          self._plugin = plugin
          self._is_predict = is_predict
          self._model_dir = model_dir
          self._save_optimizer = save_optimizer
          self._history: T.List[T.List[float]] = [[], []]  # Loss histories per save iteration
          self._backup = Backup(self._model_dir, self._plugin.name)
  
      @property
      def _filename(self) -> str:
          """str: The filename for this model."""
 
</s> remove                  save_optimizer: Literal["never", "always", "exit"]) -> None:
 </s> add                  save_optimizer: T.Literal["never", "always", "exit"]) -> None: </s> remove     def _should_backup(self, save_averages: T.List[float]) -> bool:
 </s> add     def _should_backup(self, save_averages: list[float]) -> bool: </s> remove         model: "ModelBase" = PluginLoader.get_model(self._args.trainer)(
 </s> add         model: ModelBase = PluginLoader.get_model(self._args.trainer)( </s> remove         self._frame_metadata: Optional["PNGHeaderSourceDict"] = None
        self._sub_folders: List[Optional[str]] = []
 </s> add         self._frame_metadata: PNGHeaderSourceDict | None = None
        self._sub_folders: list[str | None] = [] </s> remove         self._writer: Optional[imageio.plugins.pillowmulti.GIFFormat.Writer] = None
        self._gif_file: Optional[str] = None  # Set filename based on first file seen
 </s> add         self._writer: imageio.plugins.pillowmulti.GIFFormat.Writer | None = None
        self._gif_file: str | None = None  # Set filename based on first file seen
        self._history: list[list[float]] = [[], []]  # Loss histories per save iteration
          self._plugin = plugin
          self._is_predict = is_predict
          self._model_dir = model_dir
          self._save_optimizer = save_optimizer
        self._history: list[list[float]] = [[], []]  # Loss histories per save iteration
          self._backup = Backup(self._model_dir, self._plugin.name)
  
      @property
      def _filename(self) -> str:
          """str: The filename for this model."""
keep keep keep keep replace keep keep keep keep keep
 Rebase code (#1326)

* Remove tensorflow_probability requirement

* setup.py - fix progress bars

* requirements.txt: Remove pre python 3.9 packages

* update apple requirements.txt

* update INSTALL.md

* Remove python<3.9 code

* setup.py - fix Windows Installer

* typing: python3.9 compliant

* Update pytest and readthedocs python versions

* typing fixes

* Python Version updates
  - Reduce max version to 3.10
  - Default to 3.10 in installers
  - Remove incompatible 3.11 tests

* Update dependencies

* Downgrade imageio dep for Windows

* typing: merge optional unions and fixes

* Updates
  - min python version 3.10
  - typing to python 3.10 spec
  - remove pre-tf2.10 code
  - Add conda tests

* train: re-enable optimizer saving

* Update dockerfiles

* Update setup.py
  - Apple Conda deps to setup.py
  - Better Cuda + dependency handling

* bugfix: Patch logging to prevent Autograph errors

* Update dockerfiles

* Setup.py - Setup.py - stdout to utf-8

* Add more OSes to github Actions

* suppress mac-os end to end test 
plugins/train/model/_base/io.py