code: def _check_pillow_availability():
      if not available:
          raise ImportError(
              "PIL cannot be loaded. Install Pillow!\n"
              "The actual import error is as follows:\n"
              + str(_import_error)
          )
  
imports: import bisect
  import io
  import os
  import threading
  import zipfile
  import numpy
  import six
  import chainer
  from chainer.dataset import dataset_mixin
label_desc: Use image node_id 3 for calling a global function with example usage: _check_pillow_availability() without return types