Read e-book online A Feature-Centric View of Information Retrieval PDF

By Donald Metzler

ISBN-10: 3642228976

ISBN-13: 9783642228971

Commercial net se's equivalent to Google, Yahoo, and Bing are used each day by means of hundreds of thousands of individuals around the globe. With their ever-growing refinement and utilization, it has develop into more and more tough for tutorial researchers to maintain with the gathering sizes and different severe learn concerns with regards to internet seek, which has created a divide among the data retrieval study being performed inside of academia and undefined. Such huge collections pose a brand new set of demanding situations for info retrieval researchers.

In this paintings, Metzler describes powerful details retrieval versions for either smaller, classical information units, and bigger net collections. In a shift clear of heuristic, hand-tuned rating capabilities and intricate probabilistic types, he offers feature-based retrieval types. The Markov random box version he info is going past the normal but ill-suited bag of phrases assumption in methods. First, the version can simply take advantage of a number of sorts of dependencies that exist among question phrases, putting off the time period independence assumption that regularly accompanies bag of phrases versions. moment, arbitrary textual or non-textual positive factors can be utilized in the version. As he exhibits, combining time period dependencies and arbitrary gains ends up in a really strong, robust retrieval version. furthermore, he describes a number of extensions, akin to an automated characteristic choice set of rules and a question growth framework. The ensuing version and extensions offer a versatile framework for powerful retrieval throughout a variety of initiatives and knowledge sets.

A Feature-Centric View of knowledge Retrieval presents graduate scholars, in addition to educational and commercial researchers within the fields of data retrieval and net seek with a contemporary point of view on details retrieval modeling and net searches.

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We now must show how these nodes can be connected together. As explained before, the Markov Property dictates the dependence semantics of the MRF. Therefore, it is relatively straightforward to explore various independence assumptions by constructing MRFs with different graph structures. We consider three generalized graph structures, each with different underlying independence assumptions. The three structures are full independence (FI), sequential dependence (SD), and full dependence (FD). 2 shows graphical model representations of each.

Showed that this model consistently outperformed unigram language models across a number of data sets using description-length queries (Gao et al. 2004). Unfortunately, the model, as described, performs poorly on title-length queries. The model is a generalization of Jelinek–Mercer smoothing, which is known to work well on longer queries (Zhai and Lafferty 2004). Therefore, the model must be adjusted to be more like Dirichlet smoothing in order to perform 1 . We note that this well on title queries.

It has been shown that intelligently constructed manual queries can significantly outperform automatically generated queries (Metzler and Croft 2004). However, the query language is too complex for novice users to use successfully. Only expert users, such as information analysts and librarians, are likely to benefit from such a query language. For this reason, algorithmic query construction is important. Despite its success, the Indri retrieval model does not provide a formal mechanism for learning how to combine various types of evidence, making use of arbitrary evidence, or automatically converting a short keyword query into a rich structured query.

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A Feature-Centric View of Information Retrieval by Donald Metzler

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