code: def test_multistage_reductions(self, xp):
      return lambda x: x.prod(axis=1).sum(axis=1)
  
imports: import unittest
  import numpy
  import cupy
  from cupy import testing
  from cupy_tests.core_tests.fusion_tests import fusion_utils
label_desc: Use image node_id 2 for calling the TestFusionMultistageReductions obj's underlying member method code with example usage: obj.test_multistage_reductions(xp) and returns: function