code: def testTracedStepSize(self):
      def loss(x):
          return jnp.dot(x, x)
  
      x0 = jnp.ones(2)
      step_size = 0.1
  
      init_fun, _, _ = optimizers.sgd(step_size)
      opt_state = init_fun(x0)
  
      @jit
      def update(opt_state, step_size):
          _, update_fun, get_params = optimizers.sgd(step_size)
          x = get_params(opt_state)
          g = grad(loss)(x)
          return update_fun(0, g, opt_state)
  
      update(opt_state, 0.9)
  
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 22 for calling the OptimizerTests obj's underlying member method code with example usage: obj.testTracedStepSize() and returns: jnp, update_fun