code: def test_matrix_power_3(self, xp, dtype):
      a = testing.shaped_arange((3, 3), xp, dtype)
      return xp.linalg.matrix_power(a, 3)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 4 for calling the TestMatrixPower obj's underlying member method code with example usage: obj.test_matrix_power_3(xp, dtype) and returns: xp