tf.distribute.CrossDeviceOps

Base class for cross-device reduction and broadcasting algorithms.

Methods

batch_reduce

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Reduce PerReplica objects in a batch.

Reduce each first element in value_destination_pairs to each second element which indicates the destinations.

This can be faster than multiple individual reduces because we can fuse several tensors into one or multiple packs before reduction.

Args
reduce_op An instance of tf.distribute.ReduceOp that indicates how the per_replica_value will be reduced.
value_destination_pairs A list or a tuple of PerReplica objects (or tensors with device set if there is one device) and destinations.
experimental_hints A tf.distrbute.experimental.CollectiveHints. Hints to perform collective operations.

Returns
a list of Mirrored objects.

Raises
ValueError if value_destination_pairs is not an iterable of tuples of PerReplica objects and destinations.

batch_reduce_implementation

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Implementation of reduce PerReplica objects in a batch.

Overriding this method is useful for subclass implementers.

Reduce each first element in value_destination_pairs to each second element which indicates the destinations.

Args
reduce_op An instance of tf.distribute.ReduceOp that indicates how per_replica_value will be reduced.
value_destination_pairs An iterable of tuples of PerReplica objects (or tensors with device set if there is one device) and destinations.
experimental_hints A tf.distrbute.experimental.CollectiveHints. Hints to perform collective operations.

Returns
a list of Mirrored objects.

Raises
ValueError if value_destination_pairs is not an iterable of tuples of PerReplica objects and destinations

broadcast

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Broadcast the tensor to destinations.

Args
tensor the tensor to broadcast.
destinations the broadcast destinations.

Returns
a Mirrored object.

broadcast_implementation

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Implementation of broadcast the tensor to destinations.

Args
tensor the tensor to broadcast.
destinations the broadcast destinations.

Returns
a Mirrored object.

reduce

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Reduce per_replica_value to destinations.

It runs the reduction operation defined by reduce_op and put the result on