116 lines
10 KiB
Markdown
116 lines
10 KiB
Markdown
# H3 Parity Evidence Ledger
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ComfyUI is the oracle. This ledger records completed work and measured facts so
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we do not repeat investigations. A source review is never recorded as a passed
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numeric gate.
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## Reference Runs And Immutable Artifacts
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| Asset | Location on Spark | Contents | Status |
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| --- | --- | --- | --- |
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| Qwen trace | `/tmp/fl2va-qwen-trace` | `qwen_input_embeds.pt`, 50 decoder outputs in `qwen_layers/00.pt` through `49.pt`, and `qwen_layer50.pt` | Complete, immutable Comfy capture |
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| Qwen layer-0 trace | `/tmp/fl2va-qwen0-capture` | `qwen0_norm1.pt`, attention, post-attention, norm2, MLP, output | Complete, immutable Comfy capture |
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| H3 full trace | `/tmp/fl2va-full-capture` | assembled DiT input/output and `blocks/00.pt` through `49.pt` | Complete, immutable Comfy capture |
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| Working-copy capture mirror | `/home/daniel/aeon-spark-test/h3/h3-blackwell-runtime/artifacts/capture` | Qwen layer-0 and layer-50 assets plus H3 input/output | Present; do not treat as immutable if the working checkout is modified |
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| Sampler reference | `/home/daniel/aeon-spark-test/h3/h3-blackwell-runtime/artifacts/fl2va-sampler-reference` | `initial.pt`, exact `sigmas`, `step_00.pt` through `step_11.pt` | Complete, immutable Comfy capture |
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All captures above use the established prompt-only FL2VA reference:
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```text
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prompt: A brass-and-paper dragon flies above a rain-washed old city at blue hour.
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size: 320x192, length: 22 frames
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seed: 440204
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sampler: beta / res_multistep / 12 steps
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Comfy attention baseline: --use-sage-attention (SageAttention2)
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```
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This reference is **not** the 72-frame cat preview. Do not overwrite it to
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diagnose preview output.
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## Completed Findings
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| Boundary | Evidence | Result | Conclusion |
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| --- | --- | --- | --- |
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| Direct runtime build | GB10 CUDA 13 image, Torch `2.9.1+cu130`, committed SageAttention3 wheel | Repeated direct runs complete | Environment is operational; PyTorch's `sm_121` warning is stale metadata in this environment |
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| H3 attention baseline | Comfy `--use-sage-attention` versus direct backend investigation | SageAttention2 (`sage2`) was established as the H3 correctness baseline | Use `sage2` for all H3 parity gates; Sage3 remains experimental |
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| Qwen tokenizer | Direct raw-prompt tokenizer versus MiniMax H3 source contract | Raw text, no chat template, `add_special_tokens=False` | Correct for nonempty text-only prompts; empty prompt differs: direct substitutes a space while Comfy injects token `151643` |
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| Qwen embedding loading, before fix | Direct versus Comfy input embedding capture | Example direct values were approximately `11` where Comfy was approximately `0.017`; downstream refined-text mean absolute delta `1.79263` | Root cause was omitted per-row `model.embed_tokens.weight_scale` |
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| Qwen embedding loading, after fix | Direct rows multiplied by `weight_scale` in FP32 | Input embeddings matched the Comfy capture exactly | Passed for the captured nonempty text-only reference |
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| Qwen layer-50, before embedding fix | Direct versus Comfy layer-50 capture | Mean absolute delta `23.50596`, max `38977.09375` | Failed; invalidated direct text conditioning |
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| Qwen layer-50, after embedding fix but before projection fix | Direct versus Comfy layer-50 capture | Mean absolute delta improved to about `5.63` | Embedding issue fixed; remaining error was material |
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| Qwen layer-0 normalization | Direct `F.rms_norm` versus `qwen0_norm1.pt` | Mean absolute delta about `8.96e-06` | Passed to expected BF16-level tolerance |
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| Qwen layer-0 attention, before projection fix | Direct versus `qwen0_attention.pt` | Mean absolute delta about `0.0357`; layer output about `0.1496` | First material Qwen divergence was at projection/attention boundary, not tokenization, embeddings, RMSNorm, or RoPE |
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| Qwen attention backend | Comfy source inspection | Qwen chooses Comfy small-input attention, i.e. SDPA path, not Sage2 | Direct Qwen was changed to BF16 causal-mask SDPA with GQA |
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| Qwen NVFP4 metadata | Qwen layer-0 checkpoint sidecars inspected | Every Q/K/V/O and MLP projection has `full_precision_matrix_mult: true`; `o_proj` and `down_proj` also have `pre_quant_scale` | Direct was incorrectly quantizing activations for all Qwen projections |
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| Qwen NVFP4 fix | Commit `0cad1db` | Direct honors `full_precision_matrix_mult` and loads/applies `pre_quant_scale`; Spark smoke passed finite expected-shape Q and O projections | Structural fix passed; post-fix numeric QKV/MLP/layer-50 comparisons are still required |
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| Qwen layer-0 projections, after NVFP4 fix | Fresh Comfy projection capture at `/tmp/fl2va-qwen0-projections`; direct compared from captured input embedding and post-attention state | Q mean/max `6.6547e-05` / `0.00195485`; K `9.11704e-05` / `0.00241077`; V `6.0298e-05` / `0.00102112`; gate `0.000365695` / `0.0082469`; up `0.000335494` / `0.00792789`; activated `4.76882e-05` / `0.031621`; down `0.000557594` / `0.0749016` | The full-precision metadata fix removed the previous large projection failure. Projection parity is close but not strict; `down_proj` is the largest remaining layer-0 projection boundary. Preserve these numbers and do not recapture this case. |
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| H3 DiT block trace | `/tmp/fl2va-full-capture` | Block 0 was close, around mean absolute delta `0.00018`; small independent differences accumulated across blocks | Full 50-block strict parity remains failed/unresolved |
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| Sampler initial state | Comfy `initial.pt` inspected against direct preview | Comfy carries joint AV state; direct preview initializes video noise only and leaves audio zero | Known direct mismatch; identical integer seed is not sampler parity |
