fix(dataset): make torchcodec cache fork-safe for num_workers>0#3327
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AjAnubolu wants to merge 1 commit intohuggingface:mainfrom
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fix(dataset): make torchcodec cache fork-safe for num_workers>0#3327AjAnubolu wants to merge 1 commit intohuggingface:mainfrom
AjAnubolu wants to merge 1 commit intohuggingface:mainfrom
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…>0 (huggingface#1488) Signed-off-by: AjAnubolu <anuboluajay@gmail.com>
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Summary
The module-level
_default_decoder_cacheinherited stale fsspec/libav state acrossfork(), breaking the torchcodec backend under DataLoader workers (the dominant__getitem__cost for SmolVLA / Diffusion Policy training). Stamps the cache withos.getpid()and self-resets on first access in a forked child; adds an opt-inlerobot_worker_init_fnhelper.Closes #1488. Complements #3123 (action tokenization perf).