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[Puzzletron] Reuse existing subblock stats when resuming a run - #2555
aasim-syed wants to merge 4 commits into
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Restarting a Puzzletron run failed at step 5 because calculate_subblock_stats_for_puzzle_dir raised when subblock_stats.json already existed. The file is written only after all stats are computed, so reuse it instead, matching how activation scoring and one-block scoring already resume. The check now runs before loading the teacher. Fixes the restart failure reported in NVIDIA#1668. Signed-off-by: aasim syed <syedaasim133@gmail.com>
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Included review availability: This review used your included allowance. Your plan provides up to 12 included reviews per hour; 10 remain after this review. 📝 WalkthroughWalkthroughWhen the statistics file exists and merging is disabled, the function logs a skip and returns. Completed statistics are written to a temporary file and replace the destination. A unit test checks that an existing file remains unchanged. ChangesExisting Subblock Statistics
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~8 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to Existing statistics can be reused on resume, and interrupted writes no longer replace the completed file. No actionable merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 5 | ❌ 1❌ Failed checks (1 warning)
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Inline comments:
In @modelopt/torch/puzzletron/subblock_stats/calc_subblock_stats.py:
- Around line 283-284: Update the write path in calc_subblock_stats so the
completed statistics JSON is written to a temporary file and atomically replaces
subblock_stats_file; keep the existence guard from treating an interrupted
partial write as completed statistics.
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modelopt/torch/puzzletron/subblock_stats/calc_subblock_stats.pytests/unit/torch/puzzletron/test_calc_subblock_stats.py
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Write subblock_stats.json to a temporary file and rename it into place, so an interrupted write cannot leave a partial file that a resumed run would then reuse. Signed-off-by: aasim syed <syedaasim133@gmail.com>
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Hi @grzegorz-k-karch @j-rausch , gentle ping on this PR when you get a chance. It's rebased, has no conflicts, and the unit tests in tests/unit/torch/puzzletron/test_calc_subblock_stats.py cover the resume path. Happy to make any changes you'd like. Could someone also trigger the full CI? Thanks! |
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What does this PR do?
Type of change: Bug fix
Restarting a Puzzletron run (e.g. after a node dies during step 6) fails at step 5 with:
Other steps already resume: activation scoring skips when complete, and one-block scoring skips existing solutions (
skip_existing_solutions: truein all example configs). Subblock stats was the only step that raised instead. The only workaround was deletingsubblock_stats.jsonand recomputing it.With this fix,
calculate_subblock_stats_for_puzzle_dirreuses an existing stats file whenmerge_with_existing_statsis false, and the check now runs before the teacher config and subblock configs are loaded. To make reuse safe, the stats file is now written to a temporary file and atomically renamed into place once every combination finishes, so an existingsubblock_stats.jsonalways comes from a completed computation.merge_with_existing_stats: truebehaves as before.Addresses the first failure reported in #1668. The issue's other points (step 2 conversion rerunning, and step 6 results appearing lost after the stats file was deleted by hand) are left for follow-up.
Usage
Testing
tests/unit/torch/puzzletron/test_calc_subblock_stats.py. It passes with the fix and fails onmainwith theValueErrorabove. I ran it on Linux (WSL, Python 3.12, CPU torch 2.14) becausetests/unit/torch/puzzletronis skipped on Windows.pre-commit runon the changed files.Before your PR is "Ready for review"
merge_with_existing_stats: trueis unchanged)CONTRIBUTING.md: N/AAdditional Information
Related: #1668
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