code: def test_operator_matmul(self, xp):
      x1, x2 = self.make_x1_x2(xp, self.shape_pair, self.dtype_pair)
      return operator.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 1 for calling the TestMatmulFp64ComputeTypes obj's underlying member method code with example usage: obj.test_operator_matmul(xp) and returns: operator