Indexing Spoken Documents with Hierarchical Semantic Structures: Semantic Tree-to-string Alignment Models
Xiaodan Zhu, Colin Cherry, Gerald M. Penn · NPARC · 2011
This paper addresses a semantic tree-to-string alignment problem: indexing spoken documents with known hierarchical semantic structures, with the goal to help index and access such archives. We propose and study a number of alignment models of different modeling capabilities and time complexities to provide a comprehensive understanding of these unsupervised models and hence the problem itself.