Overview: Presents techniques of query understanding and reformulation for search engines, including query classification, query tagging, query suggestion, query auto completion, and spelling correction.ProvideThis book presents a systematic study of practices and theories for query understanding of search engines. These studies can be categorized into three major classes. The first class is to figure out what the searcher wants by extracting semantic meaning from the searcher’s keywords, such as query classification, query tagging, and query intent understanding. The second class is to analyz
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