message: Enable autograph by default in tf.function.
diff: @@ -213,7 +213,7 @@ class PolymorphicFunction(object):
  python_function,
  name,
  input_signature=None,
  - autograph=False,
  + autograph=True,
  experimental_autograph_options=None):
  """Initializes a polymorphic function.
  @@ -495,7 +495,7 @@ class PolymorphicFunction(object):
  def function(func=None,
  input_signature=None,
  - autograph=False,
  + autograph=True,
  experimental_autograph_options=None):
  """Defines a function as per the "functions, not sessions" document."""
  if input_signature is not None:
  