message: Disable writing examples/sec and global_step/sec summaries on TPU if save_summary_steps is Falsey.
diff: @@ -2654,7 +2654,7 @@ class TPUEstimator(estimator_lib.Estimator):
  if self._log_every_n_steps is not None:
  examples_hook = ExamplesPerSecondHook(
  ctx.global_batch_size,
  - output_dir=self.model_dir,
  + output_dir=self.model_dir if config.save_summary_steps else None,
  every_n_steps=self._log_every_n_steps)
  if ctx.is_running_on_cpu(is_export_mode=is_export_mode):
  