code: def test_cupy_matmul(self, xp):
      x1, x2 = self.make_x1_x2(
          xp, self.shape_pair, (self.dtype, self.dtype)
      )
      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 TestMatmulFp16ComputeTypes obj's underlying member method code with example usage: obj.test_cupy_matmul(xp) and returns: xp