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Evaluate saved pruned text and VLM checkpoints - #2280

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Evaluate saved pruned text and VLM checkpoints#2280
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@j-rausch j-rausch commented Aug 28, 2026

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What does this PR do?

Saved pruned checkpoints must still work after another process reloads them. This PR adds one shared evaluation step for text and VLM and runs it after materialization and after knowledge distillation.

Type of change: new feature, tests, and documentation

  • The evaluator passes the saved checkpoint path directly to lmms-eval and reports benchmark failures.
  • Materialized checkpoints use the Hugging Face directory format while retaining AnyModel architecture metadata. Distillation writes another consolidated Hugging Face-format checkpoint; it does not implicitly convert the model to a native AutoModel architecture. Both use the same evaluation path.
  • The bounded text and VLM smoke workflows run two IFEval or RealWorldQA samples before and after distillation with the same settings.
  • Lifecycle checks verify physical pruning, safetensors, the checkpoint path given to lmms-eval, two completed samples, and finite metrics.

Teacher comparison is separate. Run the teacher with the same task version, data, prompt, and limits, then compare its metrics with the student results.

Usage

Use full_smoke.yaml for text or full_vlm_smoke.yaml for VLM. Each workflow runs checkpoint_eval after materialization and post_kd_checkpoint_eval after distillation. Setup and artifact paths are documented in examples/puzzletron/docs/post_mip_pipeline.md and the modality smoke guides.

Testing

  • 35 focused evaluator, runner, profile, and text/VLM plan tests pass; both manual GPU lifecycle tests collect successfully.
  • One-GPU runs reloaded physically pruned text and VLM checkpoints before and after distillation, completed two samples per modality, and returned finite metrics. The GPU lifecycle was not rerun after moving the unchanged evaluator into its package-level module; focused tests cover that import and adapter path.
  • Formatting, typing, security, YAML, Markdown, and license hooks pass.

The two-sample runs prove checkpoint reload and benchmark completion, not model accuracy.

Before your PR is "Ready for review"

  • Is this change backward compatible?: yes
  • If you copied code from another source or added a dependency, did you follow the contributor guidance?: N/A; no copied code or new repository dependency
  • Did you write necessary tests?: yes
  • Did you update the changelog?: N/A; this is example and test integration
  • Did you get Claude approval on this PR?: N/A

Signed-off-by: Johannes Rausch <jrausch@nvidia.com>
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📝 Walkthrough

Walkthrough

The PR adds configurable checkpoint evaluation to Qwen 3.5 language and VLM smoke pipelines. It evaluates materialized and post-distillation checkpoints, routes VLM evaluation through a RealWorldQA profile, validates results, updates smoke tests, and documents the lifecycle.

Changes

Checkpoint evaluation lifecycle

Layer / File(s) Summary
Evaluation registry and VLM adapter
modelopt/torch/puzzletron/post_mip/runner.py, examples/puzzletron/evaluation/vlm/*, examples/puzzletron/run_post_mip_node.py, tests/unit/torch/puzzletron/evaluation/vlm/*, tests/unit/torch/puzzletron/test_post_mip_runner.py
Named downstream evaluators can be registered and selected. The VLM adapter runs the pinned realworldqa-smoke profile and returns benchmark data.
Full-smoke checkpoint stages
examples/puzzletron/configs/families/qwen3_5/qwen3p5_0p8b/runs/*, examples/puzzletron/configs/orchestration/qwen3p5_0p8b/*, tests/unit/torch/puzzletron/test_qwen3p5_0p8b_full_*
Language and VLM pipelines evaluate checkpoints before serving and after distillation. Serving and final evaluation consume the evaluated checkpoints.
Lifecycle validation
tests/_test_utils/torch/puzzletron/checkpoint_evaluation.py, tests/gpu/torch/puzzletron/test_qwen3p5_0p8b_*
Tests verify checkpoint artifacts, checkpoint identity, sample limits, finite metrics, offline benchmark setup, and pre- and post-distillation evaluations.
Evaluation workflow documentation
examples/puzzletron/README.md, examples/puzzletron/docs/*
Documentation describes saved-checkpoint evaluation, pinned benchmark data, workflow budgets, acceptance evidence, and checkpoint loading.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: 🔵 Low · up to f29ba

The PR adds shared checkpoint evaluation for text and VLM workflows, but the VLM evaluation package export pattern still needs owner follow-up to ensure its public APIs are exposed consistently to downstream users. The change is otherwise mergeable with that bounded integration risk acknowledged.

