code: def default_dnn_base_path():
      # We want to default to the cuda root if cudnn is installed there
      root = config.cuda__root
      # The include doesn't change location between OS.
      if root and os.path.exists(
          os.path.join(root, "include", "cudnn.h")
      ):
          return root
      return ""
  
imports: import errno
  import logging
  import os
  import platform
  import re
  import socket
  import sys
  import textwrap
  import numpy
  from setuptools._distutils.spawn import find_executable
  import pytensor
  from pytensor.configparser import BoolParam, ConfigParam, DeviceParam, EnumStr, FloatParam, IntParam, StrParam, _create_default_config
  from pytensor.utils import LOCAL_BITWIDTH, PYTHON_INT_BITWIDTH, call_subprocess_Popen, maybe_add_to_os_environ_pathlist, output_subprocess_Popen
label_desc: Use image node_id 3 for calling a global function with example usage: default_dnn_base_path() and returns: str, root