code: def call(self, input_, state):
      s = input_ + state
      return s, s
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import numpy
  import tensorflow
  from tf_agents.keras_layers import dynamic_unroll_layer
label_desc: Use image node_id 2 for calling the AddInputAndStateKerasRNNCell obj's underlying member method code with example usage: obj.call(input_, state) and returns: s,  s