Method and system for information retrieval

Abstract

The invention discloses a method and system for information retrieval. The method for information retrieval comprises the steps of (1) carrying out the quadratic mapping process on a basic QA word list on the basis of extension of a query to generate a second-level mapped QA word list, wherein the basic QA word list comprises mapping from a high-frequency query to a keyword, first-level mapping in the second-level mapped QA word list is mapping from an extended query to the high-frequency query, and second-level mapping in the second-level mapped QA word list is mapping from the high-frequency query to the keyword; (2) carrying out searching on the second-level mapped QA word list according to an obtained query in an information retrieval request to obtain a keyword hit by the query, extracting posted internet information corresponding to the keyword, and using the posted internet information as a retrieval result. According to the method and system for information retrieval, the coverage rate of information retrieval results to the posted internet information can be improved.

Description

technical field [0001] The present invention relates to the technical field of the Internet, in particular to an information retrieval method and system. Background technique [0002] In the existing information retrieval publishing system, the retrieval is performed according to the retrieval method of the traditional webpage search, that is, according to the "AND" operation of multiple core morphemes in the retrieval string (query), for example: a certain retrieval string contains A, B, C For these three core morphemes, according to the retrieval method of traditional webpage search, that is, to search according to the "AND" operation of A, B, and C, that is, to match the three core morphemes of A, B, and C at the same time. Information will be retrieved as a search result. [0003] The above retrieval method will lead to a large number of matching without results. Therefore, the current practice is to expand the matching terminal and filter out high-frequency queries (th...

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Problems solved by technology

[0004] However, in the existing retrieval methods and systems, the corresponding keywords can only be matched if the query accurately hits the QA vocabulary, and the correlation between the queries is not fully utilized, resulting in the coverage of the retrieval results on the information published on the Internet. lower

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