text: import json
  from collections import defaultdict
  
  name_box_id = defaultdict(list)
  id_name = dict()
  f = open(
      "/data/datasets/coco/annotations/instances_train2017.json",
      encoding='utf-8')
  data = json.load(f)
  
  annotations = data['annotations']
  for ant in annotations:
      id = ant['image_id']
      name = '/data/datasets/coco/train2017/%012d.jpg' % id
      cat = ant['category_id']
  
      if cat >= 1 and cat <= 11:
          cat = cat - 1
      elif cat >= 13 and cat <= 25:
          cat = cat - 2
      elif cat >= 27 and cat <= 28:
          cat = cat - 3
      elif cat >= 31 and cat <= 44:
          cat = cat - 5
      elif cat >= 46 and cat <= 65:
          cat = cat - 6
      elif cat == 67:
          cat = cat - 7
      elif cat == 70:
          cat = cat - 9
      elif cat >= 72 and cat <= 82:
          cat = cat - 10
      elif cat >= 84 and cat <= 90:
          cat = cat - 11
  
      name_box_id[name].append([ant['bbox'], cat])
  
  f = open('coco/train.txt', 'w')
  for key in name_box_id.keys():
      f.write(key)
      box_infos = name_box_id[key]
      for info in box_infos:
          x_min = int(info[0][0])
          y_min = int(info[0][1])
          x_max = x_min + int(info[0][2])
          y_max = y_min + int(info[0][3])
  
          box_info = " %d,%d,%d,%d,%d" % (
              x_min, y_min, x_max, y_max, int(info[1]))
          f.write(box_info)
      f.write('\n')
  f.close()
  