compliance controls are CLI flags and commands, not config keys (audit_log, bom, attest, repro_receipt, annex_xi, track_energy, pii and decontaminate have zero matches in the config schema), so a template cannot 'pre-wire audit-log on' as YAML. Each one is instead a valid, immediately trainable config on a license-clean Apache-2.0 base, plus header comments naming that regime's exact commands: PII flagging and air-gap for HIPAA, BOM/attest/sign for SOC 2, Annex XI plus energy tracking for the EU AI Act, repro-receipt plus diagnose and ship for SR 11-7. Built-in templates went from 17 to 21. The common path is then: 'soup data pii' (flags rows that match email, phone, SSN or card-number patterns; it does not redact) and 'soup data decontaminate --benchmark-file ' (drops rows that overlap a benchmark corpus you supply; Soup bundles none) to check the data; 'soup train --repro-receipt receipt.json' (adding '--annex-xi annex_xi.md --track-energy --energy-country DEU --energy-out energy.json' for the EU AI Act); 'soup registry push'; 'soup bom emit --format both' for CycloneDX plus SPDX and 'soup attest emit --sign ed25519' for in-toto plus SLSA-3; 'soup adapters scan/sign/verify'; 'soup airgap-bundle' if you need to cross an air gap; then 'soup card -o MODELCARD.md' to publish. The audit log records every command automatically ('soup audit-log tail'). Finally 'soup ci init' writes .github/workflows/soup-gate.yml, a pull-request gate chaining 'soup data validate', then 'soup expect', then 'soup ship --evidence', where exit 2 blocks the merge in each step and any other non-zero exit (a usage or configuration error) also fails the job and is labelled as one. Since v0.77.0 the generated step passes '--min-valid-fraction 1.0', so 'soup data validate' there exits 2 when any row fails to convert (edit the fraction in the workflow to allow drops); only a workflow generated by v0.77.0 passes it, and a workflow written by v0.76.1 or earlier keeps its old step, which exits 0 while any row is valid, until you regenerate it with 'soup ci init --force'.

Question 10

What is 'soup card' and 'soup ci init' in Soup CLI v0.71.35?

Accepted Answer

'soup card -o MODELCARD.md' (v0.71.35) turns a Local Model Registry entry into a publishable, provenance-carrying Hugging Face model card: base model, the real training config, an eval scorecard joined from the tracker, config and data sha256 hashes, lineage (ancestors), and a table of every registered artifact. Adapter versus full model is inferred from the registered artifacts and falls back to the training config's LoRA rank, with Spectrum ('unfrozen_parameters') and LISA ('lisa_enabled') full fine-tunes correctly treated as dense, so the card sets the right 'library_name' and never misreports the model type. That detail was found by a live smoke, not by tests: a real LoRA run with no attached artifacts rendered 'Type | Full model' and 'library_name: transformers', a false claim in a provenance document that 90 green tests had missed. 'soup push --model ./out --repo you/m --card ' renders the same card and uploads it as README.md, overriding the auto-generated one; a bad ref fails fast before any network call and it is Hugging Face only (it warns and ignores on other hubs). 'soup ci init [--data d.jsonl --suite s.yaml --evidence ev.json] [--branch main --python 3.11] [--force]' writes .github/workflows/soup-gate.yml, a fine-tuning CI gate that runs 'soup data validate' for dataset format compliance, then 'soup expect' for PII, token-length and refusal expectations, then 'soup ship --evidence', where exit 2 blocks the merge in each step and any other non-zero exit (a usage or configuration error) also fails the job and is labelled as one (since v0.77.0 the generated step passes '--min-valid-fraction 1.0', so 'soup data validate' there exits 2 when any row fails to convert; edit the fraction in the workflow to allow drops, and note that only a workflow generated by v0.77.0 passes it: a workflow written by v0.76.1 or earlier keeps its old step, which exits 0 while any row is valid, until you regenerate it with 'soup ci init --force'). Every interpolated path is validated to stay under the repo root and shell-quoted (a '; rm -rf /' in a path is quoted as one token), the branch and Python version are regex-gated so they cannot break out of their YAML context, and the write is atomic, symlink-rejecting, and refuses to clobber an existing workflow without --force.

Question 11

What is 'soup draft', and does training a speculative-decoding draft actually make serving faster?

Accepted Answer

'soup draft' (v0.71.33) trains and, above all, MEASURES a speculative-decoding draft, and the honest answer to whether it makes serving faster is: measure it, because on the pair we validated it did not. 'soup draft measure --target --draft --prompts p.jsonl' reports a draft's acceptance rate (the fraction of the target's own greedy tokens the draft would have proposed correctly, teacher-forced argmax agreement, the metric the Medusa and EAGLE papers report) plus real plain-versus-assisted throughput measured on your box; there is no single acceptance rate where speculative decoding pays (the one pair upstream measured at scale scored 81% acceptance and ran at 0.48x), so since v0.76.0 it also times the draft on its own and reports the break-even acceptance rate at the --num-assistant-tokens in use and a modelled best draft length ('--sweep-k 1,2,3,5,8' measures assisted throughput at each length; the model assumes independent acceptance and excludes framework overhead), and a draft no faster than its target is reported as no acceptance rate paying; '--min-acceptance 0.6' still exits 2 below the floor so CI can gate on it (exit 0 = ok, 2 = below floor, 1 = error). 'soup draft distill --target --draft-base --data d.jsonl -o draft/' distils your target into a tiny base via logit KD through the existing 'task: distill' trainer and emits a dense model, because a PEFT adapter directory cannot be loaded as an assistant_model; flags include --steps, --device, --force and --plan-only. 'soup draft list' shows local drafts, and a registry at ~/.soup/drafts.json is consulted by 'soup serve --auto-spec' BEFORE the built-in pairing table, so a draft you trained yourself is picked up automatically. Draft and target must share a tokenizer and a mismatch is refused up front, because speculative decoding proposes draft token ids into the target's vocabulary and a mismatched pair silently produces garbage rather than failing. The measured result, which is the feature: on SmolLM2-360M-Instruct with a SmolLM2-135M-Instruct draft, the stock draft already scored 69.3% acceptance and distilling it moved that to 69.7% after 2 epochs and back to 69.3% after 10, no gain beyond noise, because a small same-family draft is already near its capacity ceiling for agreeing with the target and logit KD cannot buy capacity it does not have; assisted decoding measured 0.55 to 0.64x, a net slowdown, since the draft's forward pass costs more than the tokens it saves at that size. The 'faster serving' pitch was therefore withdrawn rather than shipped, and 'soup draft measure' is what tells you so before you ship. Whether distillation pays off on a larger or genuinely diverged pair is unproven on a 4 GB box; cross-tokenizer drafts were deferred at the time and shipped in v0.74.0, routed through Wasserstein-aligned logits.

Question 12

What is 'soup adapters arithmetic' (LoRA task arithmetic) and LISA in Soup CLI v0.71.34?

Accepted Answer

'soup adapters arithmetic "coder + 0.5*math - toxic" --adapter coder=./coder-lora --adapter math=./math-lora --adapter toxic=./toxic-lora -o ./blended' (v0.71.34) applies task arithmetic (arXiv:2212.04089) to LoRA deltas: add to blend two skills, scale to dial one down, and, the differentiator, negate to subtract one. The output is a single loadable adapter (exit 0 = ok, 1 = refusal). The coefficient math is the point: a LoRA does not store its delta directly but two factors whose product is the effective weight change (delta W = B @ A), so scaling both factors by c scales the delta by c squared, which would make '- toxic' square to +1 and become a no-op instead of a removal. Soup splits the coefficient as the square root of its absolute value across the two factors and carries the sign, so the delta scales linearly (verified live on two real rank-8 adapters: the ratio of the norms for 2*a versus a is exactly 2.000). That exactness holds on the self (diagonal) term, so scaling or negating a single adapter is exact, while a multi-adapter sum also carries cross-terms this element-wise combine does not cancel; and the mechanism is what is proven (the delta really negates), not the behavioural outcome, since whether subtracting a toxicity adapter measurably reduces toxicity on a real safety eval is not yet benchmarked. Guards: a different base model is refused unless --allow-cross-base, a FAIL-scanned input is refused by the backdoor-scan gate unless --allow-unscanned, and paths are cwd-contained and symlink-rejecting. The expression parser is hand-written with no eval, so an adapter name can never become code. v0.72.0 removed the one real limitation: mixed ranks used to be refused with a 'harmonize rank' message, and they are now handled exactly. Stacking the A factors and the scaled B factors of the inputs produces a combined adapter whose delta reproduces the sum of the individual deltas by construction, with no approximation, and the new '--rank N' flag then truncates that result with an SVD when you want a fixed output rank rather than the concatenated one. Ranks are no longer a reason to refuse; genuinely incompatible layer shapes still are.

Question 13

What is LISA in Soup CLI (v0.71.34)?

Accepted Answer

LISA (Layerwise Importance Sampled AdamW, arXiv:2403.17919) is the other half of v0.71.34 and reaches for full-fine-tuning quality without a full fine-tune's memory: where Spectrum picks the layers once, LISA re-samples a small random set of decoder layers every N steps and freezes the rest, with the input embeddings, LM head and final norm always trainable. Because only a handful of layers train at any moment and their optimizer state is cleared when re-frozen, peak optimizer memory is roughly embeddings + head + lisa_num_layers, while every layer still gets updated over the run. Read that arithmetic carefully, because it is true and it is not a saving over LoRA: measured on an H100 at 3B and 8B, LISA beats full fine-tuning on held-out loss at both learning rates, and it costs 1.22x LoRA's memory at 3B and 1.51x at 8B, with the gap widening because the embeddings, the LM head and the final norm stay trainable through every interval and are 70.7% of everything LISA trains at 8B. Both LoRA rows in that comparison were measured before v0.74.0 fixed a frozen base being loaded in fp32, so a LoRA run today needs less memory than they show; no repeat of the comparison is recorded. Stated positively: LISA trains an 8B on one 80 GB card where full fine-tuning needs roughly 120 GB and cannot run at all. Enable it with 'training.lisa_enabled: true' plus 'lisa_num_layers', 'lisa_interval_steps' and 'lisa_reset_optimizer' on a task: sft or, since v0.74.0, task: pretrain run, with transformers, text and quantization: none; it is mutually exclusive with LoRA features, freeze_layers/freeze_ratio and Spectrum's unfrozen_parameters, since each independently decides what trains. Live on a 4 GB GPU for small models.

Question 14

Does 'soup export --format gguf' work on Windows?

