code: def testReluGrad(self):
      rtol = 1e-2 if jtu.test_device_matches(["tpu"]) else None
      check_grads(nn.relu, (1.0,), order=3, rtol=rtol)
      check_grads(nn.relu, (-1.0,), order=3, rtol=rtol)
      jaxpr = jax.make_jaxpr(jax.grad(nn.relu))(0.0)
      self.assertGreaterEqual(len(jaxpr.jaxpr.eqns), 2)
  
imports: import collections
  from functools import partial
  import itertools
  import unittest
  from absl.testing import absltest
  from absl.testing import parameterized
  import scipy.stats
  from jax._src import config
  from jax._src import core
  from jax._src import test_util
  from jax._src import ad_checkpoint
  from jax.test_util import check_grads
  from jax import nn
  from jax import random
  import jax
  import jax.numpy
label_desc: Use image node_id 12 for calling the NNFunctionsTest obj's underlying member method code with example usage: obj.testReluGrad() without return types