code: def test_cupy_matmul(self, xp, dtype1, dtype2):
      x1 = testing.shaped_arange(self.shape_pair[0], xp, dtype1)
      x2 = testing.shaped_arange(self.shape_pair[1], xp, dtype2)
      return xp.matmul(x1, x2)
  
imports: import operator
  import unittest
  import numpy
  import pytest
  import cupy
  from cupy._core import _routines_linalg
  from cupy import testing
label_desc: Use image node_id 2 for calling the TestMatmul obj's underlying member method code with example usage: obj.test_cupy_matmul(xp, dtype1, dtype2) and returns: xp