Accepted Answer

Yes, as of v0.71.35, and it was validated end to end on Windows for the first time: llama.cpp built CPU-only with VS2022 BuildTools and cmake, SmolLM2-135M exported to q4_0 (92 MB), q4_k_m (105 MB), q8_0 (145 MB) and f16 (271 MB), then 'soup deploy ollama', then live inference. Doing that validation surfaced four real bugs, each of which independently broke the path, and which 361 green export and ollama tests had not caught. First, 'soup export --format gguf' cloned llama.cpp into your current directory: SOUP_DIR is the bare name '.soup' but the lookup used it relatively instead of anchoring to the home directory like the rest of the codebase, so the canonical ~/.soup/llama.cpp was never found and a fresh ~200 MB checkout was dropped into whatever directory you ran from. Second, and worst, the first GGUF export downgraded your PyTorch and broke CUDA: the auto-clone ran 'pip install -r /requirements.txt' into your interpreter, and llama.cpp pins torch~=2.2.1 against the CPU wheel index, so torch 2.5.1+cu became 2.2.2+cpu and transformers 4.57 became 4.46, meaning a user's first GGUF export silently destroyed their training setup; Soup now installs only the convert script's extra dependencies (gguf, sentencepiece, protobuf), unpinned, never touching torch, and non-fatally. Third, a correctly built llama.cpp was 'not found' on Windows because MSVC, like Xcode, is a multi-config generator and emits build/bin/Release/llama-quantize.exe, while only the flat single-config layout was searched. Fourth, 'soup deploy ollama' failed on a relative GGUF path with 'pull model manifest: file does not exist', because Ollama resolves FROM against the Modelfile's directory and Soup writes the Modelfile to a temp dir; the Modelfile now emits an absolute path. This closes the CPU-validatable half of the long-standing GGUF-on-Windows issue; the CUDA half remained open at the time, and the AWQ/GPTQ half is moot: 'soup export --format awq' and '--format gptq' were deprecated in v0.76.0 and removed in v0.77.0, because both upstream projects are archived. Since v0.77.0 'soup export --format gguf' also refuses, before cloning anything, an architecture the pinned llama.cpp converter (b5270) cannot convert, such as Qwen3.5, and names '--llama-cpp '.

Question 15

Can Soup CLI fine-tune Whisper (ASR / speech-to-text) models?

Accepted Answer

Yes. As of v0.71.32, 'soup train' with 'task: asr' fine-tunes OpenAI Whisper speech-recognition models on your own audio, locally. Data is plain JSONL rows of {"audio": "clip.wav", "text": "the transcript"} with 'data.format: asr' and a containment-checked 'data.audio_dir'; the trainer wraps Hugging Face Seq2SeqTrainer + WhisperProcessor (clips become 16 kHz mono log-mel input features, transcripts become the decoder labels). 'training.asr_lora: true' trains LoRA on the q/v projections instead of a full fine-tune, so whisper-tiny (39M) and whisper-base (74M) train on a 4 GB GPU; 'training.asr_language' and 'training.asr_task' (transcribe or translate) pin the decoder prefix and persist to an 'asr_generation.json' sidecar that inference restores automatically. 'soup infer --task asr --model <whisper-or-adapter> --input eval.jsonl --output preds.jsonl' transcribes a JSONL of clips and, when references are present, reports per-row and corpus WER/CER via a pure-Python metrics module with no new dependency; word accuracy (1 - WER) plugs into 'soup ship' as a higher-is-better task metric. Recipes: 'whisper-tiny-asr' and 'whisper-base-asr' (live-validated on a 4 GB RTX 3050: WER 1.000 to 0.000 on a memorization smoke at 0.4 of 4 GB) plus 'whisper-large-v3-asr' (parse-tested, needs 16 GB+). Audio decodes only through a hardened loader (soundfile pre-probe, symlink rejection, O_NOFOLLOW, byte caps); a non-Whisper base or an mlx/unsloth backend is rejected with a friendly error before any download.

Question 16

What is the judge-in-the-loop suite in Soup CLI v0.71.31 (Online DPO, best-of-N, Evol-Instruct, soup ship pairwise)?

Accepted Answer

The judge-in-the-loop suite (v0.71.31) puts an LLM judge in the loop across the whole post-training workflow as four integrated commands sharing one swap-debiased pairwise-judge core, and no competitor (Unsloth, Axolotl, LLaMA-Factory, OpenPipe) ships it as an integrated CLI suite. 'soup train with task: online_dpo' trains on-policy against a judge: each step samples two completions per prompt and a pairwise judge (or a reward model) names the winner 'chosen' and the loser 'rejected', wrapping TRL's OnlineDPOTrainer (config online_dpo_judge or reward_model, exactly one of the two; online_dpo_loss_type sigmoid or ipo; online_dpo_max_new_tokens; beta reuses dpo_beta; transformers and text only). 'soup data best-of-n --base --prompts p.jsonl --n 8 --judge -o sft.jsonl [--emit-pairs dpo.jsonl]' is best-of-N rejection sampling (BOND-lite): sample N completions locally, a judge scores each one pointwise, the winner becomes an SFT row with provenance and, with --emit-pairs, winner-versus-loser DPO pairs. 'soup data evolve --input seeds.jsonl --provider ollama|vllm --model --strategy depth|breadth --rounds N -o out.jsonl' is Evol-Instruct (WizardLM) instruction evolution that grows instruction diversity, completing the synthetic-data suite (Magpie, Forge, Persona, evolve). And 'soup ship --task-mode pairwise --judge-model ' adds a third task-win mode to the SHIP or DON'T-SHIP verdict: a true pairwise judge win-rate where the judge picks base versus tuned per prompt (swap-debiased, a win counts only when the (A,B) and (B,A) orders agree), the base is a 0.5 coin-flip and the tuned model wins only if its win-rate exceeds 0.5, fused with the catastrophic-forgetting gate and CI exit codes (0 = SHIP, 2 = DON'T SHIP, 1 = error). It is honest about scale: the training claim is proof-of-mechanism only, validated on SmolLM2-135M with a synthetic length-preferring judge on CPU, not a production RLHF claim (community scale ask tracked in issue #286). On the supported trl range (0.29 up to, but not including, 1.0) it uses TRL's pairwise-judge path with Soup's swap-debiased judge; the code also carries a pointwise reward-function adapter for trl 1.x, which is outside the declared range. Judge and provider URLs are SSRF-validated, dataset paths are cwd-contained with symlink rejection and atomic writes, and untrusted model code defaults to trust_remote_code off. It adds the online-dpo-smollm2-135m recipe.

Question 17

What is PRM-guided GRPO in Soup CLI v0.71.30?

Accepted Answer

PRM-guided GRPO (v0.71.30) lets a trained Process Reward Model drive GRPO reinforcement learning, the o1-era process-supervision signal, and no OSS fine-tuning CLI ships this. 'soup train with task: grpo' with training.prm_reward set to a PRM directory or Hugging Face id (from 'soup train with task: prm') and training.prm_aggregate set to min, prod or last scores each reasoning step of a generated answer and folds the per-step scores into one reward that GRPO optimizes, replacing reward_fn; the default aggregation 'min' is weakest-link and the safe choice, and it is gated to grpo, transformers and text. v0.71.30 also bundles three ready-to-run toy rollout environments (soup_cli.envs.calculator, retrieval_qa and guess_number) so the GRPO openenv rollout path works with no external setup, with the recipes grpo-env-calculator, grpo-env-retrieval-qa and grpo-env-guess-number. It is proof-of-mechanism on SmolLM2-135M with a tiny synthetic PRM and synthetic reward, not a production reward-model claim (scale ask tracked in issue #286).

Question 18

What is 'soup shrink' in Soup CLI v0.71.29, and how does depth pruning work?

Accepted Answer

'soup shrink --model [--drop-ratio 0.25 | --drop-layers N] --calib calib.jsonl [--heal heal.jsonl --heal-steps 200] [--tolerance 0.10] [-o shrunk] [--device cpu] [--attach-to-registry ] [--plan-only]' (v0.71.29) makes a model permanently smaller and faster by removing its least-useful decoder layers, optionally healing the damage by distillation, and printing a single SHIP / DON'T-SHIP perplexity verdict. It implements 'The Unreasonable Ineffectiveness of the Deeper Layers' (Gromov et al., arXiv:2403.17887): over a calibration set it ranks every contiguous block of decoder layers by the mean per-token angular distance the residual stream travels from the block's input to its output, drops the least-important block (the first and last decoder layers are always protected), reloads the sliced model so surviving layers re-index cleanly, and with '--heal' distills the full-depth original into the pruned student via an isolated LoRA logit-distillation 'soup train' subprocess whose adapter is then fused back — so the shipped artifact stays a single dense smaller model, not a base plus adapter. The verdict SHIPs only if the perplexity ratio (final / original) stays within '--tolerance' (default 10%), else DON'T SHIP; exit codes are 0 = SHIP, 2 = DON'T SHIP, 1 = error, and '--plan-only' prints the layer-importance table and the chosen block without writing anything. The arch allowlist v1 is Llama / Qwen / SmolLM (checked twice). It is validated live on SmolLM2-135M on a single RTX 3050: drop 25% took it from 30 to 22 layers (~21% of params) at perplexity x2.98 unhealed, while drop-4 plus a CPU heal recovered perplexity to x1.35. No fine-tuning CLI (Unsloth, Axolotl, LLaMA-Factory) ships one-command importance-ranked depth pruning with a distill-heal and a binary perplexity verdict. Security: --calib, --heal, --output-dir and every derived write path stay under cwd with realpath + commonpath + O_NOFOLLOW + symlink rejection re-validated right before each write (TOCTOU defence, including after the heal), the heal subprocess is an argv list with a timeout and a schema-validated config, subprocess output is control-char-stripped, input files are capped at 64 MiB / 10,000 calib rows, and --model defaults trust_remote_code off.

Question 19

Does Soup CLI have an MCP server, and what does 'soup mcp serve' do?

