code: def _check_oss_variable():
      return (
          access_id is not None
          and access_key is not None
          and host is not None
          and bucket is not None
      )
  
imports: import os
  import unittest
  from tensorflow.python.framework import errors
  from tensorflow.python.lib.io import file_io
  from tensorflow.python.platform import test
  from tensorflow.python.platform import gfile
  import tensorflow
  import tensorflow_io
label_desc: Use image node_id 1 for calling a global function with example usage: _check_oss_variable() and returns: unknown