code: def fix_jit_callable_signature(
      app, what, name, obj, options, signature, return_annotation
  ):
      if "cupyx.jit" in name and callable(obj) and signature is None:
          return (f"{inspect.signature(obj)}", None)
  
file_path: cupy/docs/source/conf.py
imports: import importlib
  import inspect
  import os
  import sys
  import sphinx
  import cupy
  import _comparison_generator
label_desc: Use image node_id 7 for calling a global function with example usage: fix_jit_callable_signature(app, what, name, obj, options, signature, return_annotation) and returns: inspect,  None