NDLI: Processing continuous text queries featuring non-homogeneous scoring functions

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Processing continuous text queries featuring non-homogeneous scoring functions

Content Provider	ACM Digital Library
Author	Amann, Bernd Christophides, Vassilis Vouzoukidou, Nelly
Abstract	In this work we are interested in the scalable processing of content filtering queries over text item streams. In particular, we are aiming to generalize state of the art solutions with non-homogeneous scoring functions combining query-independent item importance with query-dependent content relevance. While such complex ranking functions are widely used in web search engines this is to our knowledge the first scientific work studying their usage in a continuous query scenario. Our main contribution consists in the definition and the evaluation of new efficient in-memory data structures for indexing continuous top-k queries based on an original two-dimensional representation of text queries. We are exploring locally-optimal score bounds and heuristics that efficiently prune the search space of candidate top-k query results which have to be updated at the arrival of new stream items. Finally, we experimentally evaluate memory/matching time trade-offs of these index structures. In particular we experimentally illustrate their linear scaling behavior with respect to the number of indexed queries.
Starting Page	1065
Ending Page	1074
Page Count	10
File Format	PDF
ISBN	9781450311564
DOI	10.1145/2396761.2398404
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2012-10-29
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Continuous top-k query processing Non-homogeneous scoring functions Text streams
Content Type	Text
Resource Type	Article

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