message: Write out the Keras model configuration in TensorBoard callback.
diff: @@ -1209,6 +1209,8 @@ class TensorBoard(Callback):
  with self._train_writer.as_default():
  with summary_ops_v2.always_record_summaries():
  summary_ops_v2.graph(K.get_graph())
  + if self.model._is_graph_network: # pylint: disable=protected-access
  + summary_ops_v2.keras_model('keras', self.model, step=0)
  def _close_writers(self):
  """Close all remaining open file writers owned by this callback.
  