code: def setUp(self):
      if self.activ == "relu":
          activ = relu
      elif self.activ == "add_one":
          activ = _add_one
      elif self.activ is None:
          activ = None
      self.x = np.random.uniform(
          -1, 1, (5, self.in_channels, 5, 5)
      ).astype(np.float32)
      self.gy = np.random.uniform(
          -1, 1, (5, self.out_channels, 5, 5)
      ).astype(np.float32)
  
      # Convolution is the identity function.
      initialW = np.array(
          [[0, 0, 0], [0, 1, 0], [0, 0, 0]], dtype=np.float32
      ).reshape((1, 1, 3, 3))
      bn_kwargs = {"decay": 0.8}
      initial_bias = 0
      if self.args_style == "explicit":
          self.l = Conv2DBNActiv(
              self.in_channels,
              self.out_channels,
              self.ksize,
              self.stride,
              self.pad,
              self.dilate,
              initialW=initialW,
              initial_bias=initial_bias,
              activ=activ,
              bn_kwargs=bn_kwargs,
          )
      elif self.args_style == "None":
          self.l = Conv2DBNActiv(
              None,
              self.out_channels,
              self.ksize,
              self.stride,
              self.pad,
              self.dilate,
              initialW=initialW,
              initial_bias=initial_bias,
              activ=activ,
              bn_kwargs=bn_kwargs,
          )
      elif self.args_style == "omit":
          self.l = Conv2DBNActiv(
              self.out_channels,
              self.ksize,
              stride=self.stride,
              pad=self.pad,
              dilate=self.dilate,
              initialW=initialW,
              initial_bias=initial_bias,
              activ=activ,
              bn_kwargs=bn_kwargs,
          )
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer.functions import relu
  from chainer import testing
  from chainermn import create_communicator
  from chainercv.links import Conv2DBNActiv
  from chainercv.utils.testing import attr
label_desc: Use image node_id 1 for calling the TestConv2DBNActiv obj's underlying member method code with example usage: obj.setUp() without return types