code: def test_multiple_instances(self, xp, dtype):
      a = xp.array([2, 4, 5, 2, 1, 5], dtype=dtype)
      b = xp.array([4, 6, 2, 5, 7, 6], dtype=dtype)
      return xp.intersect1d(a, b, return_indices=True)
  
imports: import warnings
  import numpy
  from cupy import testing
label_desc: Use image node_id 5 for calling the TestIntersect1d obj's underlying member method code with example usage: obj.test_multiple_instances(xp, dtype) and returns: xp