code: def symp_grad_test_data(self):
      smoke_data = [
          dict(
              test_state=gs.array([[1.0, 1.0, 1.0], [2.0, 3.0, 4.0]]),
              expected=gs.array([[2.0, 3.0, 4.0], [-0.0, -0.0, -0.0]]),
          )
      ]
      return self.generate_tests(smoke_data)
  
file_path: geomstats/tests/tests_geomstats/test_geometry/data/sub_riemannian_metric.py
imports: import geomstats.backend
  from geomstats.test.data import TestData
label_desc: Use image node_id 3 for calling the SubRiemannianMetricCometricTestData obj's underlying member method code with example usage: obj.symp_grad_test_data() and returns: self