message: Remove __slots__ that break API golden tests
diff: @@ -54,8 +54,6 @@ class InputSpec(object):
  a specific dimension value.
  """
  - __slots__ = ['dtype', 'shape', 'ndim', 'max_ndim', 'min_ndim', 'axes']
  -
  def __init__(self,
  dtype=None,
  shape=None,
  