Accepted Answer

Yes. 'soup mcp serve [--allow-mutating]' (v0.71.28) is a Model Context Protocol server that lets you drive Soup from any MCP client (Claude Code, Cursor, Cline, Continue) over stdio by default (or a bearer-gated sse or http listener, described below), so your coding agent can inspect data, search recipes, read runs and give ship verdicts without leaving the chat. Since v0.73.3 it exposes 18 tools: 14 read-only ones that each map to a Soup command and return JSON (advise, data_inspect, data_validate, data_score, data_doctor, recipes_search, recipes_show, runs_list, runs_show, registry_list, registry_show, profile, diagnose_evidence, ship_evidence); 2 planning tools (train_start, export) that are always listed but refuse to run unless you pass '--allow-mutating', and even then only render the exact command that would run; and 2 executing tools (train_execute, export_execute) behind '--allow-execute', which was a reserved gate in v0.73.2 and opens in v0.73.3. An executing tool accepts only a confirmation_token: the token is server-generated, random, single-use, expires in five minutes and is bound to both the plan and the execution kind, so no command, argv, shell string or client-supplied environment ever reaches the process. The validated config is snapshotted at plan time and the run executes from that copy, protected inputs are revalidated by a content hash that walks a directory tree rather than by timestamp and size, the child is spawned with shell=False and stdin closed with output redirected to a log under .soup/mcp-runs, the token is consumed before the spawn so a failed spawn needs a fresh plan, only one execution runs at a time gated on a persisted run whose process is still alive so a restarted server cannot double-book a GPU, and the run goes through the normal experiment tracker so 'soup runs' sees what MCP started. '--allow-mutating' on its own can never spawn a process. One caveat for anyone auditing this against the binary: the shipped '--help' text for '--allow-execute' was not updated by the feature and still describes the pre-v0.73.3 reserved gate. Stdio is the default and opens no port; v0.74.0 added two network transports, '--transport sse' and '--transport http', each requiring an 'Authorization: Bearer' header compared in constant time with no opt-out, with the SDK's DNS-rebinding protection on (421 on a foreign Host, 403 on a foreign Origin) because a page the operator merely visits sends no auth header and its request still reaches the port, and with warnings on an off-loopback or wildcard bind. '--allow-execute' is refused with either network transport, in the command and again in the app factory, because behind a listener a leaked token would mean process execution rather than plan disclosure; '--host', '--port' and '--auth-token' are refused under stdio rather than silently ignored. On stdio, stdout is reserved for the JSON-RPC channel (all human text goes to stderr), every path argument re-enters cwd-containment plus symlink rejection, output is control-char sanitized so a malicious dataset string cannot smuggle terminal escapes into the client, errors are path-free, and string (<= 4096 chars) / JSON (<= 16 MiB) / dataset (<= 1 GiB) / int bounds are enforced. It installs behind a new '[mcp]' extra ('pip install "soup-cli[mcp]"', dependency mcp>=1.10.0,<3 since v0.74.0, which bridges both SDK majors by probing the server constructor rather than reading a version string) that is lazy-imported so the core CLI stays PyTorch-free and SDK-free. A client connects with { "mcpServers": { "soup": { "command": "soup", "args": ["mcp", "serve"] } } }. The server exposes MCP Tools only — no Resources or Prompts. A crash between spawning a training job and recording its process id used to let a restart double-book a second job, so an unresolved launch now counts as active and 'soup mcp runs reconcile --expunge-launching' recovers capacity from stale rows, refusing the whole operation if any candidate records a process that is still alive.

Question 20

What is the Fine-tune Doctor (soup data doctor / soup data lint) in Soup CLI v0.71.27?

Accepted Answer

v0.71.27 'Fine-tune Doctor' is a pure-CPU, zero-GPU pre-flight that kills the top silent fine-tune failures before a single training step — something no competitor (Unsloth, Axolotl, LLaMA-Factory) ships. 'soup data doctor --model ' runs 8 chat-template compatibility checks against the real tokenizer: chat_template present, template renders cleanly, {% generation %} markers present, eos_in_labels (the number-one 'model never stops generating' bug — every assistant turn's trained span must actually contain an EOS/EOT token, checked on every turn not just the last), bos_duplication (template and tokenizer both prepending BOS), system_role support (Mistral-style templates reject a leading system turn), unknown_roles, and truncation_risk (p95 rendered length vs max_length). It uses the same OK/MINOR/MAJOR taxonomy as 'soup diagnose' with exit 0 on OK/MINOR and exit 2 on MAJOR, and '--show-mask N' colours each token trained-versus-masked through the REAL collator path (answer-only / per-message train-field / RAFT span-mask), not a reimplementation, so an assistant-mask bug is visible instantly. 'soup data lint ' is a preference-data linter for dpo/orpo/simpo/ipo/bco/kto that flags length_bias (chosen systematically longer than rejected, the number-one silent DPO degradation, reported as a Cohen's d effect size), label_imbalance (KTO desirable:undesirable ratio), near_duplicates (MinHash/LSH, reusing the dedup kernel), identical_pairs (chosen == rejected, zero preference signal), and prompt_leak (prompt echoed verbatim in the completion); pass '--model' for exact token-length bias instead of word count.

Question 21

What is 'soup spectrum scan' and how does Spectrum targeted training work?

Accepted Answer

'soup spectrum scan --model --top-percent 50 [--modules mlp,attn|all] [--output patch.yaml]' (v0.71.23) is native Spectrum targeted training. It streams a model's safetensors shards one tensor at a time — no model load, so peak RAM is the largest single weight matrix and you can scan even a 70B on a CPU box — computes a singular-value SNR per weight matrix with a Marchenko-Pastur noise threshold (arXiv:2406.06623), ranks layers within each module-type group, and prints the top --top-percent as a ready-to-paste 'training.unfrozen_parameters' YAML block. The SNR kernel is pure-numpy and transpose-invariant, so GPT-2 Conv1D weights (c_attn/c_fc/c_proj) are recognised alongside Llama-style names; results cache at '~/.soup/spectrum/.json'. The new schema field 'training.unfrozen_parameters: list[str]' takes regex patterns of parameter names to keep trainable: the SFT trainer freezes every parameter then unfreezes the matched set (a full fine-tune of a subset of layers, LoRA off). It requires task=sft, backend=transformers, modality=text, quantization=none and is mutually exclusive with LoRA features / freeze_layers / freeze_ratio / train_router_only / expand_layers. Patterns are ReDoS-validated (nested-unbounded-quantifier reject, 50k count cap, 512-char cap); Hub downloads route through the SSRF-hardened namespace-pinned loader and matrices above a 2^31-element SVD cap are skipped.

Question 22

How does 'soup train --reward-hack-detector' detect reward hacking in GRPO?

Accepted Answer

'soup train --reward-hack-detector info_rm|rm_ensemble [--reward-hack-halt]' (v0.70.0) is an early-warning system for reward hacking in GRPO runs (a 'task: ppo' run refuses it since v0.76.0). Two detectors: 'info_rm' tracks the InfoRM Cluster-Separation Index (Wang et al. 2024, arXiv 2402.09345) — a calibrated metric on reward-model embeddings that drops when the policy collapses onto a degenerate reward-maximizing subspace; 'rm_ensemble' tracks the mean pairwise variance across an RM ensemble (cap 32) — when ensemble members disagree, the policy is exploiting one of them. Math kernels 'compute_cluster_separation', 'compute_rm_ensemble_divergence', and 'classify_hack_signal' are LIVE with OK/WARN/HACK bands at 0.10 / 0.30 relative drop from the baseline window. '--reward-hack-halt' stops training when the verdict reaches HACK. Cross-validator: the config accepts task grpo or ppo only (and 'soup train --help' still says GRPO/PPO), halt=True requires detector, rejects mlx backend; but since v0.76.0 'task: ppo' refuses the detector at trainer setup, before the model loads, because the trl PPO trainer takes no reward functions and the signal buffer was never fed, so use 'task: grpo'. Composes with v0.34 'soup why' for anomaly explanation. LIVE as of v0.71.11 — the GRPO TrainerCallback now reads per-step rewards via a thread-safe capture buffer, classifies OK/WARN/HACK, logs the verdict, and halts on HACK.

Question 23

What is closed-loop reward-hacking auto-mitigation in Soup CLI v0.71.26?

Accepted Answer

'soup train --reward-hack-mitigation off|log_only|kl_control|pid_lagrangian' (config field 'training.reward_hack_mitigation', v0.71.26) makes a GRPO trainer DETECT reward hacking mid-run and SELF-CORRECT instead of only halting. No open-source RLHF library (TRL, Unsloth, Axolotl, OpenRLHF, verl) closes the loop from detection to automatic correction to continue — that is the whitespace it fills. Four modes: 'log_only' streams a per-step mitigation_log.jsonl (drop_pct, OK/WARN/HACK verdict, reward mean/std, completion-length trend, n-gram repetition) and provably never touches training dynamics; 'kl_control' is a reversible bang-bang controller with hysteresis that, when a multi-signal vote (InfoRM cluster-separation or RM-ensemble divergence plus length-trend and repetition) trips for a dwell window, raises the KL coefficient beta (clamped to a positive floor and ceiling, never crossing zero, written to both trainer.beta and trainer.args.beta for stock and variant GRPO) and relaxes it once the signal recovers; 'pid_lagrangian' replaces bang-bang with a PID-Lagrangian controller (Stooke et al. 2020) that holds the hacking signal at a target with integral anti-windup, plus an escalation ladder (raise KL, then roll back to the last-good RL checkpoint, then early-stop with a plain-English give-up explanation via 'soup why'). Anti-gaming hardening adds per-signal EMA/median smoothing, conservative-on-disagreement voting, a reward-distribution-drift guard, and optional bounded reward shaping on the gamed proxy. It ships as proof-of-mechanism ONLY, validated on SmolLM2-135M plus a synthetic length-hacking task on a single RTX 3050 (all four modes live including a real mid-run rollback); since v0.76.0 'task: ppo' refuses 'reward_hack_mitigation' (and the detector and the echo-trap flags) before the model loads, because the trl PPO trainer cannot feed the signal buffer, so the mitigation runs on 'task: grpo' only, and scale validation on 7B+ with real reward models is an open community question tracked in issue #286. +184 tests in that release; the suite now spans 1070 test files.

Question 24

What is 'training.uld_strategy' (Universal Logit Distillation) in Soup CLI v0.70?

Accepted Answer

'training.uld_strategy' in soup.yaml selects a Universal Logit Distillation loss (Boizard et al. 2024, arXiv 2402.12030) on 'task: distill', run with 'soup train --config soup.yaml'. There are three strategies and only one of them is cross-tokenizer, which matters because picking the wrong one used to train silently on the wrong text. 'wasserstein_aligned' is the cross-tokenizer strategy: it re-tokenizes and aligns decoded character spans, so Llama to Mistral, or GPT-2 BPE to Llama SentencePiece, is a real comparison. 'wasserstein' (a 1-D Wasserstein distance over sorted teacher / student logits, no alignment, cheap) and 'topk_align' (top-K teacher logits matched by a BPE-overlap heuristic, plus 'training.uld_top_k: N') both forward the student's own token ids to the teacher unchanged, so they are correct ONLY when the two tokenizers are interchangeable, such as two sizes in one family. Until v0.75.0 they clamped a mismatched id into the teacher's vocabulary range instead, which does not translate a token between vocabularies, so the teacher was conditioned on the wrong text while the loss stayed finite and plausible; since v0.75.0 both refuse a non-interchangeable pair at setup and name 'wasserstein_aligned' instead. v0.75.0 also made the ULD loss respect the response-only label mask and the causal shift, which it had ignored, so under the default 'train_on_responses_only' it had been optimising prompt tokens too. _MAX_VOCAB_SIZE=262144 covers multilingual SentencePiece + GPT-OSS 200K vocabularies. All three are gated to task='distill' and reject the mlx backend. Live as of v0.71.11.

