code: def test_reads_from_cache(self):
      with ops.Graph().as_default():
          training_util.create_global_step()
          first = training_util._get_or_create_global_step_read()
          second = training_util._get_or_create_global_step_read()
          self.assertEqual(first, second)
  
file_path: tensorflow/tensorflow/python/training/training_util_test.py
imports: from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import variable_v1
  from tensorflow.python.platform import test
  from tensorflow.python.training import monitored_session
  from tensorflow.python.training import training_util
label_desc: Use image node_id 2 for calling the GlobalStepReadTest obj's underlying member method code with example usage: obj.test_reads_from_cache() without return types