  
      def group_face(self, img_list):
          print("Grouping by face similarity...")
  
          # Groups are of the form: group_num -> reference face
          reference_groups = dict()
 
</s>
        """ Group into bins by face similarity """
  
      def group_face(self, img_list):
        """ Group into bins by face similarity """
          print("Grouping by face similarity...")
  
          # Groups are of the form: group_num -> reference face
          reference_groups = dict()
keep add keep keep keep keep
 Sort tool bugfixes and linting
tools/sort.py