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Indicates when a distributed variable will be synced.
AUTO
: Indicates that the synchronization will be determined by the currentDistributionStrategy
(eg. WithMirroredStrategy
this would beON_WRITE
).NONE
: Indicates that there will only be one copy of the variable, so there is no need to sync.ON_WRITE
: Indicates that the variable will be updated across devices every time it is written.ON_READ
: Indicates that the variable will be aggregated across devices when it is read (eg. when checkpointing or when evaluating an op that uses the variable).