Search Results for author: Clément Levrard

Found 6 papers, 1 papers with code

Topological Analysis for Detecting Anomalies (TADA) in Time Series

no code implementations10 Jun 2024 Frédéric Chazal, Martin Royer, Clément Levrard

This paper introduces new methodology based on the field of Topological Data Analysis for detecting anomalies in multivariate time series, that aims to detect global changes in the dependency structure between channels.

Quantization Time Series +1

Statistical learning on measures: an application to persistence diagrams

1 code implementation15 Mar 2023 Olympio Hacquard, Gilles Blanchard, Clément Levrard

We consider a binary supervised learning classification problem where instead of having data in a finite-dimensional Euclidean space, we observe measures on a compact space $\mathcal{X}$.

Topologically penalized regression on manifolds

no code implementations26 Oct 2021 Olympio Hacquard, Krishnakumar Balasubramanian, Gilles Blanchard, Clément Levrard, Wolfgang Polonik

We study a regression problem on a compact manifold M. In order to take advantage of the underlying geometry and topology of the data, the regression task is performed on the basis of the first several eigenfunctions of the Laplace-Beltrami operator of the manifold, that are regularized with topological penalties.

regression

ATOL: Measure Vectorization for Automatic Topologically-Oriented Learning

no code implementations30 Sep 2019 Martin Royer, Frédéric Chazal, Clément Levrard, Umeda Yuhei, Ike Yuichi

Robust topological information commonly comes in the form of a set of persistence diagrams, finite measures that are in nature uneasy to affix to generic machine learning frameworks.

BIG-bench Machine Learning Time Series Analysis +1

Robust Bregman Clustering

no code implementations11 Dec 2018 Aurélie Fischer, Clément Levrard, Claire Brécheteau

Using a trimming approach, we investigate a k-means type method based on Bregman divergences for clustering data possibly corrupted with clutter noise.

Clustering

Stability and Minimax Optimality of Tangential Delaunay Complexes for Manifold Reconstruction

no code implementations9 Dec 2015 Eddie Aamari, Clément Levrard

A similar result is also derived in a model with outliers.

Statistics Theory Statistics Theory I.3.5; G.1.2; G.3

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