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Open AccessProceedings Article

A machine learning approach to building domain-specific search engines

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TLDR
The use of machine learning techniques are proposed to greatly automate the creation and maintenance of domain-specific search engines and new research in reinforcement learning, text classification and information extraction that enables efficient spidering, populates topic hierarchies, and identifies informative text segments is described.
Abstract
Domain-specific search engines are becoming increasingly popular because they offer increased accuracy and extra features not possible with general, Web-wide search engines. Unfortunately, they are also difficult and time-consuming to maintain. This paper proposes the use of machine learning techniques to greatly automate the creation and maintenance of domain-specific search engines. We describe new research in reinforcement learning, text classification and information extraction that enables efficient spidering, populates topic hierarchies, and identifies informative text segments. Using these techniques, we have built a demonstration system: a search engine for computer science research papers available at www.cora.justrcsettrch.com.

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Web mining research: a survey

TL;DR: This paper surveys the research in the area of Web mining, point out some confusions regarded the usage of the term Web mining and suggest three Web mining categories, which are then situate some of the research with respect to these three categories.
Proceedings Article

Focused Crawling Using Context Graphs

TL;DR: A focused crawling algorithm is presented that builds a model for the context within which topically relevant pages occur on the web that can capture typical link hierarchies within which valuable pages occur, as well as model content on documents that frequently cooccur with relevant pages.
Journal ArticleDOI

The nested chinese restaurant process and bayesian nonparametric inference of topic hierarchies

TL;DR: The nested Chinese restaurant process (nCRP) as discussed by the authors is a stochastic process that assigns probability distributions to ensembles of infinitely deep, infinitely branching trees, and it can be used as a prior distribution in a Bayesian nonparametric model of document collections.
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The nested Chinese restaurant process and Bayesian nonparametric inference of topic hierarchies

TL;DR: An application to information retrieval in which documents are modeled as paths down a random tree, and the preferential attachment dynamics of the nCRP leads to clustering of documents according to sharing of topics at multiple levels of abstraction.

Learning Hidden Markov Model Structure for Information Extraction

TL;DR: It is demonstrated that a manually-constructed model that contains multiple states per extraction field outperforms a model with one state per field, and the use of distantly-labeled data to set model parameters provides a significant improvement in extraction accuracy.
References
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Journal ArticleDOI

A tutorial on hidden Markov models and selected applications in speech recognition

TL;DR: In this paper, the authors provide an overview of the basic theory of hidden Markov models (HMMs) as originated by L.E. Baum and T. Petrie (1966) and give practical details on methods of implementation of the theory along with a description of selected applications of HMMs to distinct problems in speech recognition.
Journal ArticleDOI

Reinforcement learning: a survey

TL;DR: Central issues of reinforcement learning are discussed, including trading off exploration and exploitation, establishing the foundations of the field via Markov decision theory, learning from delayed reinforcement, constructing empirical models to accelerate learning, making use of generalization and hierarchy, and coping with hidden state.
Journal ArticleDOI

Error bounds for convolutional codes and an asymptotically optimum decoding algorithm

TL;DR: The upper bound is obtained for a specific probabilistic nonsequential decoding algorithm which is shown to be asymptotically optimum for rates above R_{0} and whose performance bears certain similarities to that of sequential decoding algorithms.
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Reinforcement Learning: A Survey

TL;DR: A survey of reinforcement learning from a computer science perspective can be found in this article, where the authors discuss the central issues of RL, including trading off exploration and exploitation, establishing the foundations of RL via Markov decision theory, learning from delayed reinforcement, constructing empirical models to accelerate learning, making use of generalization and hierarchy, and coping with hidden state.