title: Keras: How to use fit_generator with multiple outputs of different type
body: <p>In a Keras model with the Functional API I need to call fit_generator to train on augmented images data using an ImageDataGenerator.<br />
  The problem is my model has two outputs: the mask I'm trying to predict and a binary value.<br />
  I obviously only want to augment the input and the mask output and not the binary value.<br />
  How can I achieve this?</p>