code: def testGelu(self, approximate):
      def gelu_reference(x):
          return x * scipy.stats.norm.cdf(x)
  
      rng = jtu.rand_default(self.rng())
      args_maker = lambda: [rng((4, 5, 6), jnp.float32)]
      self._CheckAgainstNumpy(
          gelu_reference,
          partial(nn.gelu, approximate=approximate),
          args_maker,
          check_dtypes=False,
          tol=1e-3 if approximate else None,
      )
  
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 20 for calling the NNFunctionsTest obj's underlying member method code with example usage: obj.testGelu(approximate) and returns: unknown