code: def _get_callback(func_name):
      for callback in callback_list:
          if func_name in dir(callback):
              return callback
      return None
  
file_path: nnabla/python/src/nnabla/utils/callback.py
imports: from nnabla.config import nnabla_config
  import importlib
label_desc: Use image node_id 1 for calling a global function with example usage: _get_callback(func_name) and returns: None, callback