code: def service_singleton() -> Service:
      global _internal
      if _internal is None:
          _internal = Service()
  
      return _internal
  
file_path: labml/client/labml/internal/computer/service.py
imports: import os
  import sys
  from typing import Optional
  from labml import logger, monit
  from labml.logger import Text
label_desc: Use image node_id 1 for calling a global function with example usage: service_singleton() and returns: _internal