      logger.debug("Safely shutting down")
      from lib.queue_manager import queue_manager
      from lib.multithreading import terminate_processes
      queue_manager.terminate_queues()
      terminate_processes()
      logger.debug("Cleanup complete. Shutting down queue manager and exiting")
      queue_manager._log_queue.put(None)  # pylint:disable=protected-access
      while not queue_manager._log_queue.empty():  # pylint:disable=protected-access
          continue
      queue_manager.manager.shutdown()
 
</s> remove     from lib.multithreading import terminate_processes
 </s> add  </s> remove     queue_manager._log_queue.put(None)  # pylint:disable=protected-access
    while not queue_manager._log_queue.empty():  # pylint:disable=protected-access
        continue
    queue_manager.manager.shutdown()
 </s> add  </s> remove from lib.multithreading import SpawnProcess
from lib.queue_manager import queue_manager, QueueEmpty
 </s> add from lib.queue_manager import queue_manager </s> remove from lib.multithreading import SpawnProcess
from lib.queue_manager import queue_manager, QueueEmpty
from lib.utils import get_backend
from plugins.plugin_loader import PluginLoader
 </s> add from lib.queue_manager import queue_manager
from plugins.extract.pipeline import Extractor </s> remove from lib.faces_detect import DetectedFace
 </s> add 
      logger.debug("Safely shutting down")
      from lib.queue_manager import queue_manager
      from lib.multithreading import terminate_processes
      queue_manager.terminate_queues()

      logger.debug("Cleanup complete. Shutting down queue manager and exiting")
      queue_manager._log_queue.put(None)  # pylint:disable=protected-access
      while not queue_manager._log_queue.empty():  # pylint:disable=protected-access
          continue
      queue_manager.manager.shutdown()
keep keep keep keep replace keep keep keep keep keep
 De-Multiprocess Extract (#871)

* requirements.txt: - Pin opencv to 4.1.1 (fixes cv2-dnn error)

* lib.face_detect.DetectedFace: change LandmarksXY to landmarks_xy. Add left, right, top, bottom attributes

* lib.model.session: Session manager for loading models into different graphs (for Nvidia + CPU)

* plugins.extract._base: New parent class for all extract plugins

* plugins.extract.pipeline. Remove MultiProcessing. Dynamically limit batchsize for Nvidia cards. Remove loglevel input

* S3FD + FAN plugins. Standardise to Keras version for all backends

* Standardize all extract plugins to new threaded codebase

* Documentation. Start implementing Numpy style docstrings for Sphinx Documentation

* Remove s3fd_amd. Change convert OTF to expect DetectedFace object

* faces_detect - clean up and documentation

* Remove PoolProcess

* Migrate manual tool to new extract workflow

* Remove AMD specific extractor code from cli and plugins

* Sort tool to new extract workflow

* Remove multiprocessing from project

* Remove multiprocessing queues from QueueManager

* Remove multiprocessing support from logger

* Move face_filter to new extraction pipeline

* Alignments landmarksXY > landmarks_xy and legacy handling

* Intercept get_backend for sphinx doc build

# Add Sphinx documentation 
lib/utils.py