In the tools/data/README.md, the link of annotations of Kinetics-400 is not working. For Kinetics400, since the skeleton annotations are large, we do not provide the direct download links on aliyun. Please use the following link to download the kpfiles and extract it under $PYSKL/data/k400 for Kinetics-400 training & testing: https://mycuhk-my.sharepoint.com/:u:/g/personal/1155136485_link_cuhk_edu_hk/EeyDCVskqLtClMVVwqD53acBF2FEwkctp3vtRbkLfnKSTw?e=B3SZlM