Hi there,

  1. For computer vision, people mostly use Yolo-V8 these days, so I have exported the annotations in LabelBox, and I wanna figure out how to convert it to Yolo, because My goal is to train my own model using YoloV8 in KerasCV library.

So I was looking at your post; Accelerate your computer vision journey with YOLOv5 and Labelbox

But the code provided there does not work;
Specifically, Google Colab has an issue with the utils library(I did !pip install utils but did not help) ;
this line of the mentioned code has an issue: save_dir = make_dirs(file.stem)
the utils library, NameError: name ‘make_dirs’ is not defined.

  1. Do you guys plan to convert Labelbox JSON to different model formats? (something like Roboflow Labelbox conversions).


For my exported Ndjson, I was able to modify the ultralytics conversion code as follows, and it is converting to Yolo format one by one in COlab now! I hope it works when I train it with KerasCV! ;

import json
import os
from pathlib import Path
import requests
import yaml
from PIL import Image
from tqdm import tqdm

def make_dirs(path):
path = Path(path)
if not path.exists():
return path

def convert(file, zip=True):
names =
file = Path(file)
save_dir = make_dirs(file.stem)
data =
with open(file, ‘r’) as f:
for line in f:

for img in tqdm(data, desc=f'Converting {file}'):
    im_path = img['data_row']['row_data']
    external_id = img['data_row']['external_id']
    im =, stream=True).raw if im_path.startswith('http') else im_path)
    width, height = im.size

    labels_dir = save_dir / 'labels'
    os.makedirs(labels_dir, exist_ok=True)
    label_path = labels_dir / Path(external_id).with_suffix('.txt').name

    images_dir = save_dir / 'images'
    os.makedirs(images_dir, exist_ok=True)
    image_path = images_dir / external_id, quality=95, subsampling=0)

    for project in img['projects'].values():
        for label in project['labels']:
            for obj in label['annotations']['objects']:
                top, left, h, w = obj['bounding_box'].values()
                xywh = [(left + w / 2) / width, (top + h / 2) / height, w / width, h / height]
                cls = obj['name']
                if cls not in names:
                line = names.index(cls), *xywh
                with open(label_path, 'a') as f:
                    f.write(('%g ' * len(line)).rstrip() % line + '\n')

d = {'path': f"../datasets/{file.stem}", 'train': "images/train", 'val': "images/val", 'test': "", 'nc': len(names), 'names': names}
with open(save_dir / file.with_suffix('.yaml').name, 'w') as f:
    yaml.dump(d, f, sort_keys=False)

if zip:
    print(f'Zipping as {save_dir}.zip...')
    os.system(f'zip -qr {save_dir}.zip {save_dir}')
print('Conversion completed successfully!')

if name == ‘main’: