1 School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an Shaanxi 710072, China. Electronic address: xiaolei.zhang@nwpu.edu.cn.
2 Audio, Speech and Language Processing Group (ASLP@NPU), School of Computer Science, Northwestern Polytechnical University, Xi'an Shaanxi 710072, China. Electronic address: lxie@nwpu.edu.cn.
3 Department of Computer Science and Engineering, The Ohio State University, Columbus, OH 43210, USA. Electronic address: fosler-lussier.1@osu.edu.
4 Université de Lorraine, CNRS, Inria, LORIA, F-54000, Nancy, France. Electronic address: emmanuel.vincent@inria.fr.