Question 25

How does 'training.minillm_enabled' stabilize reverse-KL distillation?

Accepted Answer

The config keys 'training.minillm_enabled: true' plus 'minillm_teacher_mix_ratio: 0.3', 'minillm_length_normalize: true', 'minillm_pretrain_anchor_weight: 0.1' and 'minillm_pretrain_anchor_path: pre.jsonl' (v0.70.0) is on-policy reverse-KL distillation (Gu et al. 2024, arXiv 2306.08543) with all three §3 stability tricks bundled — teacher-mixed sampling (mix ratio of teacher samples into the on-policy rollout), length normalisation (per-token KL averaged), and pretrain-loss anchor (regularise toward an anchor distribution at weight α). Cross-validators reject silent no-ops: anchor_weight=0 with anchor_path set, or anchor_weight > 0 with path None. Gated to task='distill'. LIVE as of v0.71.11 — the teacher-mixed, length-normalised reverse-KL term plus the optional pretrain anchor now train end-to-end (the anchor reader is cwd-contained + symlink-rejecting).

Question 26

What does 'training.rl_checkpoint_save_every_steps' fix that TorchTune punts on?

Accepted Answer

The config keys 'training.rl_checkpoint_save_every_steps: N' plus 'rl_checkpoint_keep_last' and 'rl_checkpoint_include_optimizer' (v0.70.0) adds mid-epoch checkpointing to PPO and GRPO — a feature TorchTune explicitly punts (their docs link out to 'restart the epoch on crash'). save_every_steps ∈ [1, 10M], keep_last ∈ [1, 100] (oldest pruned). The optimizer state is an optional inclusion. 'rl_checkpoint_include_ref_model' and 'rl_checkpoint_include_rollout_buffer' were accepted too, but no save wrote that state (the manifests claimed it until v0.77.0, #1980), and since v0.77.0 setting either to true refuses the load with no warning release in between; an explicit false still loads. At v0.77.0 Soup restores these checkpoints automatically in one place only, the rollback rung of the 'pid_lagrangian' reward-hack mitigation ('training.reward_hack_rollback: true', which requires this cadence to be set). The v0.32 loss-spike recovery writes a hint file and does not read them back. LIVE as of v0.71.11 — it writes a real adapter + optimizer state + JSON manifest every N steps and prunes to 'rl_checkpoint_keep_last'. All of these are config keys under 'training.', not CLI flags on 'soup train'.

Question 27

What is 'soup iterative-dpo' and how does it differ from a single DPO run?

Accepted Answer

'soup iterative-dpo --base-model --reward-model --prompts --output-dir --rounds N --pairs-per-round N [--plan-only]' (v0.70.0) drives the iterative-DPO loop: sample from the current policy, score with the reward model, build new preference pairs, retrain DPO, repeat for N rounds. Frozen IterativeDPOPlan with a consecutive-round_index invariant and canonical per-round artifacts ('./out/round-00/pairs.jsonl', './out/round-00/adapter', numbered from zero). There is no resume: the runner does not skip a round whose adapter already exists, so a crashed run starts again from round-00. '--plan-only' renders the validated plan and exits 0; the live runner shipped in v0.71.11 — each round samples completions from the previous round's adapter, then trains a fresh LoRA from the base on that round's harvested pairs.

Question 28

How does 'training.echo_trap_enabled' detect multi-turn agent degeneration?

Accepted Answer

The config keys 'training.echo_trap_enabled: true' plus 'echo_trap_threshold: 0.6' and 'echo_trap_halt: true' (v0.70.0) is the RAGEN-style trajectory-degeneration detector for multi-turn agent RL (Zhu et al. 2025, arXiv 2504.14437). Pure-Python n-gram repetition rate per trajectory + a batch mean — when an agent's rollout collapses into 'echoing itself' (the same n-gram pattern appearing repeatedly within and across turns), this catches it before the reward model rewards the degenerate policy. OK / WARN / TRAP bands at 0.30 / 0.60. DoS caps _MAX_NGRAM_N=32, _MAX_TRAJECTORY_TOKENS=1M, _MAX_BATCH_TRAJECTORIES=100k. Gated to task in {grpo, ppo} non-mlx; since v0.76.0 'task: ppo' refuses 'echo_trap_enabled' before the model loads (the PPO trainer cannot feed the trajectory buffer), so use 'task: grpo'. Composes with v0.53.11 GRPOStabilityCallback. LIVE as of v0.71.11 — the GRPO callback now scores per-trajectory n-gram repetition, logs the verdict, and halts on TRAP when 'echo_trap_halt' is set. These are config keys, not CLI flags: the only echo-trap option on 'soup train' itself is '--echo-trap-tokenizer-aware'.

Question 29

What is 'soup build' and how is it dbt-shaped?

Accepted Answer

'soup build <manifest.yaml> [--dry-run]' (v0.69.0) is a dbt-shaped DAG of dataset transforms with incremental materialisation. Closed SUPPORTED_MODEL_KINDS = {incremental, table, view}. Topo-sort via Kahn's algorithm. The 're-tokenise only changed rows' kernel: compute_row_hash (SHA-256 over canonical-JSON, 'id' field excluded) + incremental_diff(prev, new) → {added, changed, removed, unchanged}. DoS caps _MAX_MODELS=256, _MAX_REFS_PER_MODEL=32, _MAX_FILE_BYTES=1 MiB. '--dry-run' validates topology and exits 0. LIVE as of v0.71.6 — run_build materialises datasets with five built-in transforms, and that is the whole list: identity, drop_empty, lowercase, add_field and token_count. 'table' rebuilds, 'view' re-derives (and is never written to a file, so end a build that feeds training in a 'table' or 'incremental' model), 'incremental' re-transforms only the rows whose content hash changed (SQLite state store keyed by row hash + transform fingerprint). A custom transform can be passed per-run via the Python API OR named in the manifest as a dotted import path, 'module.path:function_name', which the CLI resolves lazily and which is arbitrary code execution, so only run a manifest you trust. An unknown transform name is caught by the runner rather than the plan, so '--dry-run' passes a manifest whose real run fails.

Question 30

What does 'soup expect' assert about a chat dataset?

Accepted Answer

'soup expect ' (v0.69.0, LIVE) is a Great Expectations suite for chat data with a closed SUPPORTED_EXPECTATIONS allowlist: expect_no_pii (reuses v0.47 Presidio analyzer), expect_token_length_between (min_tokens / max_tokens bounds over whitespace-separated words, defaulting to 1 through 1,048,576 so an empty row fails), expect_no_refusal_pattern (reuses v0.56 refusal detector), expect_chosen_preferred_over_rejected_by_judge (it needs a judge: pass --judge or set args judge in the suite entry; with none it flags every preference row as a violation and exits 2, unless the entry sets args advisory: true, which opts back into only checking that every row has both chosen and rejected). Each suite entry must be a mapping with a name and optional args; a bare name is refused with exit 3. Walks 'text', 'content', 'output', 'prompt', 'instruction', 'response' top-level keys + 'messages[].content' nested arrays. _MAX_SUITE_LEN=64. Since v0.76.0: exit 0 = all expectations passed, 2 = an expectation failed, 3 = a usage or input error (an invalid or missing suite, a missing or unparseable dataset); exit 1 means the --judge backend was unreachable; before v0.76.0 a failure was 3 and a rejected suite was 2, so a CI script that compares the code needs a look. Drop into CI between 'soup data' and 'soup train'.

Question 31

How do 'soup data gen-magpie' and 'persona-mix' improve synthetic data diversity?

Accepted Answer

'soup data gen-magpie --base --provider ollama|vllm --target N [--quality-filter] [--plan-only]' (v0.69.0, LIVE as of v0.71.6) generates synthetic chat data via the Magpie chat-template-prefix harvest trick — prime the base model with just the assistant chat-template prefix (chatml / llama3 / gemma / mistral auto-detected) and let it complete the prompt itself. Live providers are 'ollama' and 'vllm' raw-completion endpoints (both SSRF-hardened, loopback-only); 'anthropic' is rejected (no raw-completion endpoint). '--quality-filter' drops low-quality rows via the v0.47 scorers; exact-duplicate instructions are de-duplicated. 'soup data persona-mix --prompts --n N --output [--personas ] [--styles ]' (v0.69.0, LIVE) is the Persona-Hub diversity sampler — bundled 12 personas × 5 writing styles by default (BYO Tencent 200k corpus via --personas / --styles). Deterministic by seed (random.Random(seed)); compute_topic_diversity = Shannon entropy over pooled whitespace tokens; atomic JSONL write with 100 MiB / 100k entries per loader caps.

Question 32

How does 'soup data brain-rot' detect AI slop in training data?

Accepted Answer

'soup data brain-rot <data.jsonl> [--strict] [--max-major-fraction 0.25]' (v0.69.0, LIVE) implements the arXiv 2510.13928 brain-rot detector with two pure-Python scorers: score_triviality (token-diversity inversion + '!!' / '??' punctuation runs + low-effort token density + length penalty) and score_popularity_signal (clickbait phrase scan + emoji U+1F300–U+1FAFF density). Worst-signal-wins composition: 1.0 − max(triviality, popularity). Bands match the v0.26 / v0.56 / v0.65 taxonomy: OK ≥ 0.85, MINOR ≥ 0.60, else MAJOR. refuse_if_rotten raises when MAJOR fraction exceeds threshold. '--strict' exits 3 on excessive MAJOR. English keywords by default; '--lang' selects a bundled per-language bundle (en, es, fr, de, ru).

Question 33

What is 'soup compile' and why does it hedge against prompt engineering winning over fine-tuning?

Accepted Answer

'soup compile --eval [--optimizer mipro|gepa|textgrad|copro|bootstrap_fewshot] [--max-iters N] [--output ] [--plan-only]' (v0.68.0) is a DSPy + GEPA + TextGrad prompt-program compiler — if prompt engineering paradigms keep winning over fine-tuning, you have the compilation surface inside Soup. Hard bound MAX_COMPILE_ITERS=1000. Closed optimiser allowlist of 5. validate_program_path requires '.py' extension, cwd containment, and os.lstat + S_ISLNK rejection via the shared paths.enforce_under_cwd_and_no_symlink helper. CompileResult enforces finite-score (no NaN / ±Inf) and iterations ≥ 0. Module is commands/compile_cmd.py because 'compile' is a Python builtin. LIVE as of v0.71.13 behind the '[compile]' extra (pip install "soup-cli[compile]") — run_compile dispatches DSPy / GEPA / TextGrad optimisation; '--plan-only' still renders the plan and exits 0.

Question 34

What does 'soup distill-prompt' do?

