Why does my process stop responding when using Hydra with W&B?

This page explains how to resolve unresponsive processes that occur when you start a process with Hydra alongside W&B. If your process stops responding when you start it with Hydra, the likely cause is a multiprocessing conflict between Hydra and W&B.

To fix this, change W&B’s multiprocessing protocol to "thread". This avoids the conflict so your process can start cleanly. You can do this in one of two ways:

Pass a settings parameter to wandb.init

wandb.init(settings=wandb.Settings(start_method="thread"))

Set a global environment variable

export WANDB_START_METHOD=thread

For more information, see the Hydra integration guide and Distributed training troubleshooting.

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