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Initializes a distributed TPU system for use with TensorFlow.

embedding_config If not None, a TPUEmbeddingConfiguration proto describing the desired configuration of the hardware embedding lookup tables. If embedding_config is None, no hardware embeddings can be used.
job The job (the XXX in TensorFlow device specification /job:XXX) that contains the TPU devices that will be initialized. If job=None it is assumed there is only one job in the TensorFlow flock, and an error will be returned if this assumption does not hold.

A serialized TopologyProto that describes the TPU system. Note: the topology must be evaluated using before it can be used.