title: Training Keras Model : Graph Execution Error (callbacks = callbacks)
body: <p>Following the Deep Learning Cookbook, for voice recognition. On the last step, when the epochs start, the following code is breaking at callbacks = callbacks:</p>
  <pre><code>history = model.fit_generator(
   generator=batch_generator(X_train, batch_size),
   steps_per_epoch=steps_per_epoch,
   epochs=n_epochs,
   verbose=1,
   validation_data=batch_generator(X_val, 32),
   validation_steps=5,
   callbacks=callbacks
   )
  </code></pre>
  <p><a href="https://i.stack.imgur.com/zziYH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zziYH.png" alt="enter image description here" /></a></p>