code: def setup(self):
      _, comm_id = self.pipe.recv()
      self.comm = nccl.NcclCommunicator(
          self.n_devices, comm_id, self.proc_id
      )
  
      self.model.to_device(self.device)
      self.reporter = reporter.Reporter()
      self.reporter.add_observer("main", self.model)
      self.reporter.add_observers(
          "main", self.model.namedlinks(skipself=True)
      )
  
imports: import multiprocessing
  import warnings
  import numpy
  import six
  import chainer
  from chainer.backends import cuda
  from chainer.dataset import convert
  from chainer import reporter
  from chainer.training.updaters import standard_updater
label_desc: Use image node_id 2 for calling the _Worker obj's underlying member method code with example usage: obj.setup() without return types