message: Convert input to tensor in tf.math.angle
  This is a fix following
  See also and
diff: @@ -594,6 +594,7 @@ def angle(input, name=None):
  A `Tensor` of type `float32` or `float64`.
  """
  with ops.name_scope(name, "Angle", [input]) as name:
  + input = ops.convert_to_tensor(input, name="input")
  if input.dtype.is_complex:
  return gen_math_ops.angle(input, Tout=input.dtype.real_dtype, name=name)
  else:
  