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Builds a training loop for TPUs.

The set of loop-carried tensors corresponds to inputs. Both condition and body take the current value of the loop-carried tensors. 'body' additionally takes a tuple of infeed from infeed_queue if infeed_queue is not None. condition must return a single boolean value that determines whether iteration continues. body must return an updated list of values for the loop-carried tensors.

condition a Python function that builds the loop condition.
body a Python function that builds the loop body.
inputs a list of initial values passed into the training loop, or None (equivalent to an empty list).
infeed_queue if not None, the infeed queue from which to append a tuple of arguments as inputs to condition.
name (Deprecated) Does nothing.

The final values of the loop-carried tensors.

TypeError if body or condition has the wrong signature.