code: def initialize(sess=None):
      """
      Initialize all the uninitialized variables in the global scope.
  
      :param sess: (TensorFlow Session)
      """
      if sess is None:
          sess = tf.get_default_session()
      new_variables = set(tf.global_variables()) - ALREADY_INITIALIZED
      sess.run(tf.variables_initializer(new_variables))
      ALREADY_INITIALIZED.update(new_variables)
  
imports: import os
  import collections
  import functools
  import multiprocessing
  from typing import Set
  import numpy
  import tensorflow
label_desc: Use image node_id 15 for calling a global function with example usage: initialize(sess) without return types