Ensure sync across val/test step when using DDP #371
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What does this PR do?
Fixes Lightning-AI/pytorch-lightning#4693
Lightning behaviour assumes that if no
monitor
key is passed to the checkpoint function, to assumeval_loss
orcheckpoint_on
as the key to save top k models. This means we have to ensure that this is synced correctly on all processes so that they are in sync when tracking the best models.PR review
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