code: def print_network_traceback(funcs):
      logger.critical("Network traceback:")
      for i, func in enumerate(funcs):
          logger.critical(
              "{}{}".format(
                  "->" if i == len(funcs) - 1 else "  ", func.name
              )
          )
  
file_path: nnabla/python/test/core/legacy_network.py
imports: from nnabla.logger import logger
  import nnabla.function
label_desc: Use image node_id 1 for calling a global function with example usage: print_network_traceback(funcs) without return types