code: def trivial_cometric_matrix(base_point):
      """Compute a trivial cometric."""
      return gs.array(
          [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]]
      )
  
file_path: geomstats/tests/tests_geomstats/test_geometry/test_sub_riemannian_metric.py
imports: import geomstats.backend
  from geomstats.geometry.heisenberg import HeisenbergVectors
  from geomstats.geometry.sub_riemannian_metric import SubRiemannianMetric
  from geomstats.test.parametrizers import DataBasedParametrizer
  from geomstats.test_cases.geometry.sub_riemannian_metric import SubRiemannianMetricTestCase
  from .data.sub_riemannian_metric import SubRiemannianMetricCometricTestData, SubRiemannianMetricFrameTestData
label_desc: Use image node_id 2 for calling a global function with example usage: trivial_cometric_matrix(base_point) and returns: gs