code: def forward(self, inputs, device):
      x1, x2 = inputs
      return (self.function(x1, x2),)
  
file_path: chainer/tests/chainer_tests/functions_tests/loss_tests/test_squared_error.py
imports: import numpy
  from chainer import functions
  from chainer import testing
label_desc: Use image node_id 3 for calling the TestSquaredError obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: self