code: def test_linear_ode_jacobian_fn_unspecified(
      self, solver, solution_times_fn
  ):
      jacobian_diag_part = np.float64([-0.5, -1.0])
      ode_fn = lambda time, state: jacobian_diag_part * state
      initial_time = 0.0
      initial_state = np.float64([1.0, 2.0])
      solver_instance = solver(rtol=_RTOL, atol=_ATOL)
      results = solver_instance.solve(
          ode_fn,
          initial_time,
          initial_state,
          solution_times=solution_times_fn(1.0),
      )
      times, states = self.evaluate([results.times, results.states])
      states_exact = (
          np.exp(
              jacobian_diag_part[np.newaxis, :] * times[:, np.newaxis]
          )
          * initial_state
      )
      self.assertAllClose(states, states_exact)
  
imports: from absl.testing import parameterized
  import numpy
  import tensorflow.compat.v1
  import tensorflow.compat.v2
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.math import gradient
  from tensorflow_probability.python.math.ode import base
  from tensorflow_probability.python.math.ode import bdf
  from tensorflow_probability.python.math.ode import dormand_prince
label_desc: Use image node_id 5 for calling the NonStiffTest obj's underlying member method code with example usage: obj.test_linear_ode_jacobian_fn_unspecified(solver, solution_times_fn) without return types