code: def get_os():
      if psutil.MACOS:
          return "macos"
      elif psutil.LINUX:
          return "linux"
      elif psutil.WINDOWS:
          return "windows"
      else:
          return "unknown"
  
file_path: labml/client/test/hardware_track.py
imports: import time
  import psutil
  from labml import lab, experiment, tracker
  from labml.logger import inspect
label_desc: Use image node_id 6 for calling a global function with example usage: get_os() and returns: str, str, str, str