PASCAL - Pattern Analysis, Statistical Modelling and Computational Learning

Boosting Multi-Task Weak Learners with Applications to Textual and Social Data
Jean-Baptiste Faddoul, Boris Chidlovskii, Fabien Torre and Rémi Gilleron
In: ICMLA 2010, Dec 2010, Washington.


Learning multiple related tasks from data simultaneously can improve predictive performance relative to learning these tasks independently. In this paper we propose a novel multi-task learning algorithm called MT-Adaboost: it extends Adaboost algorithm to the multi-task setting; it uses as multi-task weak classifier a multi-task decision stump. This allows to learn different dependencies between tasks for different regions of the learning space. Thus, we relax the conventional hypothesis that tasks behave similarly in the whole learning space. Moreover, MT-Adaboost can learn multiple tasks without imposing the constraint of sharing the same label set and/or examples between tasks. A theoretical analysis is derived from the analysis of the original Adaboost. Experiments for multiple tasks over large scale textual data sets with social context (Enron and Tobacco) give rise to very promising results.

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EPrint Type:Conference or Workshop Item (Paper)
Project Keyword:Project Keyword UNSPECIFIED
Subjects:Theory & Algorithms
ID Code:7270
Deposited By:Rémi Gilleron
Deposited On:16 March 2011