class_docstr: Packed forward accumulator state. The return value of `pack_tangents`.
code: def __new__(cls, indices=None, tangents=None):
      if indices is None:
          indices = ()
      if tangents is None:
          tangents = []
      return super(TangentInfo, cls).__new__(cls, indices, tangents)
  
file_path: tensorflow-upstream/tensorflow/python/eager/forwardprop_util.py
imports: import collections
  import contextlib
  from tensorflow.python import pywrap_tfe
label_desc: Use image node_id 1 for calling the TangentInfo obj's underlying member method code with example usage: obj.__new__(cls, indices, tangents) and returns: super