Many approaches to summarization can be very broadly characterized as TERM-BASED: they attempt to identify the main 'topics,' which generally are TERMS, and then to extract from the document the most important information about these terms (Hovy and Lin, 1997).
the kth sentence chosen is the one with the largest index value in the kth right singular vector in matrix The summarization method proposed by Gong and Liu has some disadvantages as well, the main of which is that it is necessary to use the same number of dimensions as is the number of sentences we want to choose for a summary.