Search Results for author: Olivier Wintenberger

Found 18 papers, 3 papers with code

Online Learning Approach for Survival Analysis

no code implementations7 Feb 2024 Camila Fernandez, Pierre Gaillard, Joseph de Vilmarest, Olivier Wintenberger

We introduce an online mathematical framework for survival analysis, allowing real time adaptation to dynamic environments and censored data.

Survival Analysis

Adaptive Probabilistic Forecasting of Electricity (Net-)Load

no code implementations24 Jan 2023 Joseph de Vilmarest, Jethro Browell, Matteo Fasiolo, Yannig Goude, Olivier Wintenberger

The proliferation of local generation, demand response, and electrification of heat and transport are changing the fundamental drivers of electricity load and increasing the complexity of load modelling and forecasting.

Load Forecasting Uncertainty Quantification

Optimistically Tempered Online Learning

no code implementations18 Jan 2023 Maxime Haddouche, Olivier Wintenberger, Benjamin Guedj

Optimistic Online Learning algorithms have been developed to exploit expert advices, assumed optimistically to be always useful.

Learning from time-dependent streaming data with online stochastic algorithms

no code implementations25 May 2022 Antoine Godichon-Baggioni, Nicklas Werge, Olivier Wintenberger

This paper addresses stochastic optimization in a streaming setting with time-dependent and biased gradient estimates.

Stochastic Optimization

Non-Asymptotic Analysis of Stochastic Approximation Algorithms for Streaming Data

no code implementations15 Sep 2021 Antoine Godichon-Baggioni, Nicklas Werge, Olivier Wintenberger

We provide non-asymptotic convergence rates of various gradient-based algorithms; this includes the famous Stochastic Gradient (SG) descent (a. k. a.

Viking: Variational Bayesian Variance Tracking

no code implementations16 Apr 2021 Joseph de Vilmarest, Olivier Wintenberger

We introduce an augmented model in which the variances are represented as auxiliary gaussian latent variables in a tracking mode.

Time Series Time Series Forecasting

Hidden regular variation for point processes and the single/multiple large point heuristic

no code implementations12 Feb 2021 Clément Dombry, Charles Tillier, Olivier Wintenberger

We consider regular variation for marked point processes with independent heavy-tailed marks and prove a single large point heuristic: the limit measure is concentrated on the cone of point measures with one single point.

Point Processes Probability

Stochastic Online Convex Optimization. Application to probabilistic time series forecasting

no code implementations1 Feb 2021 Olivier Wintenberger

We introduce a general framework of stochastic online convex optimization to obtain fast-rate stochastic regret bounds.

Probabilistic Time Series Forecasting Time Series +1

AdaVol: An Adaptive Recursive Volatility Prediction Method

1 code implementation3 Jun 2020 Nicklas Werge, Olivier Wintenberger

An investigation of the convergence properties of the QML procedure in a general conditionally heteroscedastic time series model is conducted, and the classical batch optimization routines extended to the framework of streaming and large-scale problems.

Time Series Time Series Analysis

Kalman Recursions Aggregated Online

no code implementations26 Feb 2020 Eric Adjakossa, Yannig Goude, Olivier Wintenberger

In this article, we aim at improving the prediction of expert aggregation by using the underlying properties of the models that provide expert predictions.

Stochastic Online Optimization using Kalman Recursion

no code implementations10 Feb 2020 Joseph de Vilmarest, Olivier Wintenberger

Second, for generalized linear regressions, we provide a martingale analysis of the excess risk in the local phase, improving existing ones in bounded stochastic optimization.

Stochastic Optimization

Consistent Regression using Data-Dependent Coverings

1 code implementation4 Jul 2019 Vincent Margot, Jean-Patrick Baudry, Frédéric Guilloux, Olivier Wintenberger

The proof of the consistency is based on a control of the error of the empirical estimation of conditional expectations which is interesting on its own.

regression

Sparse regular variation

no code implementations1 Jul 2019 Meyer Nicolas, Olivier Wintenberger

Regular variation provides a convenient theoretical framework to study large events.

Logarithmic Regret for parameter-free Online Logistic Regression

no code implementations26 Feb 2019 Joseph De Vilmarest, Olivier Wintenberger

We consider online optimization procedures in the context of logistic regression, focusing on the Extended Kalman Filter (EKF).

regression

Rule Induction Partitioning Estimator

2 code implementations12 Jul 2018 Vincent Margot, Jean-Patrick Baudry, Frederic Guilloux, Olivier Wintenberger

RIPE is a novel deterministic and easily understandable prediction algorithm developed for continuous and discrete ordered data.

Efficient online algorithms for fast-rate regret bounds under sparsity

no code implementations NeurIPS 2018 Pierre Gaillard, Olivier Wintenberger

setting, we establish new risk bounds that are adaptive to the sparsity of the problem and to the regularity of the risk (ranging from a rate 1 / $\sqrt T$ for general convex risk to 1 /T for strongly convex risk).

A Strongly Quasiconvex PAC-Bayesian Bound

no code implementations19 Aug 2016 Niklas Thiemann, Christian Igel, Olivier Wintenberger, Yevgeny Seldin

We propose a new PAC-Bayesian bound and a way of constructing a hypothesis space, so that the bound is convex in the posterior distribution and also convex in a trade-off parameter between empirical performance of the posterior distribution and its complexity.

Optimal learning with Bernstein Online Aggregation

no code implementations4 Apr 2014 Olivier Wintenberger

The exponential weights include an accuracy term and a second order term that is a proxy of the quadratic variation as in Hazan and Kale (2010).

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