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A container that holds a list of values, one value per worker.
tf.distribute.experimental.coordinator.PerWorkerValues( values )
tf.distribute.experimental.coordinator.PerWorkerValues contains a collection
of values, where each of the values is located on its corresponding worker,
and upon being used as one of the
value specific to a worker will be passed into the function being executed at
that corresponding worker.
Currently, the only supported path to create an object of
tf.distribute.experimental.coordinator.PerWorkerValues is through calling
iter on a
distributed dataset instance. The mechanism to create a custom
tf.distribute.experimental.coordinator.PerWorkerValues is not yet supported.