code: def test_forward_multi_gpus(self):
      if not self.lazy_init:
          device_0 = BackendConfig(
              {"use_cuda": True, "cuda_device": 0}
          ).device
          device_1 = BackendConfig(
              {"use_cuda": True, "cuda_device": 1}
          ).device
          self.check_multi_devices_forward(device_0, device_1)
  
imports: import copy
  import os
  import unittest
  import numpy
  import pytest
  import chainer
  from chainer.backends import _cpu
  from chainer.link_hooks.spectral_normalization import SpectralNormalization
  import chainer.links
  from chainer import serializers
  from chainer import testing
  from chainer.testing import attr
  from chainer.testing.backend import BackendConfig
  from chainer import utils
label_desc: Use image node_id 15 for calling the BaseTest obj's underlying member method code with example usage: obj.test_forward_multi_gpus() without return types