num_proc=0 behave like None, num_proc=1 uses one worker (not main process) and clarify num_proc documentation#7702
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lhoestq merged 10 commits intohuggingface:mainfrom Jul 31, 2025
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I think we can support num_proc=0 and make it equivalent to |
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Thank you @lhoestq for reviewing it. Please let me know if anything needs to be updated further. |
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Fixes issue #7700
This PR makes num_proc=0 behave like None in Dataset.map(), disabling multiprocessing.
It improves UX by aligning with DataLoader(num_workers=0) behavior.
The num_proc docstring is also updated to clearly explain valid values and behavior.
@SunMarc