Search Results for author: Xavier Fontaine

Found 6 papers, 0 papers with code

Multilingual Clinical NER: Translation or Cross-lingual Transfer?

no code implementations7 Jun 2023 Xavier Fontaine, Félix Gaschi, Parisa Rastin, Yannick Toussaint

However, other methods leveraging translation models can be used to perform NER without annotated data in the target language, by either translating the training set or test set.

Cross-Lingual Transfer named-entity-recognition +3

Quantitative Propagation of Chaos for SGD in Wide Neural Networks

no code implementations NeurIPS 2020 Valentin De Bortoli, Alain Durmus, Xavier Fontaine, Umut Simsekli

In comparison to previous works on the subject, we consider settings in which the sequence of stepsizes in SGD can potentially depend on the number of neurons and the iterations.

Convergence rates and approximation results for SGD and its continuous-time counterpart

no code implementations8 Apr 2020 Xavier Fontaine, Valentin De Bortoli, Alain Durmus

This paper proposes a thorough theoretical analysis of Stochastic Gradient Descent (SGD) with non-increasing step sizes.

Stochastic Optimization

Online A-Optimal Design and Active Linear Regression

no code implementations20 Jun 2019 Xavier Fontaine, Pierre Perrault, Michal Valko, Vianney Perchet

By trying to minimize the $\ell^2$-loss $\mathbb{E} [\lVert\hat{\beta}-\beta^{\star}\rVert^2]$ the decision maker is actually minimizing the trace of the covariance matrix of the problem, which corresponds then to online A-optimal design.

regression

An adaptive stochastic optimization algorithm for resource allocation

no code implementations12 Feb 2019 Xavier Fontaine, Shie Mannor, Vianney Perchet

This can be recast as a specific stochastic optimization problem where the objective is to maximize the cumulative reward, or equivalently to minimize the regret.

Stochastic Optimization

Regularized Contextual Bandits

no code implementations11 Oct 2018 Xavier Fontaine, Quentin Berthet, Vianney Perchet

We consider the stochastic contextual bandit problem with additional regularization.

Multi-Armed Bandits

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