class_docstr: Handles input pipeline for PlacementMeshImpl.
class_docstr_tok: ["Handles","input","pipeline","for","PlacementMeshImpl","."]
code: def initialize(self, sess):
      sess.run(self._input_initializers)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import threading
  import time
  import numpy
  from six.moves import range
  from six.moves import zip
  import tensorflow.compat.v1
  from tensorflow.python.framework import ops
  from tensorflow.python.tpu import tpu_feed
label_desc: Use image node_id 2 for calling the PlacementMeshImplInputReader obj's underlying member method code with example usage: obj.initialize(sess) without return types