code: def _CheckRun(self, optimizer, loss, x0, num_steps, *args, **kwargs):
      init_fun, update_fun, get_params = optimizer(*args)
  
      opt_state = init_fun(x0)
      for i in range(num_steps):
          x = get_params(opt_state)
          g = grad(loss)(x)
          opt_state = update_fun(i, g, opt_state)
      xstar = get_params(opt_state)
      self.assertLess(loss(xstar), 1e-2)
  
      update_fun_jitted = jit(update_fun)
      opt_state = init_fun(x0)
      for i in range(num_steps):
          x = get_params(opt_state)
          g = grad(loss)(x)
          opt_state = update_fun_jitted(i, g, opt_state)
      xstar = get_params(opt_state)
      self.assertLess(loss(xstar), 1e-2)
  
imports: import functools
  from absl.testing import absltest
  import numpy
  import jax.numpy
  import jax._src.test_util
  from jax import jit, grad, jacfwd, jacrev
  from jax import tree_util
  from jax import lax
  from jax.example_libraries import optimizers
  from jax import config
label_desc: Use image node_id 3 for calling the OptimizerTests obj's underlying member method code with example usage: obj._CheckRun(optimizer, loss, x0, num_steps) without return types