code: def func(self, xp, a):
      if xp is numpy:
          expected_former = numpy.maximum(a, 0)
          expected_latter = numpy.maximum(-a, 0)
          expected = numpy.concatenate(
              (expected_former, expected_latter), axis=self.axis
          )
          return expected
      return xp.crelu(a, self.axis)
  
imports: import random
  import chainer
  import numpy
  import chainerx
  from chainer import utils
  from chainerx_tests import array_utils
  from chainerx_tests import dtype_utils
  from chainerx_tests import op_utils
label_desc: Use image node_id 2 for calling the TestCRelu obj's underlying member method code with example usage: obj.func(xp, a) and returns: xp, expected