message: Added code examples tf.keras.backend.gather
diff: @@ -1912,6 +1912,24 @@ def gather(reference, indices):
  Returns:
  A tensor of same type as `reference`.
  +
  + Examples:
  +
  + >>> var = tf.keras.backend.variable([[1, 2, 3], [4, 5, 6]])
  + >>> tf.keras.backend.eval(var)
  + array([[1., 2., 3.],
  + [4., 5., 6.]], dtype=float32)
  + >>> var_gathered = tf.keras.backend.gather(var, [0])
  + >>> tf.keras.backend.eval(var_gathered)
  + array([[1., 2., 3.]], dtype=float32)
  + >>> var_gathered = tf.keras.backend.gather(var, [1])
  + >>> tf.keras.backend.eval(var_gathered)
  + array([[4., 5., 6.]], dtype=float32)
  + >>> var_gathered = tf.keras.backend.gather(var, [0,1,0])
  + >>> tf.keras.backend.eval(var_gathered)
  + array([[1., 2., 3.],
  + [4., 5., 6.],
  + [1., 2., 3.]], dtype=float32)
  """
  return array_ops.gather(reference, indices)
  