def _unify_call_signature(i, dist_fn):
  """Creates `dist_fn_wrapped` which calls `dist_fn` with all prev nodes.

  Args:
    i: Python `int` corresponding to position in topologically sorted DAG.
    dist_fn: Python `callable` which takes a subset of previously constructed
      distributions (in reverse order) and produces a new distribution instance.

  Returns:
    dist_fn_wrapped: Python `callable` which takes all previous distributions
      (in non reverse order) and produces a  new distribution instance.
    args: `tuple` of `str` representing the arg names of `dist_fn` (and in non
      wrapped, "natural" order). `None` is returned only if the input is not a
      `callable`.
  """
  if distribution_util.is_distribution_instance(dist_fn):
    return (lambda *_: dist_fn), None

  if not callable(dist_fn):
    raise TypeError('{} must be either `tfd.Distribution`-like or '
                    '`callable`.'.format(dist_fn))

  args = _get_required_args(dist_fn)
  if not args:
    return (lambda *_: dist_fn()), ()

  @functools.wraps(dist_fn)
  def dist_fn_wrapped(*xs):
    """Calls `dist_fn` with reversed and truncated args."""
    if i != len(xs):
      raise ValueError(
          'Internal Error: Unexpected number of inputs provided to {}-th '
          'distribution maker (dist_fn: {}, expected: {}, saw: {}).'.format(
              i, dist_fn, i, len(xs)))
    if len(xs) < len(args):
      raise ValueError(
          'Internal Error: Too few inputs provided to {}-th distribution maker '
          '(dist_fn: {}, expected: {}, saw: {}).'.format(
              i, dist_fn, len(args), len(xs)))
    return dist_fn(*reversed(xs[-len(args):]))
  return dist_fn_wrapped, args
Creates `dist_fn_wrapped` which calls `dist_fn` with all prev nodes.

  Args:
    i: Python `int` corresponding to position in topologically sorted DAG.
    dist_fn: Python `callable` which takes a subset of previously constructed
      distributions (in reverse order) and produces a new distribution instance.

  Returns:
    dist_fn_wrapped: Python `callable` which takes all previous distributions
      (in non reverse order) and produces a  new distribution instance.
    args: `tuple` of `str` representing the arg names of `dist_fn` (and in non
      wrapped, "natural" order). `None` is returned only if the input is not a
      `callable`.