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| Preview output, before Qwen fixes | Dragon/locomotive prompt previews | Flower-like output | Confirmed incorrect conditioning had visible semantic impact |
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| Preview output, after Qwen metadata fix | 72-frame cat, 12-step direct preview | Cat semantic structure appears, with persistent 32-pixel-like square artifacts | Conditioning improved; denoiser/sampler/VAE boundary remains non-parity |
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| Video encoder | Direct ffmpeg raw RGB to H.264/yuv420p, no audio | Different from Comfy `CreateVideo`/`SaveVideo` | Not a valid latent-quality gate; cannot explain model-space corruption by itself |
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## Current Runtime Scope
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| Component | Implemented | Known limitation |
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| --- | --- | --- |
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| Text-only Qwen | Yes | No vision encoder, MRoPE, image/video expansion, reference labels, or modality tags |
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| Token refiner | Yes | Architecture ported; no completed direct-versus-Comfy refiner tensor comparison |
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| Prompt-only FL2VA packer | Yes | No keyframe/reference condition rows; all preview work is text-only FL2VA |
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| H3 DiT | Yes | Strict all-block numeric parity not achieved |
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| Beta/RES sampler | Yes | Exact sigma/state/update parity not demonstrated; direct preview has wrong initial audio state |
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| Video VAE decoder | Yes | No direct-versus-Comfy same-latent pixel comparison yet |
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| Audio VAE/decode/mux | No | Preview intentionally produces video only |
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| Full Ref2VA | No | References, vision conditioning, VAE encode, audio, and muxing are unimplemented |
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## Remaining Gates, In Dependency Order
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Only these are outstanding. Do not recapture or revisit rows marked complete
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unless the checkpoint, Comfy version, prompt, or backend changes.
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1. **Qwen all-layer replay after `0cad1db`.** The layer-0 projection capture
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was completed: errors are recorded above. Replay the existing 50 layer
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tensors in `/tmp/fl2va-qwen-trace`; report first failing layer and mean/max
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error. Do not generate another video before this is recorded.
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2. **Qwen projection precision follow-up if layer replay fails at layer 0.**
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Do not repeat the capture. Use `/tmp/fl2va-qwen0-projections` to isolate the
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remaining `down_proj` max error `0.0749016` and its BF16/dequantization
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boundary.
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3. **Token-refiner capture and comparison.** Capture exact Comfy pre-refiner,
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block 0, block 1, and final refined states once, then compare direct using
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the matched Qwen layer-50 tensor.
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4. **H3 assembled input comparison.** Use the existing FL2VA input capture to
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compare text rows, audio/video rows, positions, times, and segments. This
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isolates packing from DiT error.
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5. **H3 first-divergence repair.** Reuse the existing block trace. Start at
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block 0 sublayers, repair the first mismatch, then use Comfy block output as
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the next direct input to distinguish local error from accumulation. Existing
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evidence says block 0 is close but accumulation is unresolved.
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6. **Final rows and video latent.** Compare final packed video rows and
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`unpatchify_video` output with Comfy before entering the sampler.
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7. **Sampler replay using Comfy state.** Feed `initial.pt` and captured
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`sigmas` directly to the sampler. Compare video and audio denoised/update
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states for all 12 saved steps. Do not test seed equality until this passes.
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8. **VAE pixel gate.** Decode the identical captured final video latent in
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direct and Comfy and compare pixels before ffmpeg. This decides whether any
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residual grid comes from decoder behavior.
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9. **End-to-end FL2VA preview.** Generate the reference dragon only after
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gates 1-8 pass. Compare its raw final latent first, then video.
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10. **Feature/performance work.** Only then add audio, Ref2VA/reference paths,
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Sage3, CUDA graphs, and multi-GPU execution.
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## Existing Tools And Their Intended Gate
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| Gate | Tools |
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| Qwen captures | `patch_comfy_qwen_output_capture.py`, `patch_comfy_qwen_layer_trace.py`, `patch_comfy_qwen_layer0_sublayers.py`, `patch_comfy_qwen_layer0_projections.py` |
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| Qwen projection gate | `compare_qwen0_projections.py` |
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| Qwen local diagnosis | `trace_qwen0_attention.py` needs repair before reuse; it currently passes an obsolete encoder argument |
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| H3 block capture | `patch_comfy_h3_capture.py`, `patch_comfy_h3_block_capture.py`, `patch_comfy_h3_block0_sublayers.py` |
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| H3 local diagnosis | `compare_block0_qkv.py`, `compare_attention_backends.py`, `compare_block0_mlp_projections.py`, `localize_block_sublayers.py`, `localize_block_mismatch.py` |
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| Sampler | `patch_comfy_sampler_capture.py`, `compare_fl2va_steps.py` |
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| VAE | `smoke_h3_vae_decoder.py`; a same-latent direct-versus-Comfy pixel comparator still needs to be added |
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The `patch_comfy_*` tools modify `/opt/ComfyUI` and are only safe against the
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restorable Comfy reference image. Capture provenance must be appended here at
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the time a new capture is made.
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