  If Tkinter is installed, then this will be used to manage the preview image, otherwise we
  fallback to opencv's imshow
  """
  import logging
  import sys
  
  from threading import Event, Lock
  from time import sleep
  
  from typing import Dict, Generator, List, Optional, Tuple, TYPE_CHECKING
 
</s> remove from typing import Dict, Generator, List, Optional, Tuple, TYPE_CHECKING

 </s> add  </s> remove import sys
 </s> add import typing as T </s> remove from typing import cast, Callable, Dict, List, Optional, TYPE_CHECKING
 </s> add 
import typing as T
  If Tkinter is installed, then this will be used to manage the preview image, otherwise we
  fallback to opencv's imshow
  """
  import logging
import typing as T
  
  from threading import Event, Lock
  from time import sleep
  
  from typing import Dict, Generator, List, Optional, Tuple, TYPE_CHECKING
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 
lib/training/preview_cv.py