code: def __call__(self, x):
      h1 = F.relu(self.l1(x))
      h2 = F.relu(self.l2(h1))
      return self.l3(h2)
  
imports: import os
  import tempfile
  import unittest
  import warnings
  import numpy
  import chainer
  from chainer.dataset import convert
  import chainer.functions
  import chainer.links
  import chainer.testing
  from chainer import training
  import chainermn
  from chainermn.extensions.checkpoint import _CheckpointStats
  from chainermn.extensions.checkpoint import create_multi_node_checkpointer
  from chainermn.testing.device import get_device
  import chainerx
label_desc: Use image node_id 2 for calling the MLP obj's underlying member method code with example usage: obj.__call__(x) and returns: self