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[https://nvbugs/6357628][fix] Pin params.seed=42 in wan_t2v.py; add per_dimension_tolerances to… #15682

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[https://nvbugs/6357628][fix] Pin params.seed=42 in wan_t2v.py; add per_dimension_tolerances to… #15682

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2 changes: 2 additions & 0 deletions examples/visual_gen/models/wan_t2v.py
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,8 @@ def main():
params.height = 480
params.width = 832
params.num_frames = 165
# Pinned seed so VBench accuracy tests are deterministic (see nvbugs/6357628).
params.seed = 42

output = visual_gen.generate(
inputs="A cute cat playing piano",
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22 changes: 18 additions & 4 deletions tests/integration/defs/examples/visual_gen/test_visual_gen.py
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
import json
import os
import random
import shutil
import subprocess
import sys
import time
Expand Down Expand Up @@ -201,8 +202,10 @@ def _visual_gen_deps(llm_venv):
llm_venv.run_cmd(["-m", "pip", "install", "av"])
llm_venv.run_cmd(["-m", "pip", "install", "diffusers>=0.37.0"])
# Install ffmpeg system package required by save_video() for MP4 encoding
check_call(["apt-get", "update", "-y"], shell=False)
check_call(["apt-get", "install", "-y", "ffmpeg"], shell=False)
if shutil.which("ffmpeg") is None:
sudo = ["sudo"] if os.getuid() != 0 else []
check_call(sudo + ["apt-get", "update", "-y"], shell=False)
check_call(sudo + ["apt-get", "install", "-y", "ffmpeg"], shell=False)


@pytest.fixture(scope="session")
Expand Down Expand Up @@ -958,6 +961,9 @@ def test_vbench_dimension_score_wan(vbench_repo_root, wan21_bf16_video_path, llm
"""Run VBench on WAN 2.1 BF16 video generated with the LPIPS config."""
videos_dir = os.path.dirname(wan21_bf16_video_path)
assert os.path.isfile(wan21_bf16_video_path), "WAN 2.1 BF16 video must exist"
# dynamic_degree is binary (0/1) and aesthetic/imaging quality swing 0.15-0.25 across
# seeds even at fixed seed; widen those bands so the test asserts on the dimensions
# that are stable. See nvbugs/6357628 for analysis.
_run_vbench_and_report(
vbench_repo_root,
videos_dir,
Expand All @@ -966,6 +972,11 @@ def test_vbench_dimension_score_wan(vbench_repo_root, wan21_bf16_video_path, llm
title="WAN 2.1 BF16",
golden_scores=VBENCH_WAN_GOLDEN_SCORES,
max_score_diff=0.05,
per_dimension_tolerances={
"dynamic_degree": 1.0,
"aesthetic_quality": 0.25,
"imaging_quality": 0.25,
},
)


Expand All @@ -977,6 +988,7 @@ def _run_vbench_and_report(
title,
golden_scores=None,
max_score_diff=0.10,
per_dimension_tolerances=None,
):
"""Run VBench, print scores, and optionally assert against golden values.

Expand Down Expand Up @@ -1044,10 +1056,12 @@ def _run_vbench_and_report(
max_diff_val = max(abs(scores_trtllm[d] - golden_scores[d]) for d in VBENCH_DIMENSIONS)
print(f"max_diff={max_diff_val:.4f} (threshold={max_score_diff})")
print("=" * len(header) + "\n")
tolerances = per_dimension_tolerances or {}
for dim in VBENCH_DIMENSIONS:
diff = abs(scores_trtllm[dim] - golden_scores[dim])
assert diff < max_score_diff or scores_trtllm[dim] >= golden_scores[dim], (
f"Dimension '{dim}' score difference {diff:.4f} >= {max_score_diff} "
dim_threshold = tolerances.get(dim, max_score_diff)
assert diff < dim_threshold or scores_trtllm[dim] >= golden_scores[dim], (
f"Dimension '{dim}' score difference {diff:.4f} >= {dim_threshold} "
Comment on lines +1059 to +1064

@coderabbitai coderabbitai Bot Jun 27, 2026

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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win

Allow the full binary dynamic_degree swing.

Line 1136 still uses a strict <. With per_dimension_tolerances["dynamic_degree"] = 1.0, a golden score of 1.0 and observed score of 0.0 still fail because 1.0 < 1.0 is false. That leaves the WAN test flaky on the exact 0↔1 case this PR is trying to tolerate.

Proposed fix 
-        assert diff < dim_threshold or scores_trtllm[dim] >= golden_scores[dim], (
+        assert diff <= dim_threshold or scores_trtllm[dim] >= golden_scores[dim], (
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
tolerances = per_dimension_tolerances or {}
for dim in VBENCH_DIMENSIONS:
diff = abs(scores_trtllm[dim] - golden_scores[dim])
assert diff < max_score_diff or scores_trtllm[dim] >= golden_scores[dim], (
f"Dimension '{dim}' score difference {diff:.4f} >= {max_score_diff} "
dim_threshold = tolerances.get(dim, max_score_diff)
assert diff < dim_threshold or scores_trtllm[dim] >= golden_scores[dim], (
f"Dimension '{dim}' score difference {diff:.4f} >= {dim_threshold} "
tolerances = per_dimension_tolerances or {}
for dim in VBENCH_DIMENSIONS:
diff = abs(scores_trtllm[dim] - golden_scores[dim])
dim_threshold = tolerances.get(dim, max_score_diff)
assert diff <= dim_threshold or scores_trtllm[dim] >= golden_scores[dim], (
f"Dimension '{dim}' score difference {diff:.4f} >= {dim_threshold} "
🤖 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 `@tests/integration/defs/examples/visual_gen/test_visual_gen.py` around lines
1132 - 1137, The tolerance check in the visual generation test still rejects
exact boundary changes for dynamic_degree because it uses a strict less-than
comparison. Update the assertion in the VBENCH_DIMENSIONS loop in
test_visual_gen.py so the per-dimension tolerance allows equality at the
threshold, preserving the existing “or scores_trtllm[dim] >= golden_scores[dim]”
behavior while making the 0↔1 dynamic_degree swing pass when
per_dimension_tolerances["dynamic_degree"] is 1.0.

Source: Path instructions

f"(TRT-LLM={scores_trtllm[dim]:.4f}, golden={golden_scores[dim]:.4f})"
)
return scores_trtllm
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