PASCAL - Pattern Analysis, Statistical Modelling and Computational Learning

Hands-on Pattern Recognition: Challenges in Machine Learning, volume 1
Isabelle Guyon, Gavin Cawley, Gideon Dror and Amir Saffari, ed. (2011) Challenges in Machine Learning , Volume 1 . Microtome Publishing , Brookline, MA . ISBN 978-0-9719777-1-6


Recently organized competitions have been instrumental in pushing the state-of-the-art in machine learning, establishing benchmarks to fairly evaluate methods, and identifying techniques, which really work. This book harvests three years of effort of hundreds of researchers who have participated to three competitions we organized around five datasets from various application domains. Three aspects were explored: • Data representation. • Model selection. • Performance prediction. With the proper data representation, learning becomes almost trivial. For the defenders of fully automated data processing, the search for better data representations is just part of learning. At the other end of the spectrum, domain specialists engineer data representations, which are tailored to particular applications. The results of the “Agnostic Learning vs. Prior Knowledge” challenge are discussed in the book, including longer versions of the best papers from the IJCNN 2007 workshop on “Data Representation Discovery” where the best competitors presented their results. Given a family of models with adjustable parameters, Machine Learning provides us with means of “learning from examples” and obtaining a good predictive model. The problem be- comes more arduous when the family of models possesses so-called hyper-parameters or when it consists of heterogenous entities (e.g. linear models, neural networks, classification and re- gression trees, kernel methods, etc.) Both practical and theoretical considerations may yield to split the problem into multiple levels of inference. Typically, at the lower level, the parame- ters of individual models are optimized and at the second level the best model is selected, e.g. via cross-validation. This problem is often referred to as model selection. The results of the “Model Selection Game” are included in this book as well as the best papers of the NIPS 2006 “Multi-level Inference” workshop. In most real world situations, it is not sufficient to provide a good predictor, it is important to assess accurately how well this predictor will perform on new unseen data. Before deploying a model in the field, one must know whether it will meet the specifications or whether one should invest more time and resources to collect additional data and/or develop more sophisticated models. The performance prediction challenge asked participants to provide prediction results on new unseen test data AND to predict how good these predictions were going to be on a test set for which they did not know the labels ahead of time. Therefore, participants had to design both a good predictive model and a good performance estimator. The results of the “Performance Prediction Challenge” and the best papers of the “WCCI 2006 workshop of model selection” will be included in the book. A selection of the special topic of JMLR on model selection, including longer contributions of the best challenge participants, are also reprinted in the book.

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EPrint Type:Book
Project Keyword:Project Keyword UNSPECIFIED
Subjects:Learning/Statistics & Optimisation
Theory & Algorithms
ID Code:9179
Deposited By:Isabelle Guyon
Deposited On:21 February 2012