Does W&B use the `multiprocessing` library?

Yes, W&B uses the multiprocessing library. An error message like the following indicates a possible issue:

An attempt has been made to start a new process before the current process 
has finished its bootstrapping phase.

To resolve this, add an entry point protection with if __name__ == "__main__":. This protection is necessary when running W&B directly from the script.

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Experiments