code: def load_cache():
      
      if not os.path.exists(settings.DUP_FILTER_FILE):
          return set()
  
      with open(settings.DUP_FILTER_FILE) as f:
          return set(
              json.loads(f.read())
          )
docs: Load cache from the disk.
  
      Return:
          set: Deserialized data from disk.