code: def test_sign_zero(self, xp, scp, dtype):
      a = xp.array([1, 1]).astype(dtype)
      b = xp.array([1, -1]).astype(dtype)
      return scp.special.logsumexp(a, b=b, return_sign=True)
  
file_path: cupy/tests/cupyx_tests/scipy_tests/special_tests/test_logsumexp.py
imports: import pytest
  import numpy
  import cupy
  from cupy import testing
  import cupyx.scipy.special
label_desc: Use image node_id 7 for calling the TestLogsumexp obj's underlying member method code with example usage: obj.test_sign_zero(xp, scp, dtype) and returns: scp