def __init__(self, root: expression.Expression):
    'Constructor for proto index expression.\n\n    Args:\n      root: an expression that must return a RootNodeTensor.\n    '
    super().__init__(is_repeated=False, my_type=tf.int64)
    self._root = root
Constructor for proto index expression.

Args:
  root: an expression that must return a RootNodeTensor.
def __init__(self, root: expression.Expression):
    'Constructor for proto index expression.\n\n    Args:\n      root: an expression that must return a RootNodeTensor.\n    '
    super().__init__(is_repeated=False, my_type=tf.int64)
    self._root = root