code: def test_simple_cached_code(self):
      kernel = _core.create_reduction_func(
          "my_sum",
          ("q->q", "f->f"),
          ("in0", "a + b", "out0 = a", None),
          0,
      )
      assert len(kernel._cached_codes) == 0
      x = cupy.arange(10)
      kernel(x)
      assert len(kernel._cached_codes) == 1
      kernel(x)
      assert len(kernel._cached_codes) == 1
      kernel(x.astype(cupy.float32))
      assert len(kernel._cached_codes) == 2
  
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 3 for calling the TestReductionKernelCachedCode obj's underlying member method code with example usage: obj.test_simple_cached_code() without return types