gfjiangly

which version do you install? Please uninstall and try to install using this command: `pip install cvtoolss==0.0.6a1`

```python import cvtools img_prefix = '/your_data/images' # images folder ann_file = '/your_data/dataset.json' # your coco data format json coco_analysis = cvtools.COCOAnalysis(img_prefix, ann_file) coco_analysis.stats_size_per_cat('/out/analysis/size_per_cat_data.json') ``` Use this [html page](https://github.com/gfjiangly/cvtools/blob/master/cvtools/label_analysis/g2/size_per_cat.html) to visually...