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Mining Meaning from Wikipedia

arXiv.org Artificial Intelligence

Wikipedia is a goldmine of information; not just for its many readers, but also for the growing community of researchers who recognize it as a resource of exceptional scale and utility. It represents a vast investment of manual effort and judgment: a huge, constantly evolving tapestry of concepts and relations that is being applied to a host of tasks. This article provides a comprehensive description of this work. It focuses on research that extracts and makes use of the concepts, relations, facts and descriptions found in Wikipedia, and organizes the work into four broad categories: applying Wikipedia to natural language processing; using it to facilitate information retrieval and information extraction; and as a resource for ontology building. The article addresses how Wikipedia is being used as is, how it is being improved and adapted, and how it is being combined with other structures to create entirely new resources. We identify the research groups and individuals involved, and how their work has developed in the last few years. We provide a comprehensive list of the open-source software they have produced.


A Correspondence Analysis Framework for Author-Conference Recommendations

arXiv.org Machine Learning

For many years, achievements and discoveries made by scientists are made aware through research papers published in appropriate journals or conferences. Often, established scientists and especially newbies are caught up in the dilemma of choosing an appropriate conference to get their work through. Every scientific conference and journal is inclined towards a particular field of research and there is a vast multitude of them for any particular field. Choosing an appropriate venue is vital as it helps in reaching out to the right audience and also to further one's chance of getting their paper published. In this work, we address the problem of recommending appropriate conferences to the authors to increase their chances of acceptance. We present three different approaches for the same involving the use of social network of the authors and the content of the paper in the settings of dimensionality reduction and topic modeling. In all these approaches, we apply Correspondence Analysis (CA) to derive appropriate relationships between the entities in question, such as conferences and papers. Our models show promising results when compared with existing methods such as content-based filtering, collaborative filtering and hybrid filtering.


Learning with Scope, with Application to Information Extraction and Classification

arXiv.org Machine Learning

In probabilistic approaches to classification and information extraction, one typically builds a statistical model of words under the assumption that future data will exhibit the same regularities as the training data. In many data sets, however, there are scope-limited features whose predictive power is only applicable to a certain subset of the data. For example, in information extraction from web pages, word formatting may be indicative of extraction category in different ways on different web pages. The difficulty with using such features is capturing and exploiting the new regularities encountered in previously unseen data. In this paper, we propose a hierarchical probabilistic model that uses both local/scope-limited features, such as word formatting, and global features, such as word content. The local regularities are modeled as an unobserved random parameter which is drawn once for each local data set. This random parameter is estimated during the inference process and then used to perform classification with both the local and global features--- a procedure which is akin to automatically retuning the classifier to the local regularities on each newly encountered web page. Exact inference is intractable and we present approximations via point estimates and variational methods. Empirical results on large collections of web data demonstrate that this method significantly improves performance from traditional models of global features alone.


Cultural Orientation: Classifying Subjective Documents by Cociation Analysis

AAAI Conferences

This paper introduces a simple method for estimating cultural orientation, the affiliations of hypertext documents in a polarized field of discourse. Using a probabilistic model based on cocitation information, two experiments are reported. The first experiment tests the model's ability to discriminate between left-and right-wing documents about politics. In this context the model is tested on two sets of data, 695 partisan web documents, and 162 political weblogs. Accuracy above 90% is obtained from the cocitation model, outperforming lexically based classifiers at statistically significant levels. In the second experiment, the proposed method is used to classify the home pages of musical artists with respect to their mainstream or "alternative" appeal. For musical artists the model is tested on a set of 515 artist home pages, achieving 88% accuracy.


Methods for Domain-Independent Information Extraction from the Web: An Experimental Comparison

AAAI Conferences

Collecting a large body of information by searching the Web can be a tedious, manual process. Consider, for example, compiling a list of the astronauts who have reached earth's orbit, or of the cities in the world, etc. Unless you find the "right" document(s), you are reduced to an error-prone, onefact-at-a-time, piecemeal search.