26 juillet 2017
https://creativecommons.org/licenses/by-nc-nd/4.0/ , info:eu-repo/semantics/openAccess
Danilo Croce et al., « Nyström Methods for Efficient Kernel-Based Methods for Community Question Answering », Accademia University Press, ID : 10.4000/books.aaccademia.1758
Expressive but complex kernel functions, such as Sequence or Tree kernels, are usually underemployed in NLP tasks, e.g., in community Question Answering (cQA), as for their significant complexity in both learning and classification stages. Recently, the Nyström methodology for data embedding has been proposed as a viable solution to scalability problems. By mapping data into low-dimensional approximations of kernel spaces, it positively increases scalability through compact linear representations for highly structured data. In this paper, we show that Nyström methodology can be effectively used to apply a kernel-based method in the cQA task, achieving state-of-the-art results by reducing the computational cost of orders of magnitude.