A Query Expansion Method for Conversational Entity Search

A query expansion and entity technology, applied in the field of entity search, can solve problems that affect user queries, prolong the query process, and not consider the role of historical factors, so as to avoid single-round query drift, shorten the query process, and fully understand user intentions Effect

CN107943919BActive Publication Date: 2019-11-12HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-11-12

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Abstract

The invention discloses a conversational entity search-oriented query expansion method. The method comprises the steps of preprocessing a Wikipedia document set to obtain a data set D; traversing eachdocument d in the data set D to obtain a keyword reverse index Ik, an entity reverse index Ie and entity class mapping IE; extracting semantic information in WordNet and entity related information inYAGO3; according to a historical query result, constructing a historical result cache queue L; according to a current query Q of a user, retrieving Ik, Ie and IE to obtain pseudo-relevance feedback QPRF, and analyzing the historical result in L by utilizing the semantic information and the entity related information to obtain historical feedback Qh; based on the current query Q, the pseudo-relevance feedback QPRF and the historical feedback Qh, generating an extended query QE, and re-retrieving and sorting Ik, Ie and IE by utilizing QE to obtain a final result set R; and updating the cache queue L by utilizing R. The query process is shortened while the query overhead is reduced.
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Description

technical field

[0001] The present invention relates to the field of entity search, and more specifically, relates to a query expansion method for conversational entity search. Background technique

[0002] Conversational entity search is to quickly and accurately retrieve subject-related entity objects (such as people, organizations, locations, etc.) and corresponding attributes in Web data through multiple rounds of user-interactive query. Compared with traditional entity search, conversational entity search decomposes user intent into a series of queries. In each round of query, users will propose new queries or modify original queries based on the results of historical queries. In this case, the information described by a single round of query is generally incomplete. At the same time, the continuous evolution of the query may also cause the content of the conversation to deviate from the target topic. Consistency is a key problem to be solved by conversational entity s...

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Embodiment Construction

[0053] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0054] In order to quickly guide users to obtain more accurate search results and improve user experience in conversational entity search, it is necessary to design a query expansion method suitable for conversational entity search to avoid single-round query drift in existing methods , Inconsistent conversation topics during query process extension and expansion.

[0055] The historical result...