code: def __call__(self, theta):
      if self.sess is None:
          return tf.get_default_session().run(
              self.operation, feed_dict={self.theta: theta}
          )
      else:
          return self.sess.run(
              self.operation, feed_dict={self.theta: theta}
          )
  
imports: import os
  import collections
  import functools
  import multiprocessing
  from typing import Set
  import numpy
  import tensorflow
label_desc: Use image node_id 2 for calling the SetFromFlat obj's underlying member method code with example usage: obj.__call__(theta) and returns: tf, self