def row_to_features(row):
     image_path = os.path.join(DATA_DIR, *row['image_file'].split('/'))
     # print(image_path)
     if not os.path.isfile(image_path):
         print(f"Image file '{image_path}' is missing!")
         return None
     return Follower.get_features(cv2.imread(image_path))