code: def test_kernel(self, kernel, distance, bandwidth, expected, atol):
      res = kernel(distance, bandwidth)
      self.assertAllClose(res, expected, atol=atol)
  
label_desc: Use image node_id 1 for calling the RadialKernelFunctionsTestCase obj's underlying member method code with example usage: obj.test_kernel(kernel, distance, bandwidth, expected, atol) without return types