title: What is the difference between tf.keras.layers versus tf.layers?
body: <p>What is the difference between tf.keras.layers versus tf.layers?<br>
  E.g. both of them have Conv2d, do they provide different outputs?<br>
   Is there any benefits if you mix them (something like a tf.keras.layers.Conv2d in one hidden layer and in the next, tf.layers.max_pooling2d)?</p>