code: def test_mat_exp_orb_params():
      from deepchem.models.dft.hamilton.orbparams import MatExpOrbParams
  
      params = torch.randn(3, 3)
      coeffs = torch.randn(4, 3)
      orb = MatExpOrbParams.params2orb(params, coeffs)[0]
      params2, coeffs2 = MatExpOrbParams.orb2params(orb)
      assert coeffs2.shape == orb.shape
  
label_desc: Use image node_id 3 for calling a global function with example usage: test_mat_exp_orb_params() without return types