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 similar to Google, Yahoo, and Bing are used on a daily basis by means of thousands of individuals around the globe. With their ever-growing refinement and utilization, it has turn into more and more tricky for educational researchers to maintain with the gathering sizes and different serious examine matters regarding net seek, which has created a divide among the data retrieval study being performed inside 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 versions, he provides 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 make the most numerous forms of dependencies that exist among question phrases, taking out the time period independence assumption that frequently accompanies bag of phrases versions. moment, arbitrary textual or non-textual positive factors can be utilized in the version. As he indicates, combining time period dependencies and arbitrary positive factors ends up in a really powerful, robust retrieval version. furthermore, he describes a number of extensions, corresponding to an automated characteristic choice set of rules and a question enlargement framework. The ensuing version and extensions supply a versatile framework for powerful retrieval throughout a variety of projects and knowledge sets.

A Feature-Centric View of knowledge Retrieval offers graduate scholars, in addition to educational and commercial researchers within the fields of knowledge retrieval and net seek with a latest viewpoint on details retrieval modeling and internet searches.

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Extra resources for A Feature-Centric View of Information Retrieval

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Implicit Query Generation The Indri retrieval model can be used in two ways. First, given a simple keyword query, a system can be developed to convert the query into a structured Indri query. This process acts to transform the simple query into a richer representation. For example, phrases, synonyms, or task-specific operators may be automatically added to the query in order to improve effectiveness over the simple keyword query. The Indri retrieval model was successfully used in this capacity during the 2004–2006 TREC Terabyte Tracks (Metzler et al.

Therefore, given this experimental evidence, we decide to set N = 4 for use with the basic MRF-SD model. Now that we have describe why the rationale behind the manual construction of the model, we must see how well it performs compared to the simple MRF-FI model. 6. Results that are statistically significantly better than the MRF-FI model are indicated by a †. 6 Test set results for the MRF-SD model.

Suppose that we were to collect a list of query/document pairs (Q, D), such that some user found document D relevant to query Q. Imagine that such a list was collected across a large sample of users. The resulting list can be thought of as a sample from some underlying population of relevant query/document pairs that are aggregated across users and conditioned on relevance. This, is then, a relevance distribution1 , which is similar in spirit to the one proposed by Lavrenko (2004). It is this distribution, P (Q, D|R = 1), the joint distribution over query and document pairs, conditioned on relevance, that we focus on modeling.

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A Feature-Centric View of Information Retrieval by Donald Metzler

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