class_docstr: An utility class that maps between pnum to devices.
class_docstr_tok: ["An","utility","class","that","maps","between","pnum","to","devices","."]
code: def host_id_to_its_pnums(self):
      return self._host_id_to_its_pnums
  
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 6 for calling the ProcessDevices obj's underlying member method code with example usage: obj.host_id_to_its_pnums() and returns: self