code: def test_NoRepeats(self) -> None:
      obsd = ObservationData(
          metric_names=["m1", "m2"],
          means=np.array([1.0, 2.0]),
          covariance=np.array([[1.0, 0.2], [0.2, 2.0]]),
      )
      obsd2 = ivw_metric_merge(obsd)
      self.assertEqual(obsd2, obsd)
  
file_path: Ax/ax/modelbridge/transforms/tests/test_ivw_transform.py
imports: import numpy
  from ax.core.observation import ObservationData
  from ax.modelbridge.transforms.ivw import IVW, ivw_metric_merge
  from ax.utils.common.testutils import TestCase
label_desc: Use image node_id 1 for calling the IVWTransformTest obj's underlying member method code with example usage: obj.test_NoRepeats() without return types