message: Fixed TPU distribution to be compatible with python3.
diff: @@ -513,7 +513,7 @@ def experimental_tpu_test_loop(model,
  # workaround until new metrics are in place.
  reduce_op = ds_reduce_util.ReduceOp.MEAN
  output_tensors[label] = current_strategy.reduce(reduce_op, output)
  - test_op = control_flow_ops.group(output_tensors.values())
  + test_op = control_flow_ops.group(list(output_tensors.values()))
  if verbose >= 1:
  progbar = Progbar(target=steps)
  