code: def bar(self):
      pass
  
imports: import abc
  import unittest.mock
  from torch.distributed.elastic.metrics.api import MetricData, MetricHandler, MetricStream, _get_metric_name, prof
  from torch.testing._internal.common_utils import run_tests, TestCase
label_desc: Use image node_id 2 for calling the MetricsApiTest obj's underlying member method code with example usage: obj.bar() without return types