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- Julien Audiffren, Hachem Kadri
- ACML
- 2013

We study the stability properties of nonlinear multi-task regression in reproducing Hilbert spaces with operator-valued kernels. Such kernels, a.k.a. multi-task kernels, are appropriate for learning problems with nonscalar outputs like multi-task learning and structured output prediction. We show that multi-task kernel regression algorithms are uniformly… (More)

In this paper 1 we consider the problems of supervised classification and regression in the case where attributes and labels are functions: a data is represented by a set of functions, and the label is also a function. We focus on the use of reproducing kernel Hilbert space theory to learn from such functional data. Basic concepts and properties of… (More)

- Julien Audiffren, Hachem Kadri
- ArXiv
- 2013

We consider the problem of learning a vector-valued function f in an online learning setting. The function f is assumed to lie in a reproducing Hilbert space of operator-valued kernels. We describe two online algorithms for learning f while taking into account the output structure. A first contribution is an algorithm, ONORMA, that extends the standard… (More)

A popular approach to apprenticeship learning (AL) is to formulate it as an inverse reinforcement learning (IRL) problem. The MaxEnt-IRL algorithm successfully integrates the maximum en-tropy principle into IRL and unlike its predecessors, it resolves the ambiguity arising from the fact that a possibly large number of policies could match the expert's… (More)

We consider the accumulation of deleterious mutations in an asexual population , a phenomenon known as Muller's ratchet, using the continuous time model proposed in [4]. We show that for any parameter λ > 0 (the rate at which mutations occur), for any α > 0 (the toxicity of the mutations) and for any size N > 0 of the population, the ratchet clicks a.s. in… (More)

- Julien Audiffren, Liva Ralaivola
- NIPS
- 2015

We study the restless bandit problem where arms are associated with stationary ϕ-mixing processes and where rewards are therefore dependent: the question that arises from this setting is that of carefully recovering some independence by 'ig-noring' the values of some rewards. As we shall see, the bandit problem we tackle requires us to address the… (More)

- Julien Audiffren, Emile Contal
- Sensors
- 2016

During the past few years, the Nintendo Wii Balance Board (WBB) has been used in postural control research as an affordable but less reliable replacement for laboratory grade force platforms. However, the WBB suffers some limitations, such as a lower accuracy and an inconsistent sampling rate. In this study, we focus on the latter, namely the non uniform… (More)

- Julien Audiffren
- 2012

We consider Muller's ratchet Fleming-Viot model with compensatory mutations , which is an infinite system of SDE used to study the accumulation of deleterious mutations in asexual population including mutations and selection. We construct a specific look-down model, and we prove that it is equivalent to the previous Muller's ratchet model.

- Julien Audiffren, Ioannis Bargiotas, Nicolas Vayatis, Pierre-Paul Vidal, Damien Ricard
- PloS one
- 2016

Almost one third of population 65 years-old and older faces at least one fall per year. An accurate evaluation of the risk of fall through simple and easy-to-use measurements is an important issue in current clinic. A common way to evaluate balance in posturography is through the recording of the centre-of-pressure (CoP) displacement (statokinesigram) with… (More)

- Thomas Moreau, Julien Audiffren
- ArXiv
- 2016

—One of the main challenges of deep learning methods is the choice of an appropriate training strategy. In particular, additional steps, such as unsupervised pre-training, have been shown to greatly improve the performances of deep structures. In this paper, we introduce a new training step,the post-training, which takes place after the training and where… (More)