code: def _extract_return_annotation(sigstr, has_return_anno):
      if not has_return_anno:
          return ""
      return sigstr.split(")")[1]
  
file_path: nnabla/python/src/nnabla/utils/signature_utils.py
imports: import inspect
label_desc: Use image node_id 2 for calling a global function with example usage: _extract_return_annotation(sigstr, has_return_anno) and returns: sigstr, str