code: def check_backward(self, delegate_data, x_data, y_grad):
      gradient_check.check_backward(
          chainermn.functions.pseudo_connect,
          (delegate_data,) + x_data,
          y_grad,
          dtype=numpy.float64,
      )
  
file_path: chainer/tests/chainermn_tests/functions_tests/test_pseudo_connect.py
imports: import unittest
  import numpy
  import chainer
  from chainer import cuda
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
  import chainermn.functions
label_desc: Use image node_id 5 for calling the TestPseudoConnect obj's underlying member method code with example usage: obj.check_backward(delegate_data, x_data, y_grad) without return types