no code implementations • 10 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.
1 code implementation • 15 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 $\mathcal{X}$.
no code implementations • 26 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.
no code implementations • 30 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.
no code implementations • 11 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.
no code implementations • 9 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