message: Fixing bug that was trying to call append on a tuple. Fixed by converting to a list.
diff: @@ -514,7 +514,7 @@ class LayerCallCollection(object):
  # Add training arg to wrapper function.
  arg_spec = tf_inspect.getfullargspec(call_fn)
  args = arg_spec.args + ['training']
  - defaults = arg_spec.defaults or []
  + defaults = list(arg_spec.defaults or [])
  defaults.append(False)
  new_arg_spec = tf_inspect.FullArgSpec(
  args=args,
  