Accepted Answer

'soup distill-prompt --traces --teacher --student --strategy sft|preference|kl [--output ] [--plan-only]' (v0.68.0) distils prompt-heavy traces — long system prompts, in-context examples — into small fine-tunes that internalise the prompt. Closed strategy set {sft, preference, kl}. Teacher / student IDs capped at 512 chars; null-byte + empty rejected. Composes with v0.71 cross-tokenizer ULD — distill-prompt picks the dataset shape, ULD bridges teacher / student vocabularies. LIVE as of v0.71.13 — prepare_distill_dataset calls the teacher once per trace via the v0.20 providers (Ollama / Anthropic / vLLM) and emits sft/kl messages or preference chosen/rejected pairs. The teacher and student are provider model names (Ollama tags by default), not Hugging Face repo ids, and a failing teacher call is swallowed, so a wrong name ends with zero rows written and exit 0: read the row count.

Question 35

How does 'soup apple-adapter' target Apple FoundationModels?

Accepted Answer

'soup apple-adapter --direction hf-to-mlx|mlx-to-hf|hf-to-apple|mlx-to-apple --output [--sign/--no-sign] [--plan-only]' (v0.68.0) converts adapter formats between HuggingFace safetensors and Apple MLX npz, with optional Merkle-root signing; the two '*-to-apple' directions (Apple FoundationModels, iOS 26+) are accepted but refuse with exit 3 until Apple publishes a stable adapter format. Closed direction allowlist of 4. Explicit S_ISDIR + symlink rejection on source. 'sign' must be a real bool (bool-as-int defence). Reuses v0.60 Part B signing infrastructure and extends the v0.25 MLX backend. Live convert_apple_adapter ships in v0.68.1 (Apple's spec is still moving).

Question 36

What is 'soup local-rl' and how does the personal-LLM flywheel work?

Accepted Answer

'soup local-rl {init, status, record, harvest, train}' (v0.68.0) is a personal-LLM feedback flywheel daemon (LIVE except 'train'). 'soup local-rl init --db ' creates a POSIX 0o600 SQLite DB with interactions + thumbs tables (idempotent CREATE TABLE IF NOT EXISTS). 'soup local-rl record --db --prompt --response --thumb up|down' parameterised inserts with 16 KiB prompt + 16 KiB response caps and null-byte rejection. 'soup local-rl status --db ' renders a Rich table of interactions / up / down counters. 'soup local-rl harvest --db ' walks thumbs by ts ASC and emits one DpoPair{prompt, chosen, rejected} per prompt with both an up and down (last-writes-win dedup), atomic JSONL write via tempfile.mkstemp + os.replace — operators feed this straight into 'soup train with task: dpo'. 'soup local-rl train' is LIVE as of v0.71.13 — '--once' harvests the latest thumbs DPO pairs and runs a real nightly DPO/KTO/ORPO train via a 'soup train' subprocess (a 'state' table skips re-runs with no new feedback or fewer than --min-pairs); without '--once' it renders an injection-safe systemd .service/.timer + launchd .plist scheduler scaffold.

Question 37

What is 'soup adapters merge --strategy cmaes' and why is it different from linear / TIES / DARE / SVD?

Accepted Answer

'soup adapters merge -o --strategy cmaes --eval --budget 1h' (v0.67.0) runs Sakana-style evolutionary search over LoRA merge weights via pure-Python rank-mu CMA-ES (no 'cma' dependency). The optimiser parameterises N-1 logits, softmaxes them onto the simplex (sum=1, each ≥0), samples a population, keeps the elite half, and plateau-detects after 3 generations without improvement (converged=True). Bounds: 2–16 adapters, population [2, 256], generations [1, 10K], budget [60s, 24h] (reuses v0.57 blame.parse_budget). Operator-supplied eval_fn closure; failures swallowed with a sentinel -1e9 score so one broken eval doesn't crash the run (mirrors v0.40.3 proxy-failure isolation). Linear / TIES / DARE / SVD are still available as fast deterministic baselines; CMA-ES is for when you actually have a measurable eval and want the optimiser to search for you. LIVE as of v0.71.4 — the full CMA-ES loop now merges, materialises, and scores each candidate against the eval suite and writes the best-weighted merge to --output; the backdoor-scan + license gates run for cmaes too. '--eval' is a JSONL tasks file (the format 'soup eval custom' reads, not a YAML suite), and '--canary' / '--strict-verdict' are refused with --strategy cmaes (exit 2) because the eval suite already drives the search.

Question 38

What is the VeRA / VB-LoRA vector bank and why does it matter for multi-tenant serving?

Accepted Answer

'soup_cli.utils.vector_bank' (v0.67.0) is the storage format for VeRA / VB-LoRA — shared random projection matrix P (d_model × d_model) + per-user scaling vector v_u (vector_dim floats). A 128-D scaling vector at fp32 is ≈512 bytes per user vs. ~30 MB for a rank-16 LoRA on a 7B model — thousands of per-user adapters at MB-each instead of hundreds-of-MB per LoRA. Hosted vendors price by GPU-hour, not adapter count, so they structurally cannot offer this economics. Schema: bank name (kebab-case, ≤128 chars), base_model (≤512 chars), per-entry {user_id (≤256 chars), scaling_vector (floats, finite, no NaN/Inf)}. Bounds: vector_dim [1, 16K], up to 1M entries per bank, 16 MiB file-size cap, atomic JSON I/O via shared paths.atomic_write_text + cwd containment + symlink rejection. estimate_bank_size(num_users, vector_dim) for capacity planning. LIVE as of v0.71.12 — 'soup serve --bank <bank.json> [--bank-strength S]' reconstructs the shared projection + per-user scaling vectors and installs a decode-time forward hook; the active user is chosen per request via the 'X-User-Id' header (an unknown/absent id is a zero-delta no-op, so there is no cross-request leak), serving N personas at ~KB-per-user.

Question 39

What is MoLE per-token gating in Soup CLI v0.67?

Accepted Answer

task='moe_lora_routing' (v0.67.0) is Mixture of LoRA Experts: a gating network routes per-token activations to top-K task adapters via softmax over the hidden state. Config: MoleGatingConfig with num_task_adapters [2, 64], hidden_dim [1, 16K], temperature (1e-6, 100.0] finite, top_k ≤ num_task_adapters. Cross-validator rejects mlx backend. Beyond 64 adapters per-token softmax becomes the bottleneck; for more, hierarchy the gating. LIVE as of v0.71.12 — 'task: moe_lora_routing' with 'mole_task_adapters: [...]' trains a real per-token gating network that blends N frozen task LoRAs (mole_top_k / mole_temperature); only the router trains, and the gate is saved as 'mole_gate.pt' alongside the run.

Question 40

How do 'soup adapters pr' adapter pull requests work?

Accepted Answer

'soup adapters pr --base-sha <64-hex> --adapter <path> --eval <eval_delta.json> --samples <sample_diffs.json>' (v0.67.0) renders a GitHub-shaped pull request from an adapter triple {base SHA, dataset diff, adapter weights, eval-delta report} as review-friendly Markdown with an eval-delta table + per-sample baseline/candidate diffs. Bounds: ≤64 EvalDelta entries, ≤256 sample diffs, per-output cap 32 KiB to keep PRs reviewable. The _md_table_escape function neutralises backslash, pipe, newline, CR, and tab characters in operator-controlled cells against Markdown / Rich injection. JSON output is also available for the v0.68 GitHub Action that will post the PR comment. Composes with 'soup adapters diff' from v0.57.

Question 41

What does 'soup lock' do and how is it different from 'soup env lock'?

Accepted Answer

'soup lock write --base-model --base-sha <64hex> --dataset-sha <64hex> --env-hash <64hex>' (v0.67.0) computes closure_sha = SHA256(base_sha || dataset_sha || env_hash) and writes a JSON soup.lock with soup_version, base_model (≤512 chars), and the three SHAs. The point: commit soup.lock to git alongside soup.yaml so the entire team trains on identical (base, dataset, env). 'soup lock check' compares the 5 content fields and exits 2 on drift (3 when the lock file is missing or unparseable; drift was 3 before v0.76.0); soup_version + created_at are advisory only (legitimate operator upgrades don't trigger drift). 'soup env lock' is v0.64.0 — it produces the env_hash that feeds soup.lock; the two together close the reproducibility chain.

Question 42

What is 'soup adapters bisect' and how does it work?

Accepted Answer

'soup adapters bisect ... --eval-command "soup eval gate --suite gate.yaml --baseline baseline.json --model {ckpt}"' (v0.67.0) does binary search over an ordered checkpoint history to find the first regression boundary. The eval command has to exit non-zero on a failing checkpoint: soup eval gate does, soup eval custom does not (it exits 0 whenever the eval completes), so with it every checkpoint would pass. The operator supplies a shell template with a {ckpt} placeholder — Soup uses shlex.split after shlex.quote(ckpt), argv-list mode, no shell=True. Probes both endpoints first to short-circuit all-OK or all-broken, then ~log₂(n) midpoint probes. Verdicts: ALL_OK or BROKEN_AT (returns first_broken checkpoint ID). Exit 2 on BROKEN_AT for cron-friendly automation. Input: 2..4096 unique ordered checkpoint IDs.

Question 43

What does 'soup tunability' decide before you pick a base model?

Accepted Answer

'soup tunability --dataset <path> --candidates qwen3-1.7b,llama-3.2-3b,phi-4-mini --probe-steps 100 --holdout-size 64' (v0.64.0) ranks the candidate bases with a deterministic offline heuristic and reports the Pareto frontier (best efficiency for cost); add '--live' to probe each candidate with a lightweight LoRA on a held-out dataset slice and rank on measured training-loss deltas. The candidate allowlist is closed and ships with licensing metadata (Apache-2.0, MIT, LLaMA-3, etc.). '--plan-only' dry-runs without probing; '--list' catalogues all bundled candidates. Bounds: probe_steps [10, 10000], holdout_size [10, 100000] rows. Output: per-candidate delta (base_loss - probe_loss), wall-clock seconds, estimated USD cost, Pareto frontier membership. Safety: path containment (is_under_cwd), null-byte rejection, symlink-escape rejection on dataset and output paths.

Question 44

What is 'soup plan' / 'soup apply' and how is it Terraform-shaped?

Accepted Answer

'soup plan --config soup.yaml --state ./soup.tfstate' (v0.64.0) reads a training configuration, computes cost / ETA / peak-VRAM / SHA-256 hashes, and writes an immutable state file. 'soup apply' re-reads the config, detects any drift (changed batch size, dataset SHA, base SHA) and refuses (exit 3) if drift is found; otherwise it marks the plan applied and prints the 'soup train' command to run, and it does not start training itself. State shape: plain JSON with 'plan' (cost, ETA, SHA hashes), 'applied' (bool), 'applied_at' (ISO timestamp), 'run_id' (reserved). TOCTOU defense: config read as YAML with os.lstat before open; symlinks explicitly rejected. Peak VRAM calculated with a 10% safety margin; estimated cost + minutes included with spot pricing per GPU tier. Composes with v0.60 license-check for adapter merge and v0.67 soup.lock for the full reproducibility chain.

