tf.contrib.distribute.AllReduceCrossDeviceOps

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Reduction using all-reduce.

Inherits From: CrossDeviceOps

tf.contrib.distribute.AllReduceCrossDeviceOps(
    all_reduce_alg='nccl', num_packs=1, agg_small_grads_max_bytes=0,
    agg_small_grads_max_group=10
)

all_reduce_alg the all-reduce algorithm to use, currently only "nccl" or "hierarchical_copy" are supported.
num_packs see above.
agg_small_grads_max_bytes see above.
agg_small_grads_max_group see above.

Methods

batch_reduce

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batch_reduce(
    reduce_op, value_destination_pairs
)

Reduce PerReplica objects in a batch.

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

Args
reduce_op Indicates how per_replica_value will be reduced. Accepted values are tf.distribute.ReduceOp.SUM, tf.distribute.ReduceOp.MEAN.
value_destination_pairs a list or a tuple of tuples of PerReplica objects (or tensors with device set if there is one device) and destinations.

Returns
a list of Mirrored objects.

Raises
ValueError if value_destination_pairs is not a list or a tuple of tuples of PerReplica objects and destinations

broadcast

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broadcast(
    tensor, destinations
)

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(
    reduce_op, per_replica_value, destinations
)

Reduce per_replica_value to destinations.

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

Args
reduce_op Indicates how per_replica_value will be reduced. Accepted values are tf.distribute.ReduceOp.SUM, tf.distribute.ReduceOp.MEAN.
per_replica_value a PerReplica object or a tensor with device set.
destinations the reduction destinations.

Returns
a Mirrored object.

Raises
ValueError if per_replica_value can't be converted to a PerReplica object.