A Document Descriptor using Covariance of Word Vectors Marwan Torki author 2018-07 text Proceedings of the 56th Annual Meeting of the Association for Computational Linguistics (Volume 2: Short Papers) Iryna Gurevych editor Yusuke Miyao editor Association for Computational Linguistics Melbourne, Australia conference publication torki-2018-document 10.18653/v1/P18-2084 https://aclanthology.org/P18-2084/ 2018-07 527 532