Search Results for author: Evgenii Chzhen

Found 13 papers, 2 papers with code

Gradient-free optimization of highly smooth functions: improved analysis and a new algorithm

no code implementations3 Jun 2023 Arya Akhavan, Evgenii Chzhen, Massimiliano Pontil, Alexandre B. Tsybakov

The first algorithm uses a gradient estimator based on randomization over the $\ell_2$ sphere due to Bach and Perchet (2016).

Parameter-free projected gradient descent

no code implementations31 May 2023 Evgenii Chzhen, Christophe Giraud, Gilles Stoltz

We consider the problem of minimizing a convex function over a closed convex set, with Projected Gradient Descent (PGD).

Stochastic Optimization

SignSVRG: fixing SignSGD via variance reduction

no code implementations22 May 2023 Evgenii Chzhen, Sholom Schechtman

The core idea is first instantiated on the problem of minimizing sums of convex and Lipschitz functions and is then extended to the smooth case via variance reduction.

Fair learning with Wasserstein barycenters for non-decomposable performance measures

no code implementations1 Sep 2022 Solenne Gaucher, Nicolas Schreuder, Evgenii Chzhen

In the awareness framework, akin to the classical unconstrained classification case, we show that maximizing accuracy under this fairness constraint is equivalent to solving a corresponding regression problem followed by thresholding at level $1/2$.

Classification Fairness +1

A gradient estimator via L1-randomization for online zero-order optimization with two point feedback

no code implementations27 May 2022 Arya Akhavan, Evgenii Chzhen, Massimiliano Pontil, Alexandre B. Tsybakov

We present a novel gradient estimator based on two function evaluations and randomization on the $\ell_1$-sphere.

A Unified Approach to Fair Online Learning via Blackwell Approachability

no code implementations NeurIPS 2021 Evgenii Chzhen, Christophe Giraud, Gilles Stoltz

We provide a setting and a general approach to fair online learning with stochastic sensitive and non-sensitive contexts.

Fairness

Classification with abstention but without disparities

1 code implementation24 Feb 2021 Nicolas Schreuder, Evgenii Chzhen

Building on this result, we propose a post-processing classification algorithm, which is able to modify any off-the-shelf score-based classifier using only unlabeled sample.

Classification Fairness +1

An example of prediction which complies with Demographic Parity and equalizes group-wise risks in the context of regression

no code implementations13 Nov 2020 Evgenii Chzhen, Nicolas Schreuder

We provide a non-trivial example of a prediction $x \to f(x)$ which satisfies two common group-fairness notions: Demographic Parity \begin{align} (f(X) | S = 1) &\stackrel{d}{=} (f(X) | S = 2) \end{align} and Equal Group-Wise Risks \begin{align} \mathbb{E}[(f^*(X) - f(X))^2 | S = 1] = \mathbb{E}[(f^*(X) - f(X))^2 | S = 2].

Attribute Fairness

On the benefits of output sparsity for multi-label classification

no code implementations14 Mar 2017 Evgenii Chzhen, Christophe Denis, Mohamed Hebiri, Joseph Salmon

The modern multi-label problems are typically large-scale in terms of number of observations, features and labels, and the amount of labels can even be comparable with the amount of observations.

Classification General Classification +2

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