title: save and load keras.callbacks.History
body: <p>I'm training a deep neural net using Keras and looking for a way to save and later load the history object which is of <code>keras.callbacks.History</code> type. Here's the setup:</p>
  
  <pre><code>history_model_1 = model_1.fit_generator(train_generator,
                            steps_per_epoch=100,
                            epochs=20,
                            validation_data=validation_generator,
                            validation_steps=50)
  </code></pre>
  
  <p><code>history_model_1</code> is the variable I want to be saved and loaded during another Python session.  </p>