code: def value(self):
      return self._foo
  
file_path: sonnet/sonnet/src/distribute/distributed_batch_norm_test.py
imports: from absl import logging
  from absl.testing import parameterized
  from sonnet.src import test_utils
  from sonnet.src.distribute import distributed_batch_norm
  from sonnet.src.distribute import replicator
  import tensorflow
label_desc: Use image node_id 3 for calling the TestMetric obj's underlying member method code with example usage: obj.value() and returns: self