Question 45

How does 'soup env lock' detect ABI drift?

Accepted Answer

'soup env lock --output ./soup-env.lock' (v0.64.0) snapshots the current Python environment (version, CUDA version, platform, and whichever of 15 tracked packages are installed, not every installed package) into a JSON lockfile. The CUDA version is the full string read from CUDA_VERSION / CUDA_HOME or an already-imported torch, so without those no CUDA version is recorded and a CUDA change goes unseen. 'soup env check --lock ./soup-env.lock' compares the current env against the lock and exits 3 on ABI-sensitive drift that would invalidate training: a Python minor version change, a platform change, any change of the recorded CUDA version string, or a changed version of a tracked package. Fields: soup_version, python_version, platform, cuda_version (null when none was found), ISO timestamp, per-package {name, version, source}. Atomic write to lock file; reads have a file-size cap (no unbounded YAML). The env_hash from 'soup env lock' feeds the v0.67 soup.lock closure for full team reproducibility.

Question 46

What does 'soup license-advisor' decide for a deploy target?

Accepted Answer

'soup license-advisor --target b2c|defense|embedded --license <id> --monthly-active-users 0' (v0.64.0) recommends license-clean base models for a deployment target. Returns ok (safe), warn (yellow), or block (red; exits 3) with a reason string and recommended/forbidden license lists. Per-license risk scales with expected MAU (e.g., LLAMA-3 OK for <1M MAU, risky above). Composes with the v0.60 license_matrix.check_license_compat gate on 'soup adapters merge' — so a 33-entry SPDX matrix governs adapter merges, while license-advisor governs base-model selection upstream.

Question 47

What new failure modes does 'soup eval behavior' / 'eval capability' / 'eval checklist' add in v0.65?

Accepted Answer

v0.65.0 takes failure-mode coverage from 6 to 10 (7 to 11 counting the citation probe added in v0.71.10). 'soup eval behavior --battery xstest|harmbench|jailbreakbench|elephant|syceval --evidence ' diffs pre/post-FT on bundled safety / refusal / jailbreak / sycophancy probe sets with OK/MINOR/MAJOR via the v0.26/v0.56 thresholds (≥0.85 OK, ≥0.60 MINOR, else MAJOR). 'soup eval capability --suite full|fast|math|code' emits validated lm-eval-harness task IDs for 7 bundled benchmarks (MMLU-Pro, GPQA, BBEH, AIME, MATH-500, HumanEval+, SWE-bench-Verified). Add '--live --model ' to run the suite through lm-eval instead of only emitting task IDs; 'soup eval behavior' takes '--base-model' and '--adapter' for a live pre/post diff. 'soup eval checklist ' runs CheckList-style MFT (minimum functionality, keyword in response) / INV (invariance under paraphrase) / DIR (directional perturbation) tests from a 1 MiB-capped YAML spec with up to 1,000 tests. It loads no model: it scores the responses you pass with '--evidence', which is required since v0.76.0 ('soup eval checklist' without it exits 3, as does 'soup eval behavior' with neither --evidence nor --base-model). Evidence files capped at 16 MiB with O_NOFOLLOW open against symlink swap.

Question 48

What does 'soup eval irt-subset' do?

Accepted Answer

'soup eval irt-subset <responses.jsonl> --size full|small|tiny' (v0.65.0) fits a 1-parameter Rasch Item Response Theory model (the default; '--model 2pl' or '3pl' fit the richer models and need a respondent_id on each row) to per-item correctness signals and selects a minimum-cost subset that preserves ranking power. The math: P(correct | ability θ, difficulty β) = σ(θ - β); β_i = -log(p̂_i / (1 - p̂_i)); item information I(β) = σ(-β) · σ(β) which peaks at β≈0 (50/50 items are most discriminating). Profiles: full (100%), small (~30%), tiny (~10%). Input shape: JSONL rows {item_id (str, ≤256 chars, no null bytes), correct (bool), score? (float)} up to 1M rows. Pure-Python math (no numpy/scipy in v0.65.0); 256 MiB file cap against unbounded uploads.

Question 49

What is 'soup probe sae-diff' and which SAE repos are bundled?

Accepted Answer

'soup probe sae-diff --top-k 20' (v0.66.0) applies a Sparse Autoencoder encoder to pre- and post-FT activation batches, computes per-feature mean changes, and reports the top-K most-changed features. Purely descriptive (no verdict gate); designed for CI logging and model cards. The SAE repo allowlist is closed — Gemma Scope (2B/9B/27B residual-stream), EleutherAI Pythia SAEs, JBloomAus Llama SAEs, OpenAI GPT-2 SAE — and as of v0.71.8 '--auto-download' fetches an allowlisted SAE from the HF Hub into '~/.soup/sae-cache/' (validated against the allowlist BEFORE any network call, via an SSRF-hardened snapshot_download). Input shape: JSON with 'activations': [[...], ...] (2D float32 matrix [num_tokens, hidden_dim]) read via O_NOFOLLOW to prevent symlink swap. Output: SaeFeatureDiffReport with top-K features and per-feature {feature_id, delta, pre_mean, post_mean}. Bounds: top-k [1, 10K], up to 1M SAE features, up to 1M tokens per activation batch, 16 MiB evidence file cap.

Question 50

How does 'soup probe sleeper' work?

Accepted Answer

'soup probe sleeper --evidence ' (v0.66.0) applies a linear defection probe (synthetic, deterministic placeholder weights keyed on base name, so the bundled verdict exercises the plumbing and says nothing about the model) to a 2D activation tensor. Classifies per-token scores as defection or benign, returns flagged rate, and assigns OK/MINOR/MAJOR: ≤1% → OK, ≤5% → MINOR, >5% → MAJOR. Without '--weights' the base must be one of six exact ids (meta-llama/Llama-3-8B, meta-llama/Llama-2-7B, mistralai/Mistral-7B-v0.1, Qwen/Qwen2-7B, google/gemma-2-9b, google/gemma-2-2b) — metadata includes hidden_dim, threshold, description. With '--weights ' (v0.71.8) it uses your calibrated probe weights instead of the synthetic seed fallback and accepts any base id. Activation input: JSON {'activations': [[...], ...]} (2D float32 [num_tokens, hidden_dim]); 1M token cap. No evidence = OK report with 0 tokens (matches v0.56 diagnose neutral-mode policy). 16 MiB evidence cap, symlink rejection.

Question 51

What is 'soup probe interference' and when does it gate CI?

Accepted Answer

'soup probe interference <losses.json>' (v0.66.0) builds an N×N matrix of adapter pairwise compatibility scores from operator-measured losses. Input JSON has 'adapters' list and 'losses' dict with keys like 'a|b' (loss on domain A when both A and B loaded) and 'a|a' (baseline loss with A alone). Formula: score(A→B) = (loss(A_target | A+B) - loss(A_target | A alone)) / loss(A alone). Classification: |score| <5% → OK, <20% → MINOR, ≥20% → MAJOR. Bounds: 2–16 adapters (4–256 pairwise probes); adapter names ≤256 chars and markup-escaped against Rich/Markdown injection before render. Output: InterferenceMatrix with cells and worst-pair summary; exits 2 if worst ≥20% interference (gates CI merge).

Question 52

How does 'soup ingest' pull traces from observability vendors?

Accepted Answer

'soup ingest --source langfuse|langsmith|helicone|openpipe|otel|openai-stored --logs --output ' (v0.63.0) normalises any observability export into one TraceRecord schema (trace_id / prompt / output / source / signal / metadata as a MappingProxyType so callers can't mutate). By default there are no network calls: the operator exports from the SaaS dashboard, then 'soup ingest' parses the file. Since v0.75.0 Langfuse is the one source Soup can also fetch for itself: 'soup ingest --source langfuse --pull --since 24h' reads Langfuse's Observations API v2 directly and writes one row per GENERATION observation, with credentials taken only from the environment and never a flag, HTTPS enforced through the same SSRF validator as --slack-url, redirects refused rather than followed with credentials attached, 30 s per request, 64 MiB per response, and a --max-pages cap (default 100, max 10000) that exits 1 writing nothing rather than truncating. Six sources at launch: LANGFUSE_PUBLIC_KEY plus LANGFUSE_SECRET_KEY for Langfuse (the older single-key hint named LANGFUSE_KEY, a variable Langfuse does not read; corrected in v0.75.0), LANGSMITH_API_KEY for LangSmith, HELICONE_API_KEY for Helicone, OPENPIPE_API_KEY for OpenPipe, OTEL_EXPORTER_OTLP_HEADERS for OpenTelemetry OTLP, OPENAI_API_KEY for OpenAI Stored Completions. PII warning prints once per invocation. Output feeds directly into the v0.26 'soup data from-traces' preference-pair builder and the v0.58 'soup loop' HarvestFn — closing the production-traces → training loop without paying per-trace fees to any vendor.

Question 53

What does 'soup prune-prompt' do?

Accepted Answer

'soup prune-prompt --input --output --min-frequency 0.95' (v0.63.0) detects the longest shared system-prompt prefix across all rows via binary search over up to 32 candidate lengths and strips it. By removing the shared boilerplate (e.g., 'You are a helpful AI assistant...'), the fine-tuned model internalizes it into its weights instead of repeating it on every turn — OpenPipe's signature trick at the data layer. Two-pass file read; capped at 100k rows. v0.63 fixed an O(N²) early-exit bug from the prototype detect_common_prefix function.

Question 54

What is 'soup ab' and how is it different from a fixed-N A/B test?

Accepted Answer

'soup ab --input --metric latency|judge_score|retry_rate --alpha 0.05 --effect-size 0.1' (v0.63.0) is a sequential A/B test you can re-run after every new row without breaking its error guarantee: you can peek at any sample count and read reject_h0, accept_h0 or continue. Through v0.75.2 it was an mSPRT (a Gaussian-mixture likelihood ratio read against Wald's two boundaries) configured with --alpha and --beta. Since v0.76.0 it is two-sided, so a treatment that moves the wrong way is reported as worse through a 'direction' field read against the metric's polarity (judge_score: higher is better; latency and retry_rate: lower is better), and it decides with a normal-inverse-gamma Bayes factor that depends on the rows only through the t statistic, so its false-positive rate stays at most --alpha however often you re-run it. accept_h0 comes once a confidence sequence at level --alpha for the difference lies inside plus or minus --effect-size, so --alpha bounds both wrong verdicts. Upstream's record of that accept rule (benchmarks/gate-1418-ab-cs-accept.md) compares it only against designs that were not released, on simulated rows, so no speed-up or rows-needed figure is stated here. '--beta' is retired, and since v0.77.0 passing it exits 2; to make accept_h0 stricter, lower --alpha. Three metrics: latency, judge_score, retry_rate. The exit code is 0 on every decision, so read 'direction' to gate on a regression. Input rows: {arm: 'control'|'treatment', : }.

