code: public org.tensorflow.framework.StepStats getStepStats() {
      return stepStats_ == null ? org.tensorflow.framework.StepStats.getDefaultInstance() : stepStats_;
    }
docs: <pre>
  If the request asked for execution stats or cost graph, these are returned
  here.
  </pre>
  
  <code>optional .tensorflow.StepStats step_stats = 2;</code>