message: Mark tf.keras.utils.multi_gpu_model as deprecated.
diff: @@ -21,6 +21,7 @@ from tensorflow.python.framework import ops
  from tensorflow.python.keras import backend as K
  from tensorflow.python.keras.engine.training import Model
  from tensorflow.python.ops import array_ops
  +from tensorflow.python.util import deprecation
  from tensorflow.python.util.tf_export import keras_export
  @@ -34,6 +35,8 @@ def _normalize_device_name(name):
  @keras_export('keras.utils.multi_gpu_model')
  +@deprecation.deprecated(
  + '2020-04-01', 'Use `tf.distribute.MirroredStrategy` instead.')
  def multi_gpu_model(model, gpus, cpu_merge=True, cpu_relocation=False):
  """Replicates a model on different GPUs.
  