content: import os
  import os.path as osp
  
  annotation_root = '../../../data/gym/annotations'
  data_root = '../../../data/gym/subactions'
  frame_data_root = '../../../data/gym/subaction_frames'
  
  videos = os.listdir(data_root)
  videos = set(videos)
  
  train_file_org = osp.join(annotation_root, 'gym99_train_org.txt')
  val_file_org = osp.join(annotation_root, 'gym99_val_org.txt')
  train_file = osp.join(annotation_root, 'gym99_train.txt')
  val_file = osp.join(annotation_root, 'gym99_val.txt')
  train_frame_file = osp.join(annotation_root, 'gym99_train_frame.txt')
  val_frame_file = osp.join(annotation_root, 'gym99_val_frame.txt')
  
  train_org = open(train_file_org).readlines()
  train_org = [x.strip().split() for x in train_org]
  train = [x for x in train_org if x[0] + '.mp4' in videos]
  if osp.exists(frame_data_root):
      train_frames = []
      for line in train:
          length = len(os.listdir(osp.join(frame_data_root, line[0])))
          train_frames.append([line[0], str(length // 3), line[1]])
      train_frames = [' '.join(x) for x in train_frames]
      with open(train_frame_file, 'w') as fout:
          fout.write('\n'.join(train_frames))
  
  train = [x[0] + '.mp4 ' + x[1] for x in train]
  with open(train_file, 'w') as fout:
      fout.write('\n'.join(train))
  
  val_org = open(val_file_org).readlines()
  val_org = [x.strip().split() for x in val_org]
  val = [x for x in val_org if x[0] + '.mp4' in videos]
  if osp.exists(frame_data_root):
      val_frames = []
      for line in val:
          length = len(os.listdir(osp.join(frame_data_root, line[0])))
          val_frames.append([line[0], str(length // 3), line[1]])
      val_frames = [' '.join(x) for x in val_frames]
      with open(val_frame_file, 'w') as fout:
          fout.write('\n'.join(val_frames))
  
  val = [x[0] + '.mp4 ' + x[1] for x in val]
  with open(val_file, 'w') as fout:
      fout.write('\n'.join(val))
  