[Small] Disable summary for non-master processes in DDP training mode #954
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Description
Similar to only having process 0 (master process) writing checkpoint, we want to have only process 0 writing the summary. This is done by not enabling summary unless the process rank is 0 (or -1) when setting up
PolicyTrainer
.Testing
Tested training in dual GPU settings with this PR. There are still 2 events file generated but only one is being written to.