class_docstr: Reads and distributes a sub-batch on a host.
class_docstr_tok: ["Reads","and","distributes","a","sub-batch","on","a","host","."]
code: def _init_slice_cache(self):
      # Cache for tensor slices
      self._slice_dict = collections.defaultdict(list)
  
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 5 for calling the SubBatchSlicer obj's underlying member method code with example usage: obj._init_slice_cache() without return types