code: def test_operator_matmul(self, xp, dtype, shape1, shape2):
      x1 = testing.shaped_random(shape1, xp, dtype)
      x2 = testing.shaped_random(shape2, xp, dtype)
      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 TestMatmulIntegralLargeBatch obj's underlying member method code with example usage: obj.test_operator_matmul(xp, dtype, shape1, shape2) and returns: operator