[https://nvbugs/6435113][fix] Revert the three regressions — drop the real_text_lens per-batch slicing path… - #16201
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…LPIPS golden Commit f50ca53 (Cosmos3 Audio Output Support) silently changed three CFG-affecting behaviors that the T2I LPIPS golden (baked at 85665f5) was calibrated against, producing LPIPS 0.608 (12x the 0.05 threshold) on test_cosmos3_nano_t2i_lpips_against_golden: 1. Cosmos3CrossAttention.forward began per-batch-slicing k_und/v_und by real_text_lens when batch_size > 1. Under CFG (batch=2), the negative-prompt entry now attends over a shorter slice than the padded max_real_len used pre-audio. 2. COSMOS3_DEFAULT_NEGATIVE_PROMPT was replaced with "" (the T2I test does not override negative_prompt, so it consumes the default). 3. COSMOS3_720P_PARAMS["max_sequence_length"] was bumped 1024 -> 4096. Fix (mirrors the sibling T2V repair on repair-bot-bug6422299): - transformer_cosmos3.py: drop the real_text_lens parameter from Cosmos3CrossAttention.forward and Cosmos3GenDecoderLayer.forward and stop computing/passing it in Cosmos3VFMTransformer.forward. All batch entries revert to sharing the same k_und[:, :max_real_len] slice as before. The per-batch path was preparatory for future audio work and is not exercised by any existing audio test (audio tests use batch_size=1). - pipeline_cosmos3.py: restore the long descriptive COSMOS3_DEFAULT_NEGATIVE_PROMPT string. - defaults.py: restore COSMOS3_720P_PARAMS["max_sequence_length"] to 1024. - waives.txt: remove the stale nvbugs/6418815 skip on the T2I LPIPS test now that the fix restores it to passing. Verified on B200: LPIPS drops from 0.608404 to 0.000142. Signed-off-by: trtllm-agent <296075020+trtllm-agent@users.noreply.github.com>
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📝 WalkthroughWalkthroughThis PR reduces the Cosmos3 720p default max_sequence_length from 4096 to 1024, sets a descriptive default negative prompt, removes the real_text_lens parameter and per-batch slicing logic from cross-attention forward paths across three call sites, and removes an associated test waiver entry. ChangesCosmos3 defaults and cross-attention updates
Estimated code review effort: 3 (Moderate) | ~25 minutes Sequence Diagram(s)sequenceDiagram
participant Cosmos3VFMTransformer
participant Cosmos3GenDecoderLayer
participant Cosmos3CrossAttention
Cosmos3VFMTransformer->>Cosmos3GenDecoderLayer: layer(hidden_gen, k_und, v_und, freqs_gen, timestep)
Cosmos3GenDecoderLayer->>Cosmos3CrossAttention: cross_attention(hidden_states, k_und, v_und, freqs_cos, freqs_sin, timestep)
Cosmos3CrossAttention->>Cosmos3CrossAttention: concatenate full k_und/v_und with k/v into k_all/v_all
Cosmos3CrossAttention->>Cosmos3CrossAttention: run FULL attention mask
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@tensorrt_llm/_torch/visual_gen/models/cosmos3/pipeline_cosmos3.py`:
- Around line 42-49: Update the stale comment in pipeline_cosmos3.py near the
negative-prompt handling in the Cosmos3 pipeline so it no longer says the
default is empty. The logic around the negative_prompt check in the relevant
method (where None is skipped and COSMOS3_DEFAULT_NEGATIVE_PROMPT is
substituted) can stay the same, but the comment should accurately describe that
a developer-controlled default prompt is used instead of an empty one.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (4)
tensorrt_llm/_torch/visual_gen/models/cosmos3/defaults.pytensorrt_llm/_torch/visual_gen/models/cosmos3/pipeline_cosmos3.pytensorrt_llm/_torch/visual_gen/models/cosmos3/transformer_cosmos3.pytests/integration/test_lists/waives.txt
💤 Files with no reviewable changes (1)
- tests/integration/test_lists/waives.txt
Comment on lines
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| COSMOS3_DEFAULT_NEGATIVE_PROMPT = ( | ||
| "The video captures a series of frames showing ugly scenes, static with no motion, motion blur, " | ||
| "over-saturation, shaky footage, low resolution, grainy texture, pixelated images, poorly lit areas, " | ||
| "underexposed and overexposed scenes, poor color balance, washed out colors, choppy sequences, jerky movements, " | ||
| "low frame rate, artifacting, color banding, unnatural transitions, outdated special effects, fake elements, " | ||
| "unconvincing visuals, poorly edited content, jump cuts, visual noise, and flickering. Overall, the video is of " | ||
| "poor quality." | ||
| ) |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
Stale comment after negative-prompt default change.
With COSMOS3_DEFAULT_NEGATIVE_PROMPT no longer empty, the unchanged comment at Line 686 ("None negative_prompt means the empty default will be used (safe); skip it.") no longer reflects reality. The guardrail-skip is still fine because the substituted default (Line 708-709) is developer-controlled, but the "empty default" rationale is now inaccurate and could mislead future readers. Consider updating that comment.
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@tensorrt_llm/_torch/visual_gen/models/cosmos3/pipeline_cosmos3.py` around
lines 42 - 49, Update the stale comment in pipeline_cosmos3.py near the
negative-prompt handling in the Cosmos3 pipeline so it no longer says the
default is empty. The logic around the negative_prompt check in the relevant
method (where None is skipped and COSMOS3_DEFAULT_NEGATIVE_PROMPT is
substituted) can stay the same, but the comment should accurately describe that
a developer-controlled default prompt is used instead of an empty one.
Member
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Closing this repair-bot fix — the proposed revert of the three Cosmos3 audio-output changes (per-batch cross-attn slicing, COSMOS3_DEFAULT_NEGATIVE_PROMPT, max_sequence_length 1024→4096) is not the correct fix for the test_cosmos3_nano_t2i_lpips_against_golden regression. The failing test is tracked under https://nvbugs/6418815 (nvbugs/6435113 marked as a duplicate). A proper fix will be handled there. |
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