## News

### The webcast of the kick-off meeting of the Paris-Saclay Center for Data Science

### The webcast of my CERN talk on machine learning in high-energy physics

### The HiggsML challenge

### Interview (in French) with me in the Lettre IN2P3 Infomatique

The original English version### New machine learning paper

B. Kégl

A (missing)
boosting-type convergence result for AdaBoost.MH with factorized
multi-class classifiers

In Conference on Computational Learning Theory (open problems
track), 2014.

In this companion paper we showed that AdaBoost.MH works very well in practice with factorized base classifiers. This note states the open problem of the exponential convergence of the algorithm.

B. Kégl

The return of
AdaBoost.MH: multi-class Hamming trees

In International Conference on Learning Representations, 2014.

We train vector-valued decision trees within the framework of AdaBoost.MH. The key element of the method is a vector-valued decision stump, factorized into an input-independent vector of length K and label-independent scalar classifier.

B. Kégl

Correlation-based
construction of neighborhood and edge features

In International Conference on Learning Representations (workshop
track), 2014.

Motivated by an abstract notion of low-level edge detector filters, we propose a simple method of unsupervised feature construction based on pairwise statistics of features. In the first step, we construct neighborhoods of features by regrouping features that correlate. Then we use these subsets as filters to produce new neighborhood features. Next, we connect neighborhood features that correlate, and construct edge features by subtracting the correlated neighborhood features of each other.

B. Kégl

Introduction to
multivariate discrimination

In T. Delemontex and A. Lucotte, editors, SOS
2012 – IN2P3 School of Statistics. EPJ Web of Conferences, 2013.

For physicists and other practicioners.

### New physics paper

P. Abreu et
al.

Muons in air showers at
the Pierre Auger Observatory: Measurement of atmospheric production
depth

Physical Review Letters D, 90:012012, 2014

Auger Collaboration paper.