code: def get_sum_func(self):
      return _core.create_reduction_func(
          "my_sum", ("b->b",), ("in0", "a + b", "out0 = a", None), 0
      )
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  import cupy._core._accelerator
  from cupy import _core
  from cupy import testing
label_desc: Use image node_id 1 for calling the SimpleReductionFunctionTestBase obj's underlying member method code with example usage: obj.get_sum_func() and returns: _core