title: Using the Tensorflow profiler with tf.Estimator
body: <p>I need to use the Tensorflow profiler to profile some code that is running slowly for some reason. Unfortunately, the code in question uses tf.Estimator, so I can't figure out how to inject the run metadata object into the session run() call in order to get the information that the profiler needs.</p>
  
  <p>What should I do?</p>