code: def _contains_signed_and_unsigned(kw):
      def isdtype(v):
          if isinstance(v, numpy.dtype):
              return True
          elif isinstance(v, str):  # expecting dtype character codes
              return True
          elif isinstance(v, type) and issubclass(v, numpy.number):
              return True
          else:
              return False
  
      vs = set(v for v in kw.values() if isdtype(v))
      return any(d in vs for d in _unsigned_dtypes) and any(
          d in vs for d in _float_dtypes + _signed_dtypes
      )
  
imports: import functools
  import inspect
  import os
  import random
  from typing import Tuple, Type
  import traceback
  import unittest
  import warnings
  import numpy
  import cupy
  from cupy.testing import _array
  from cupy.testing import _parameterized
  import cupyx
  import cupyx.scipy.sparse
  from cupy.testing._pytest_impl import is_available
label_desc: Use image node_id 11 for calling a global function with example usage: _contains_signed_and_unsigned(kw) and returns: unknown, True, True, True, False