          return os.path.exists(self.file)
  
      # << INIT FUNCTIONS >> #
  
      def get_serializer(self, filename, serializer):
          """ Set the serializer to be used for loading and
              saving alignments
  
              If a filename with a valid extension is passed in
              this will be used as the serializer, otherwise the
 
</s> remove         return os.path.exists(self.file)
 </s> add         retval = os.path.exists(self.file)
        logger.trace(retval)
        return retval </s> remove                 print("Warning: no reference video was supplied, even though "
                      "one may be used with the chosen action. If this is "
                      "intentional then ignore this warning.", file=sys.stderr)
 </s> add                 logger.warning("Warning: no reference video was supplied, even though "
                               "one may be used with the chosen action. If this is "
                               "intentional then ignore this warning.")
    @staticmethod
    def get_serializer(filename, serializer):
          return os.path.exists(self.file)
  
      # << INIT FUNCTIONS >> #
  
    @staticmethod
    def get_serializer(filename, serializer):
          """ Set the serializer to be used for loading and
              saving alignments
  
              If a filename with a valid extension is passed in
              this will be used as the serializer, otherwise the
keep keep keep keep replace keep keep keep keep keep
 Logging (#541)

* Convert prints to logger. Further logging improvements. Tidy  up

* Fix system verbosity. Allow SystemExit

* Fix reload extract bug

* Child Traceback handling

* Safer shutdown procedure

* Add shutdown event to queue manager

* landmarks_as_xy > property. GUI notes + linting. Aligner bugfix

* fix FaceFilter. Enable nFilter when no Filter is supplied

* Fix blurry face filter

* Continue on IO error. Better error handling

* Explicitly print stack trace tocrash log

* Windows Multiprocessing bugfix

* Add git info and conda version to crash log

* Windows/Anaconda mp bugfix

* Logging fixes for training 
lib/alignments.py