Applying Unsupervised Learning To Support Vector Space Model Based Speaking Assessment Lei Chen author 2013-06 text Proceedings of the Eighth Workshop on Innovative Use of NLP for Building Educational Applications Joel Tetreault editor Jill Burstein editor Claudia Leacock editor Association for Computational Linguistics Atlanta, Georgia conference publication chen-2013-applying https://aclanthology.org/W13-1707/ 2013-06 58 62