Add num_proc to from_csv/generator/json/parquet/text
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The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_5239). All of your documentation changes will be reflected on that endpoint.
2022-11-14T14:58:08Z
https://github.com/huggingface/datasets/pull/5239#issuecomment-1313884935
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MEMBER
I ended up moving `num_proc` to `AbstractDatasetReader.__init__` :)

Let me know if it sounds good to you now
2022-11-29T15:37:34Z
https://github.com/huggingface/datasets/pull/5239#issuecomment-1330840068
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Allow multiprocessing to from_* methods