code: def test_slogdet_singular(self, xp, dtype):
      a = xp.zeros((3, 3), dtype)
      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 4 for calling the TestSlogdet obj's underlying member method code with example usage: obj.test_slogdet_singular(xp, dtype) and returns: sign,  logdet