[Disco] Implement num_workers property for disco.Session
#16978
Merged
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Prior to this commit, while the
num_workersargument was provided to thedisco.Sessionobject, it could not be determined from an existingdisco.Sessionobject. As a result, functions that interacted with a multi-GPU setup frequently required separatenum_workersanddisco_sessionargument, which could erroneously be out-of-sync (e.g. passing the incorrectnum_workers, or omitting thedisco_sessionargument whennum_workers>1).To remove this class of errors, this commit adds a
disco.Session.num_workersproperty. The separatenum_workersargument is no longer necessary, as it can be determined from thedisco.Sessioninstance.