code: def forward(self, inputs, device):
      a, b = inputs
      y = functions.scatter_add(a, self.slices, b)
      return (y,)
  
file_path: chainer/tests/chainer_tests/functions_tests/array_tests/test_scatter_add.py
imports: import unittest
  import numpy
  import chainer
  from chainer import functions
  from chainer import testing
  from chainer.utils import type_check
label_desc: Use image node_id 3 for calling the TestScatterAdd obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: y