code: def test_modified_euler_methods(self):
      (
          new_pos,
          new_momentum,
          new_grad,
      ) = self.test_with_grad_log.get_proposed_values()
      np.testing.assert_almost_equal(new_pos, np.array([-1.0, 0.5]))
      np.testing.assert_almost_equal(
          new_momentum, np.array([-2.0, 1.0])
      )
      np.testing.assert_almost_equal(
          new_grad, np.array([-0.93406593, 0.08241758])
      )
      (
          new_pos,
          new_momentum,
          new_grad,
      ) = self.test_without_grad_log.get_proposed_values()
      np.testing.assert_almost_equal(new_pos, np.array([-0.6, 0.3]))
      np.testing.assert_almost_equal(
          new_momentum, np.array([-2.0, 1.0])
      )
      np.testing.assert_almost_equal(
          new_grad, np.array([-0.56043956, 0.04945055])
      )
  
imports: import unittest
  import numpy
  from pgmpy.factors.distributions import GaussianDistribution
  from pgmpy.sampling import LeapFrog, ModifiedEuler, GradLogPDFGaussian
label_desc: Use image node_id 2 for calling the TestModifiedEuler obj's underlying member method code with example usage: obj.test_modified_euler_methods() without return types