Reland "Implement load_into for Mmap Data Loader"#11935
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GregoryComer merged 2 commits intopytorch:mainfrom Jun 24, 2025
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Reland "Implement load_into for Mmap Data Loader"#11935GregoryComer merged 2 commits intopytorch:mainfrom
GregoryComer merged 2 commits intopytorch:mainfrom
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11935
Note: Links to docs will display an error until the docs builds have been completed. ⏳ No Failures, 1 PendingAs of commit 5815291 with merge base 91c9ffa ( This comment was automatically generated by Dr. CI and updates every 15 minutes. |
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### Summary - Adds `load_into()` to support memory mapped loading directly into the caller's buffer. - Enables copying a specific byte range from the file without creating an internal buffer. - Resuses input validation from `load()`. Fixes pytorch#11561 ### Test plan - Added unit tests to `MmapDataLoaderTest` for `load_into()` to validate copying for both aligned and offset data. - All Mmap Data Loader tests pass via: ``` ./build-ninja/extension/data_loader/test/extension_data_loader_test --gtest_filter='MmapDataLoaderTest.*' ``` - Full set of Data Loader tests pass via: ``` ./build-ninja/extension/data_loader/test/extension_data_loader_test ```
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Summary
#11654 was reverted in #11928 due to a Meta-internal build breakage. This PR re-lands the changes along with a fix for the variable name shadowing. I will update OSS CI to run with -Wshadow enabled as a follow-up to catch this in GitHub in the future.