Don't init dist when world_size is 1 #311
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jbloxham
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Jan 31, 2022
Co-authored-by: ravi-mosaicml <ravi@mosaicml.com>
A-Jacobson
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Feb 10, 2022
* cleanup dist init * specify node rank * rewrite _get_distributed_config_var for better error handling * change a warning to an error * woops * dummy commit to trigger jenkins * Update composer/utils/dist.py Co-authored-by: ravi-mosaicml <ravi@mosaicml.com> * woops * remove print statement Co-authored-by: ravi-mosaicml <ravi@mosaicml.com>
coryMosaicML
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Feb 23, 2022
* cleanup dist init * specify node rank * rewrite _get_distributed_config_var for better error handling * change a warning to an error * woops * dummy commit to trigger jenkins * Update composer/utils/dist.py Co-authored-by: ravi-mosaicml <ravi@mosaicml.com> * woops * remove print statement Co-authored-by: ravi-mosaicml <ravi@mosaicml.com>
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The distributed process group doesn't necessarily need to be initialized when we're doing single-process training, and this can help avoid crashes in certain environments. Note that the DDP initialization code already is a no-op when the distributed process group is not initialized.
Tested by running models with various world sizes (and no explicit world size), and using a print statement to verify whether the model was the original model class or a DDP wrapper.