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Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe checkpoint backward path now clears gradients from detached recomputation inputs. A regression test verifies gradient release and expected input gradients. The GPU workflow and testing documentation include the new coverage. ChangesCheckpoint gradient cleanup
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Suggested reviewers: Merge Risk: ⚪ Minimal · up to The regression test exercises gradient cleanup and verifies the original input gradients; the GPU workflow and testing documentation include the coverage. No actionable merge risk remains. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change releases temporary gradients after preserving the gradients returned to the original inputs. The covered training path behaves as intended, but compatibility with sharded-training hooks is not fully established. Retained concerns Security review detailsSecurity Blast Radius
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In @.github/workflows/gpu_unit_tests.yml:
- Line 173: Update the documentation describing GPU CI coverage to include the
distributed gradient-checkpointing test invoked by the workflow command in the
pytest step. Keep the documentation’s existing structure and terminology, and
modify only the relevant documentation or configuration example.
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.github/workflows/gpu_unit_tests.ymltests/distributed/test_gradient_checkpointing.pyveomni/distributed/checkpoint.py
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ZHAO-YIFENG
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Merge szl.omniv2-1065-offline-encoding-mixin-v1 at 90ba56e, the head of #1211. The branch sits on main after #1235, so this also brings in #1204, #1221 and #1169 from main. omniv2 already contains #1235 through its unsquashed 1064 branch (083161d), whose tree matches the squash for every SeedOmni file. The merge was therefore resolved against 083161d instead of the true merge base: only the changes in 083161d..90ba56e are applied. Merging from the old base would have re-added code that omniv2 deleted after the 1064 merge (e.g. ConversationItem.source) without a conflict. Conflict resolution: - mixins/offline_encoding_mixin.py: take #1211. cache_mode becomes a constructor kwarg kept on the instance; derive_cache_mode, patch_config, RUNTIME_CONFIG_KEYS and the partial-checkpoint hooks are gone. omniv2's callers are ported in the next commit. - seed_omni/__init__.py, mixins/__init__.py: keep omniv2, which also exports MetricMeterMixin; the OfflineEncodingMixin export is the same on both sides.
What does this PR do?
Release gradients attached to the detached input leaves created during reentrant activation-checkpoint recomputation.
The gradients are first captured for return to the outer autograd graph, then the temporary leaves have their
.gradreferences cleared. This prevents retained recomputation graphs or saved-variable references from keeping an additional stale input-gradient buffer alive across iterations.Related upstream reports:
Checklist Before Starting
[{modules}] {type}: {description}format.Test
pytest -q tests/distributed/test_gradient_checkpointing.py: 6 passed..gradremained empty; allocated memory grew by 64 MiB per step.API and Usage Example
No API or configuration changes.
Design & Code Changes
CheckpointFunction.backward..gradon the temporary detached input leaves after capture.Checklist Before Submitting
Summary by CodeRabbit
Bug Fixes
Tests
Documentation