Sequence Diagram(s)

sequenceDiagram
  participant Pipeline
  participant PostMIPRunner
  participant VLMProfile
  participant Evaluator
  participant RealWorldQA
  Pipeline->>PostMIPRunner: submit checkpoint_eval
  PostMIPRunner->>VLMProfile: resolve qwen35_vlm_realworldqa
  VLMProfile->>Evaluator: evaluate checkpoint
  Evaluator->>RealWorldQA: run realworldqa-smoke
  RealWorldQA-->>Evaluator: return metrics
  Evaluator-->>PostMIPRunner: return evaluation result
  PostMIPRunner-->>Pipeline: provide evaluated checkpoint
Loading

Suggested reviewers: separius

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Docstring Coverage ⚠️ Warning Docstring coverage is 25.71% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 35 functions across 15 files. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (5 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly and concisely summarizes the primary change: evaluating saved pruned text and VLM checkpoints.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
Security Anti-Patterns ✅ Passed No listed security anti-pattern was introduced. The full PR diff adds no torch.load(..., weights_only=False), numpy.load(..., allow_pickle=True), eval()/exec(), or # nosec usage. No dependen…
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No listed security anti-pattern was introduced. The full PR diff adds no torch.load(..., weights_only=False), numpy.load(..., allow_pickle=True), eval()/exec(), or # nosec usage. No dependency manifest changed. The only trust_remote_code=True occurrence is in an existing unit-test fixture; production code reads this setting through require_boolean_policy with a default of False, and the PR does not add a hardcoded True.

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In `@examples/puzzletron/evaluation/vlm/run.py`:
- Around line 124-130: Add __all__ = ["evaluate"] to the module containing
evaluate, and create the vlm package initializer to re-export its public symbols
via the existing run module. Ensure post_mip.py can import evaluate through the
package without changing evaluate’s implementation.

In `@tests/gpu/torch/puzzletron/test_qwen3p5_0p8b_smoke.py`:
- Around line 117-124: Update the expectation-loading logic in the smoke test to
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  • examples/puzzletron/README.md
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❌ Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.20%. Comparing base (8b37da4) to head (f29bac5).

Files with missing lines Patch % Lines
modelopt/torch/puzzletron/post_mip/runner.py 0.00% 13 Missing ⚠️
Additional details and impacted files
@@                    Coverage Diff                    @@
##           feature/puzzletron_v2    #2280      +/-   ##
=========================================================
+ Coverage                  50.81%   51.20%   +0.39%     
=========================================================
  Files                        709      709              
  Lines                      92390    92402      +12     
=========================================================
+ Hits                       46945    47314     +369     
+ Misses                     45445    45088     -357     
Flag Coverage Δ
puzzletron 29.28% <0.00%> (-0.01%) ⬇️
regression 8.89% <0.00%> (?)
unit 29.26% <0.00%> (-0.01%) ⬇️

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Signed-off-by: Johannes Rausch <jrausch@nvidia.com>
Signed-off-by: Johannes Rausch <jrausch@nvidia.com>

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In `@examples/puzzletron/evaluation/vlm/__init__.py`:
- Around line 22-34: Document an approved exception for the lazy evaluate export
implemented by __getattr__ in the VLM package, noting that run.py remains the
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Comment thread examples/puzzletron/evaluation/vlm/__init__.py Outdated
Expose the reusable evaluator from a non-CLI module so package imports follow the public API convention without preloading the documented module entry point. Normalize optional post-MIP mappings before profile registration.

Signed-off-by: Johannes Rausch <jrausch@nvidia.com>

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In `@examples/puzzletron/run_post_mip_node.py`:
- Around line 33-39: Update _register_evaluation_profiles to skip null or
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the existing handling of null post_mip, flows, nodes, and node config values.
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In `@examples/puzzletron/run_post_mip_node.py`:
- Around line 35-36: In the profile collection logic of run_post_mip_node.py,
validate config.profile before adding it to profiles and add only string values,
excluding empty lists, mappings, and other non-string values that would be
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config.profile set to [] or {} and confirm post-MIP execution starts without
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