PASCAL - Pattern Analysis, Statistical Modelling and Computational Learning

Filtering-Ranking Perceptron Learning for Partial Parsing
Xavier Carreras, Lluís Màrquez and Jorge Castro
Machine Learning Volume 60, Number 1-3, pp. 41-71, 2005. ISSN 0885-6125

Abstract

This work introduces a general phrase recognition system based on perceptrons, and a global online learning algorithm to train them together. The method applies to complex domains in which some structure has to be recognized. This global problem is broken down into two layers of local subproblems: a filtering layer, which reduces the search space by identifying plausible phrase candidates; and a ranking layer, which builds the optimal phrase structure by discriminating among competing phrases. A recognition-based feedback rule is presented which reflects to each local function its committed errors from a global point of view, and allows to train them together online as perceptrons. As a result, the learned functions automatically behave as filters and rankers, rather than binary classifiers, which we argue to be better for this type of problems. Extensive experimentation on partial parsing tasks gives state-of-the-art results and evinces the advantages of the global training method over optimizing each function locally and independently.

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EPrint Type:Article
Project Keyword:Project Keyword UNSPECIFIED
Subjects:Natural Language Processing
ID Code:1593
Deposited By:Xavier Carreras
Deposited On:28 November 2005