code: def metric_matrix_test_data(self):
      smoke_data = [
          dict(
              base_point=gs.array([1.0]),
          ),
          dict(
              base_point=gs.array([[1.0], [0.5]]),
          ),
      ]
  
      return self.generate_tests(smoke_data)
  
file_path: geomstats/tests/tests_geomstats/test_information_geometry/data/fisher_rao_metric.py
imports: import geomstats.backend
  from geomstats.test.data import TestData
label_desc: Use image node_id 1 for calling the FisherRaoMetricCmpExponentialTestData obj's underlying member method code with example usage: obj.metric_matrix_test_data() and returns: self