code: def output_suggestions():
      global warning_messages
      if len(warning_messages) > 0:
          logger.warning(
              f"\n*****************Nano performance Suggestions*****************"
          )
          for message in warning_messages:
              logger.warning(message)
          logger.warning(
              f"\n*****************Nano performance Suggestions*****************"
          )
  
imports: import logging
  from typing import List
label_desc: Use image node_id 1 for calling a global function with example usage: output_suggestions() without return types