code: def test_hamiltonian(self, cotangent_vec, base_point, expected):
      state = gs.array([base_point, cotangent_vec])
      result = self.space.metric.hamiltonian(state)
      self.assertAllClose(result, expected)
  
file_path: geomstats/geomstats/test_cases/geometry/sub_riemannian_metric.py
imports: import geomstats.backend
  from geomstats.test.test_case import TestCase
label_desc: Use image node_id 2 for calling the SubRiemannianMetricTestCase obj's underlying member method code with example usage: obj.test_hamiltonian(cotangent_vec, base_point, expected) without return types