code: def test_external_trace(self, xp, dtype):
      a = testing.shaped_arange((2, 3, 4, 5), xp, dtype)
      return xp.trace(a, 1, 3, 2)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
  import cupyx
label_desc: Use image node_id 2 for calling the TestTrace obj's underlying member method code with example usage: obj.test_external_trace(xp, dtype) and returns: xp