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.
compilation_failure_closes_chips
Set the configuration whether
we want to close TPU chips when there is a compilation failure.
tpu_cancellation_closes_chips
Set the configuration whether
we want to close TPU chips when a TPU execution is cancelled. If the value
is None, the behavior will be determined by the command line flag
tpu_cancellation_closes_chips for the TPU worker. WARNING: this argument
only applies to TFRT TPU runtime.
Returns
A serialized TopologyProto that describes the TPU system. Note:
the topology must be evaluated using Session.run before it can be used.