Search Results for author: Karim Lounici

Found 11 papers, 3 papers with code

Consistent Long-Term Forecasting of Ergodic Dynamical Systems

no code implementations20 Dec 2023 Prune Inzerilli, Vladimir Kostic, Karim Lounici, Pietro Novelli, Massimiliano Pontil

We study the evolution of distributions under the action of an ergodic dynamical system, which may be stochastic in nature.

Learning invariant representations of time-homogeneous stochastic dynamical systems

1 code implementation19 Jul 2023 Vladimir R. Kostic, Pietro Novelli, Riccardo Grazzi, Karim Lounici, Massimiliano Pontil

We consider the general class of time-homogeneous stochastic dynamical systems, both discrete and continuous, and study the problem of learning a representation of the state that faithfully captures its dynamics.

Learning Theory

Meta Representation Learning with Contextual Linear Bandits

no code implementations30 May 2022 Leonardo Cella, Karim Lounici, Massimiliano Pontil

We aim to leverage this information in order to learn a new downstream bandit task, which shares the same representation.

Meta-Learning Representation Learning

AdaCap: Adaptive Capacity control for Feed-Forward Neural Networks

no code implementations9 May 2022 Katia Meziani, Karim Lounici, Benjamin Riu

AdaCap is the combination of two novel ingredients, the Muddling labels for Regularization (MLR) loss and the Tikhonov operator training scheme.

Memorization

Muddling Label Regularization: Deep Learning for Tabular Datasets

1 code implementation8 Jun 2021 Karim Lounici, Katia Meziani, Benjamin Riu

Deep Learning (DL) is considered the state-of-the-art in computer vision, speech recognition and natural language processing.

Memorization speech-recognition +1

Muddling Labels for Regularization, a novel approach to generalization

no code implementations17 Feb 2021 Karim Lounici, Katia Meziani, Benjamin Riu

The main goal of this paper is to introduce a novel approach to achieve generalization without any data splitting, which is based on a new risk measure which directly quantifies a model's tendency to overfit.

Optimizing generalization on the train set: a novel gradient-based framework to train parameters and hyperparameters simultaneously

1 code implementation11 Jun 2020 Karim Lounici, Katia Meziani, Benjamin Riu

We observe in our experiments a significantly smaller runtime for our methods as compared to benchmark methods for equivalent prediction score.

feature selection

Large scale Lasso with windowed active set for convolutional spike sorting

no code implementations28 Jun 2019 Laurent Dragoni, Rémi Flamary, Karim Lounici, Patricia Reynaud-Bouret

Spike sorting is a fundamental preprocessing step in neuroscience that is central to access simultaneous but distinct neuronal activities and therefore to better understand the animal or even human brain.

Spike Sorting

Concentration bounds for linear Monge mapping estimation and optimal transport domain adaptation

no code implementations24 May 2019 Rémi Flamary, Karim Lounici, André Ferrari

This article investigates the quality of the estimator of the linear Monge mapping between distributions.

Domain Adaptation

Nuclear norm penalization and optimal rates for noisy low rank matrix completion

no code implementations29 Nov 2010 Vladimir Koltchinskii, Alexandre B. Tsybakov, Karim Lounici

We show that the obtained rates are optimal up to logarithmic factors in a minimax sense and also derive, for any fixed matrix $A_0$, a non-minimax lower bound on the rate of convergence of our estimator, which coincides with the upper bound up to a constant factor.

Low-Rank Matrix Completion regression +1

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