Please cite：
@article{zhang2023csal,
title={CSAL: Cost sensitive active learning for multi-source drifting stream},
author={Zhang, Hang and Liu, Weike and Yang, Hao and Zhou, Yun and Zhu, Cheng and Zhang, Weiming},
journal={Knowledge-Based Systems},
volume={277},
pages={110771},
year={2023},
publisher={Elsevier}
}