code: def test_slogdet_4(self, xp, dtype):
      a = testing.shaped_arange((2, 2, 2, 2), xp, dtype) + 1
      sign, logdet = xp.linalg.slogdet(a)
      return sign, logdet
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
  import cupyx
label_desc: Use image node_id 3 for calling the TestSlogdet obj's underlying member method code with example usage: obj.test_slogdet_4(xp, dtype) and returns: sign,  logdet