code: def __call__(self, x):
      h = chainer.functions.relu(self.bn1(self.l1(x)))
      h = chainer.functions.relu(self.bn2(self.l2(h)))
      return self.l3(h)
  
imports: import chainer
  from chainer.backends.cuda import cupy
  import chainer.testing
  import chainer.utils
  import mpi4py.MPI
  import numpy
  import pytest
  from chainermn.communicators.naive_communicator import NaiveCommunicator
  from chainermn.communicators.pure_nccl_communicator import PureNcclCommunicator
  from chainermn.links import MultiNodeBatchNormalization
  from chainermn import nccl
label_desc: Use image node_id 2 for calling the ModelNormalBN obj's underlying member method code with example usage: obj.__call__(x) and returns: self