  
  
  class PreviewBuffer():
      """ A thread safe class for holding preview images """
      def __init__(self):
          logger.debug("Initializing: %s", __class__.__name__)
          self._images: Dict[str, "np.ndarray"] = {}
          self._lock = Lock()
          self._updated = Event()
          logger.debug("Initialized: %s", __class__.__name__)
  
 
</s> remove         logger.debug("Initialized: %s", __class__.__name__)
 </s> add         logger.debug("Initialized: %s", self.__class__.__name__) </s> remove         seen: dict[str, list[int]] = {}
 </s> add         seen: Dict[str, List[int]] = {} </s> remove         self._changes = {}
 </s> add         self._changes: Dict[str, str] = {} </s> remove         frame = reader.get_next_data()[:, :, ::-1]
 </s> add         frame = reader.get_next_data()[:, :, ::-1]  # type:ignore[index] </s> remove     def __init__(self, arguments):
 </s> add     def __init__(self, arguments: Namespace) -> None:
    def __init__(self) -> None:
        logger.debug("Initializing: %s", self.__class__.__name__)
  
  
  class PreviewBuffer():
      """ A thread safe class for holding preview images """
    def __init__(self) -> None:
        logger.debug("Initializing: %s", self.__class__.__name__)
    def __init__(self) -> None:
        logger.debug("Initializing: %s", self.__class__.__name__)
          self._images: Dict[str, "np.ndarray"] = {}
          self._lock = Lock()
          self._updated = Event()
          logger.debug("Initialized: %s", __class__.__name__)
  
keep keep keep keep replace replace keep keep keep keep keep
 tests:
  - unit test: tools.alignments.media
  - Add mypy test
  - Typing fixes 
lib/training/preview_cv.py