Question 55

What does 'soup drift-alarm' watch in production?

Accepted Answer

'soup drift-alarm --reference --live --threshold 0.2 [--slack-url ... --discord-url ...]' (v0.63.0) computes KL divergence between token-distribution snapshots at fine-tune time (reference) and production (live). Catches both behavioral drift ('model now outputs JSON when it didn't before') and vocabulary drift ('same 20 phrases on repeat'). Tokenization is whitespace only; there is no tokenizer option. Optional Slack / Discord webhooks fire on drift, SSRF-validated: HTTPS hosts are accepted, plain HTTP only for loopback, and RFC1918 / link-local / cloud-metadata IPs (169.254.0.0/16, 100.64.0.0/10, 198.18.0.0/15) are rejected on either scheme. Exit code 3 on drift for cron-friendly automation. Input rows: one JSON object per line with the model output under 'output' ('response' and 'text' are accepted too); a row without one of those keys is skipped, and since v0.77.0 a reference or live file with no usable row exits 1 and shows no verdict panel, naming the file and the keys it reads (#1905; before v0.77.0 it showed n_reference 0 and an OK verdict).

Question 56

How does Soup CLI handle GDPR right-to-be-forgotten?

Accepted Answer

Soup CLI v0.61.0 ships 'task: unlearn' as a first-class trainer with three methods: NPO (Negative Preference Optimization — DPO-shaped negative-only loss, needs reference model + retain set), SimNPO (length-normalized NPO, no reference model needed — faster on long sequences), and RMU (Representation Misdirection Unlearning — residual-stream noise on forget inputs, best for concept-level removal). Config: set 'task: unlearn', 'training.unlearn_method: npo|simnpo|rmu', 'training.unlearn_alpha' (0.0–10.0, retain-set weight; unset resolves to 1.0 in the trainer, and since v0.77.0 an explicit 0.0 is pure forget loss, as documented; before v0.77.0 it ran as 1.0), 'data.forget_set' (required JSONL or HF dataset ID), 'data.retain_set' (optional, strongly recommended for NPO). Verify with 'soup eval unlearning --benchmark tofu|muse|wmdp --evidence ' which scores Forget Quality / Model Utility / PrivLeak from the pre/post numbers you supply and emits an OK / MINOR / MAJOR verdict (exit 2 on MAJOR). It runs no benchmark itself: a metric you leave out, and the whole report when there is no --evidence, scores a neutral OK, so an all-green report without evidence means nothing was measured. The trainer is LIVE as of v0.71.9 — covariance-free NPO / length-normalised SimNPO / RMU representation-steering kernels run end-to-end, warning when run without a retain set.

Question 57

Can I patch a single fact in a model without retraining?

Accepted Answer

Yes. Soup CLI v0.61.0 ships 'soup edit set --base --method rome|memit|alphaedit --subject "" --target ""' for surgical fact patching. Three methods: ROME (Rank-One Model Editing, targets MLP layers — Meng 2022), MEMIT (Mass-Edit Memory in a Transformer — Meng 2023), and AlphaEdit (ROME projected orthogonal to the down-proj's top singular direction). LIVE as of v0.71.9 — covariance-free rank-1 weight-edit kernels apply the update and optionally save (on a tiny model a ROME edit moved P('Lyon' | 'The capital of France is') from 0.0016 → 0.96); a SQLite EditGovernor enforces the per-base edit cap + norm-blowup refusal across separate runs. '--method grace' is a fourth method: it appends a (key, value) pair to a grace_codebook.json sidecar and leaves the base weights untouched, and no Soup command at v0.77.0 applies that codebook at decode time (the training.grace_codebook config fields, which nothing read, are refused at load since v0.77.0 when set away from their defaults; the 'soup edit set --method grace' command is unchanged). 'soup edit diff

--probes probes.jsonl --before-model --after-model ' runs each probe prompt through both models and lists the completions that changed; the two ids are labels for the report, not registry lookups, and since v0.76.0 the command requires both --before-model and --after-model when --probes is given (it exits 2 otherwise). The Sequential Edit Governor, consulted by 'soup edit set' and by the GRACE edit, refuses further edits on a base model once 50 have been recorded and after an edit whose measured weight-norm change reaches the blow-up threshold; it cannot stop the edit that causes the blow-up, because the change is only known afterwards, and its state lives in a SQLite store ('SOUP_EDIT_GOVERNOR_DB' moves it): a store path that is refused or cannot be created disables the governor with a 'Governor disabled' note and the edit goes ahead, but a corrupt database stops 'soup edit set' with an error.

Question 58

What is RAFT and how does Soup CLI implement it?

Accepted Answer

RAFT (Retrieval Augmented Fine-Tuning, Stanford 2024) teaches a model to use retrieved context — both golden and distractor documents — to answer queries. Soup CLI v0.62.0 ships 'data.format: raft' with per-row schema {query, golden_doc, distractor_docs[], answer}. Pair with 'training.ra_dit_stage: retriever|generator' for the RA-DIT two-stage pipeline: stage 1 trains a contrastive sentence-transformer ('ra_dit_retriever_model: sentence-transformers/all-MiniLM-L6-v2' default), stage 2 SFTs the main model on RAFT rows. LIVE as of v0.71.10 — RAFT span-mask training masks the prompt to -100 and labels each doc '[doc-N]' so the model learns to cite the supporting document (reproducible shuffle via 'data.raft_shuffle_seed'), and the 'soup ra-dit' one-shot orchestrator trains retriever then generator in a single command, recording the trained retriever as the generator's paired retriever (auto-linked from the Registry when unset). Add 'training.citation_faithful: true' + 'citation_style: bracket|inline|footnote' to raise the loss weight on citation spans during training. 'citation_recall_threshold' never refused a save, because nothing read it, and since v0.77.0 setting it refuses the load ('is accepted but read by nothing; refused as of v0.77. Delete the line.'); measure recall afterwards with 'soup eval citation' or the diagnose citation probe. Three new recipes shipped: raft-llama3-8b, ra-dit-retriever, ra-dit-llama3-8b.

Question 59

Can I steer a model's behavior at inference time without fine-tuning?

Accepted Answer

Yes. Soup CLI v0.62.0 ships 'soup steer train --base --method caa|iti|repe --name --pairs ' for training activation steering vectors, then 'soup steer apply --name --strength ' to load a stored vector and print its metadata (|strength| ≤ 10 enforced); the decode-time intervention itself is 'soup serve --steer'. Three methods: CAA (Contrastive Activation Addition, adds a learned vector to the residual stream), ITI (Inference-Time Intervention, shifts specific attention heads), and RepE (Representation Engineering, PCA-based direction extraction). Pairs JSONL: {positive: '', negative: ''}. The Registry has a 'steering_vector' artifact kind (v0.26), and since v0.76.0 'soup steer train --registry-id ' attaches the trained steering_vector.safetensors as a steering_vector artifact (a failed attach exits 1 with the vector already on disk); through v0.75.2 it passed the directory, the Registry refused it, and the command warned and exited 0 with nothing recorded. LIVE as of v0.71.10 — 'soup steer train' fits the CAA/ITI/RepE control vector from {positive, negative} pairs and persists a safetensors + config artifact, and 'soup serve --steer --steer-strength ~~' applies it at decode time via a forward hook. Use case: nudge safety, formality, or domain focus without a full SFT/DPO run.~~

Question 60

Does Soup CLI generate compliance docs for procurement / regulators?

Accepted Answer

Yes (v0.59.0 'Governance & Provenance'). 'soup bom emit --name --version --base-model --base-sha <64-hex> --config-sha <64-hex> --task --license --format cyclonedx|spdx|both --output ' (with --format both, --output is a prefix and it writes .cdx.json and .spdx.json) produces machine-learning Bills of Material in CycloneDX 1.6 (with the ML-BOM extension) and SPDX 2.3 AI-profile formats — both, in one shot. 'soup attest emit --stage extract|train|eval|export|publish --subject --sha <64-hex> --builder --invocation --sign unsigned|ed25519|sigstore' writes SLSA-3 in-toto attestations per stage (ed25519 needs the [sign] extra and a key; since v0.76.0 sigstore signs keylessly through Fulcio and Rekor, needs the [sigstore] extra, an ambient OIDC identity such as GitHub Actions or the opt-in --interactive-oidc, and --output, writes the bundle into the .sig sidecar, and never falls back to an unsigned statement: without the extra it exits 2 and writes nothing; 'soup attest verify' then needs --cert-identity and --cert-oidc-issuer). 'soup audit-log tail/rotate' keeps a HIPAA/SOC2-shaped JSONL audit log at ~/.soup/audit.jsonl in which credentials are masked (hf_, sk- and Bearer values, the values of credential-named options and, since v0.76.1, the values of '--slack-url' and '--discord-url', while '--min-tokens', a length threshold, is no longer masked); every other argument, the operator's user name and the host name are recorded as typed, so it is not PII redaction. Since v0.77.0, lines written by older versions get the same masking as new lines, applied once when the log is next written (#2065). 'soup train --annex-xi --repro-receipt ' emits EU AI Act Annex XI/XII documentation plus SR 11-7 reproducibility receipts (every seed, kernel version, library version, dataset hash). All atomic writes (tempfile.mkstemp + os.replace) with symlink-rejection TOCTOU defense.

Question 61

How does Soup CLI prevent supply-chain attacks on LoRA adapters?

Accepted Answer

Six controls in v0.60.0. (1) 'soup adapters scan ' spectral-analyses LoRA weights for backdoors: rank-1 dominance (warn at 50×, fail at 200×), top-singular-value energy concentration (warn > 75%, fail > 95%), Frobenius outliers (warn > 4σ, fail > 8σ), NaN/Inf. Exit 0/1/3 for OK/WARN/FAIL — pure numpy, no torch. (2) 'soup adapters sign ' computes a Merkle root over all files and writes .soup-signature.json — real ed25519 detached signatures are LIVE as of v0.71.2 via the '[sign]' extra ('--backend ed25519 --key ' or '--generate-key'; 'soup adapters verify --public-key ' does a cryptographic verify, failing closed on any tamper or wrong key (and from v0.71.2 to v0.75.0 it did NOT: the trusted key was consulted only inside the ed25519 branch, so a record with any other backend verified with exit 0 even under --strict, which is fixed in v0.75.1)). Sigstore keyless signing is available from v0.76.0 ('soup adapters sign --backend sigstore', with the [sigstore] extra; 'soup adapters verify' then requires --cert-identity and --cert-oidc-issuer as an out-of-band trust policy). (3) 'soup adapters verify --strict' refuses to load on signature mismatch. (4) 'soup adapters check-safetensors --strict' refuses pickle / .bin / .pt — the single biggest LoRA attack vector. (5) 'soup adapters merge --license [--license ] --license-override ""' enforces SPDX-license compatibility via a 33-entry matrix. (6) 'soup airgap-bundle --model --output bundle.tar --dataset ... --wheel ... --kernel ... --bundle-size-cap 100' packs everything into one tarball for one-way data-diode transfer, ≤100 GiB cap, with a manifest of SHA-256 fingerprints per file. Plus a trust-on-first-use namespace pin used by 'soup spectrum scan', 'soup probe sae-diff --auto-download', the base model of a 'stream_layers: true' training run, since v0.76.0 a Hub id given as 'training.prm_reward', and since v0.77.0 the base model of 'soup merge --low-memory' when it is a Hub id: it records the repo's author and creation time on first download and refuses a later download if the author or the creation time changed (there is no command-line flag to approve a change: the refusal text names '--allow-namespace-shift', which exists only as a Python argument). It does not cover the base model that an ordinary (non-streamed) training, chat, serve, regular merge or export run loads, and it fails open when the Hub metadata or the local store is unavailable.

