code: def forward(self, x):
      return chainer.functions.relu(self.bn(self.conv(x)))
  
imports: import unittest
  import chainer
  import chainer.testing
  import chainer.testing.attr
  import chainermn
  from chainermn.testing.device import get_device
label_desc: Use image node_id 2 for calling the BnChain obj's underlying member method code with example usage: obj.forward(x) and returns: chainer