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Returns the current tf.distribute.Strategy if in a cross-replica context.
tf.contrib.distribute.get_cross_replica_context()
DEPRECATED: Please use in_cross_replica_context() and
get_strategy() instead.
Returns:
Returns the current tf.distribute.Strategy object in a cross-replica
context, or None.
Exactly one of get_replica_context() and get_cross_replica_context()
will return None in a particular block.