def _maybe_validate_shape_override(self, override_shape, base_is_scalar,
                                     validate_args, name):
    """Helper to __init__ which ensures override batch/event_shape are valid."""
    if override_shape is None:
      override_shape = []

    override_shape = tf.convert_to_tensor(
        value=override_shape, dtype=tf.int32, name=name)

    if not dtype_util.is_integer(override_shape.dtype):
      raise TypeError("shape override must be an integer")

    override_is_scalar = _is_scalar_from_shape_tensor(override_shape)
    if tf.get_static_value(override_is_scalar):
      return self._empty

    dynamic_assertions = []

    if tensorshape_util.rank(override_shape.shape) is not None:
      if tensorshape_util.rank(override_shape.shape) != 1:
        raise ValueError("shape override must be a vector")
    elif validate_args:
      dynamic_assertions += [
          assert_util.assert_rank(
              override_shape, 1, message="shape override must be a vector")
      ]

    if tf.get_static_value(override_shape) is not None:
      if any(s < 0 for s in tf.get_static_value(override_shape)):
        raise ValueError("shape override must have non-negative elements")
    elif validate_args:
      dynamic_assertions += [
          assert_util.assert_non_negative(
              override_shape,
              message="shape override must have non-negative elements")
      ]

    is_both_nonscalar = prefer_static.logical_and(
        prefer_static.logical_not(base_is_scalar),
        prefer_static.logical_not(override_is_scalar))
    if tf.get_static_value(is_both_nonscalar) is not None:
      if tf.get_static_value(is_both_nonscalar):
        raise ValueError("base distribution not scalar")
    elif validate_args:
      dynamic_assertions += [
          assert_util.assert_equal(
              is_both_nonscalar, False, message="base distribution not scalar")
      ]

    if not dynamic_assertions:
      return override_shape
    return distribution_util.with_dependencies(
        dynamic_assertions, override_shape)
Helper to __init__ which ensures override batch/event_shape are valid.