title: Not able to see histograms and distributions in TensorBoard configured as a callback from Keras
body: <p>The TensorBoard call back itself seems to work ok! I am able to see the Graph and events (loss and accuracy charts).
  I am not able to see histograms and distributions though.
  histogram_freq is set to 1.
  And callback looks somewhat like below...</p>
  
  <pre><code>keras.callbacks.TensorBoard(log_dir='/path/to/logs', histogram_freq=1, write_graph=True, write_images=True)
  </code></pre>
  
  <p>Thanks in advance!</p>