code: def testSubKeySetUp(self):
      with self.assertRaises(
          NotImplementedError,
          msg=(
              "A non-existent SubKey should be represented as None, not as ",
              "SubKey(None, None, None).",
          ),
      ):
          str(metric_types.SubKey())
      with self.assertRaises(
          ValueError,
          msg=("k and top_k cannot both be set at the same time",),
      ):
          str(metric_types.SubKey(k=2, top_k=2))
      with self.assertRaises(
          ValueError,
          msg=("k and class_id cannot both be set at the same time",),
      ):
          str(metric_types.SubKey(k=2, class_id=2))
  
file_path: model-analysis/tensorflow_model_analysis/metrics/metric_types_test.py
imports: import tensorflow
  from tensorflow_model_analysis.metrics import metric_types
label_desc: Use image node_id 6 for calling the MetricTypesTest obj's underlying member method code with example usage: obj.testSubKeySetUp() without return types