Question 62

What is 'soup loop' and how does the production data flywheel work?

Accepted Answer

'soup loop' (v0.58.0) runs the full production data flywheel from a single CLI: harvest production traces → distill into preference pairs → eval-gated DPO train → canary deploy → auto-rollback on regression. 'soup loop init --eval --baseline registry:// --monthly-budget 50usd --max-runs-per-day 3' creates an atomic '.soup/loop.yaml' state file. 'soup loop watch' runs as a long-running daemon (SIGTERM/SIGINT safe, reloads state every iteration so external pause/resume takes effect immediately). 'soup loop canary --traffic 5% --autoroll-on-regress' splits traffic via deterministic SHA-256 hash routing (±0.01% split granularity, threading-locked BucketStats; through v0.75.2 it only recorded the canary and its share and 'soup serve' never read them, and since v0.76.0 'soup serve' on the transformers backend routes a request by hashing its conversation key, conversation_id in the body or an X-Conversation-Id header, reading the canary state from the .soup/loop.yaml in the directory it was started from, when the canary adapter was loaded through --adapters and the request names no adapter of its own); the verdict uses the v0.26 Quant-Lobotomy OK/MAJOR thresholds with a 30-sample minimum. 'soup loop pause' / 'soup loop resume' flip atomic status without killing the daemon. 'soup loop replay []' walks per-iteration manifests at '.soup-loops//iteration.json'. Budget guardrails enforce a daily-cap → estimate-sanity → monthly-budget check order; budget-skipped iterations produce no manifests. Every iteration is recorded as a frozen IterationRecord with gate verdict, canary verdict, shipped flag, rolled-back flag, and estimated cost.

Question 63

What does 'soup advise' decide before you fine-tune?

Accepted Answer

'soup advise --goal ""' (v0.54.0) is a pre-flight decision engine that classifies the task (keyword + structural signals — tool_calls → tool_use, '' → reasoning, chat messages → input-extraction) across 7 task categories, profiles the dataset (row_count, avg input/output chars, type-token diversity, label variance, has_chosen_rejected, has_reasoning_traces — capped at 2,000-row sample), and emits a rubric verdict among PROMPT_ENG / RAG / SFT / DPO / GRPO. Heuristics: preference pairs → DPO; reasoning + ≥500 rows → GRPO; <50 rows → PROMPT_ENG; high-variance factual → RAG; default → SFT. Optional '--probe' adds ROI estimates, a heuristic computed from the shape of your data by default; add '--probe-model ' to run a live probe that loads that model, scores zero-shot and few-shot on a held-out slice and LoRA-trains on a tiny one. '--record' appends an entry to '~/.soup/advise_history.jsonl' (atomic, file-locked, 16 MiB cap). A verdict is biased only by this project's own past entries that carry a recorded outcome, and '--record' writes none (nothing in v0.77.0 sets an outcome), so recording alone does not change later verdicts. 'soup advise explain' prints the full rubric. 'soup advise compare' lists the prior verdicts recorded with '--record' (newest first, '--limit N'). Outputs the literal next command ('soup autopilot --model … --data … --goal chat') so the handoff is one paste away.

Question 64

How does 'soup eval design' derive an eval suite from your data?

Accepted Answer

'soup eval design --goal "..."' (v0.55.0) uses TF-IDF salience over your training data (10,000-row DoS-capped subsample) plus goal-keyword dispatch to draft a goal-conditioned eval suite with up to 5 dimensions and a scorer per dimension chosen from {exact_match, regex, judge, rlvr}: 'json' / 'code' / 'math' keywords → rlvr; 'classify' → exact_match; 'extract' → regex; default → judge. 'soup eval discover ' runs greedy farthest-first Jaccard-distance clustering (10,000-row cap) to surface held-out canaries + adjacent-skill probes + 25%-prefix memorization probes. 'soup eval lock ' freezes the suite as a SHA-256-checksummed 'eval_suite' artifact (canonical-JSON for stable hashes; attached to a registry entry only when you pass --attach-to-registry, next to the new 'canaries' kind). 'soup eval coverage --task ' does gap analysis against the v0.54.0 task taxonomy (each task has a recommended scorer set — e.g. reasoning → rlvr/judge, format_conversion → regex/rlvr). 'soup eval gate-install --baseline ' writes a '.git/hooks/pre-push' that runs 'soup eval against' for the baseline run and the candidate run named by SOUP_CANDIDATE_RUN_ID (a paired-bootstrap regression verdict, n_samples in [100, 100_000], ci_level in (0, 1)) and blocks the push on regression; with SOUP_CANDIDATE_RUN_ID unset the hook skips itself and lets the push through.

If you	What happened	What to do
Ran any supervised fine-tune on `backend: mlx`	`data.train_on_responses_only` defaults to `true` and reached nothing, so the run trained on your system and user turns as well as the assistant's, and the adapter metadata recorded `mask_prompt: false` regardless	Re-run. Measured over 16 two-turn conversations: 772 supervised tokens before, 146 with a correct mask
Set `training.optimizer`, `scheduler`, `warmup_ratio` or `weight_decay` on MLX	All four were dropped. Every run built a bare AdamW at a constant learning rate, whatever the recipe said, and all 32 allowlisted optimizer names became AdamW	Re-run. A name MLX cannot express is refused by name now instead of becoming AdamW
Set `training.max_grad_norm` on MLX	It reached nothing, so nothing clipped, while the same config clipped at 1.0 on every transformers run	Re-run if you use `optimizer: sgd` or saw gradient spikes. On an Adam-family run the difference is in the fifth decimal
Ran MLX with `gradient_accumulation_steps` or `gradient_checkpointing` set	Both took mlx-lm's own dataclass defaults, 1 and `False`, so your effective batch size and your memory saving were not the ones you configured, and `adapter_config.json` hardcoded both, so you could not tell from the output afterwards	Re-run. Note the upgrade change below: the default is 4, so an untouched config now trains at a 4x effective batch
Selected `grpo_variant: gspo`	The objective centred the per-token log-ratio across the batch before the completion mask was applied, so one padding token shifted the loss and gradient of every unmasked row sharing its column, and picked up a non-zero gradient of its own	Re-run. The objective is also replaced entirely, so these runs cannot be reproduced either way
Set `training.loraplus_lr_ratio`	It was forwarded to `TrainingArguments`, which has no such field, so every run that set it crashed with a `TypeError` before the first step. An advertised, schema-accepted option	Run it. It builds a real PEFT LoRA+ optimizer now, with save and resume state proven to survive
Distilled with `uld_strategy: wasserstein` or `topk_align` across two different tokenizers	Both forwarded the student's own token ids to the teacher, clamped into range. Clamping does not translate a token between vocabularies, so the teacher was conditioned on the wrong text while the loss stayed finite and plausible	Re-run with `uld_strategy: wasserstein_aligned`. The old run is not salvageable
Distilled anything with the default `train_on_responses_only`	The ULD loss ignored the response-only label mask and the causal shift the cross-entropy term already applied, so it optimised prompt tokens and the shift-boundary position too	Re-run
Chatted with, served, benchmarked, diffed or judged a model on a Llama-3, Gemma or Mistral template	The rendered chat template was handed to the tokenizer, which added its own special tokens on top, so inference sent a doubled BOS that training never saw. 2 BOS down to 1 on vendor templates, 1 down to 0 on Soup's own presets	Re-judge and re-benchmark. The weights are fine; `soup ship` verdicts, `soup bench` numbers, `soup diff` comparisons and `usage.prompt_tokens` were all taken on a prompt that differed from training by a token. Two riders: an adapter trained with `train_on_responses_only: false` saw the doubled BOS in training, so it now differs from inference by one token the other way, and the vLLM, SGLang and DeepSpeed-MII engines are not fixed (tracked upstream as #781). See the ship page
Ran `soup data validate`	It judged a row by top-level key presence while the loader runs the real converters, so the two disagreed. Six formats skipped validation entirely and reported every row valid regardless of content: `prm`, `pre_tokenized`, `input_output`, `video`, `multimodal` and `raft`	Re-validate. On upstream's own datasets this shifted 120 of 360 file-by-format verdicts, every one an over-count
Used `data.interleave` with the `over` or `probs` strategy	`val_split` ran after the padding, and a padded copy is the same row, so one row could land in both `train` and `val`. Your validation metric was computed partly on rows you trained on	Re-run and re-read the metric. Fixed on the eager local-file and all-Hub paths; the streaming path still leaks
Used `data.streaming: true` with a single Hugging Face Hub dataset name	The flag was ignored and the full dataset was materialised	Re-run. It streams now, capped at 1,000,000 rows with a warning
Hit `soup eval auto`	It ran the eval, saved the results, and then died with `TypeError: expected str, bytes or os.PathLike object, not OptionInfo`, because an unpassed typer parameter keeps a truthy sentinel as its default. Mid-training auto-eval reported it as a failed eval (upstream's note about the training callback; at v0.75.2 no trainer hands the `eval` block to that callback, so `soup train` never reaches it, see Experiments)	The results were already saved. Re-run for the report
Exported with `soup export --format awq` and no `--calibration-data`	AutoAWQ silently downloaded its own large default calibration dataset, so the artifact was calibrated on data you never chose	Re-export with explicit calibration data. It is required now, and refused before the quantizer is even imported

v0.75.0: MLX honours its config, and unknown keys refuse the load

Re-run this

The headline: six options MLX accepted and never read

Two guards for the pattern this release is named for

Breaking: an unknown config key refuses the load

Validation loss existed nowhere

`torch>=2.6.0`, which closes the limitation v0.74.0 published

Breaking: `grpo_variant: gspo` is a different objective

The Langfuse live pull

Security

Also in this release

What was measured, and what was not

Known limitations

See also