text: import os
  from .generic import ImageListLabels
  
  DB_ROOT = os.environ['DB_ROOT']
  
  class Landmarks_clean(ImageListLabels):
      def __init__(self):
          ImageListLabels.__init__(self, os.path.join(DB_ROOT, 'landmarks/annotations/annotation_clean_train.txt'),
                                   os.path.join(DB_ROOT, 'landmarks/'))
  
  class Landmarks_clean_val(ImageListLabels):
      def __init__(self):
          ImageListLabels.__init__(self, os.path.join(DB_ROOT, 'landmarks/annotations/annotation_clean_val.txt'),
                                   os.path.join(DB_ROOT, 'landmarks/'))
  
  class Landmarks_lite(ImageListLabels):
      def __init__(self):
          ImageListLabels.__init__(self, os.path.join(DB_ROOT, 'landmarks/annotations/extra_landmark_images.txt'),
                                   os.path.join(DB_ROOT, 'landmarks/'))
  