Search Results for author: Wouter Duivesteijn

Found 7 papers, 1 papers with code

Beyond Discriminant Patterns: On the Robustness of Decision Rule Ensembles

no code implementations21 Sep 2021 Xin Du, Subramanian Ramamoorthy, Wouter Duivesteijn, Jin Tian, Mykola Pechenizkiy

Specifically, we propose to leverage causal knowledge by regarding the distributional shifts in subpopulations and deployment environments as the results of interventions on the underlying system.

Softmax-based Classification is k-means Clustering: Formal Proof, Consequences for Adversarial Attacks, and Improvement through Centroid Based Tailoring

no code implementations7 Jan 2020 Sibylle Hess, Wouter Duivesteijn, Decebal Mocanu

We formally prove that networks with a small Lipschitz modulus (which corresponds to a low susceptibility to adversarial attacks) map data points closer to the cluster centroids, which results in a mapping to a k-means-friendly space.

Clustering

k is the Magic Number -- Inferring the Number of Clusters Through Nonparametric Concentration Inequalities

no code implementations4 Jul 2019 Sibylle Hess, Wouter Duivesteijn

In this paper, we strive to determine the number of clusters by answering a simple question: given two clusters, is it likely that they jointly stem from a single distribution?

Clustering

The SpectACl of Nonconvex Clustering: A Spectral Approach to Density-Based Clustering

no code implementations1 Jul 2019 Sibylle Hess, Wouter Duivesteijn, Philipp Honysz, Katharina Morik

When it comes to clustering nonconvex shapes, two paradigms are used to find the most suitable clustering: minimum cut and maximum density.

Clustering Clustering Algorithms Evaluation

Adversarial Balancing-based Representation Learning for Causal Effect Inference with Observational Data

2 code implementations30 Apr 2019 Xin Du, Lei Sun, Wouter Duivesteijn, Alexander Nikolaev, Mykola Pechenizkiy

The challenges for this problem are two-fold: on the one hand, we have to derive a causal estimator to estimate the causal quantity from observational data, where there exists confounding bias; on the other hand, we have to deal with the identification of CATE when the distribution of covariates in treatment and control groups are imbalanced.

Causal Inference Representation Learning +2

Controversy Rules - Discovering Regions Where Classifiers (Dis-)Agree Exceptionally

no code implementations22 Aug 2018 Oren Zeev-Ben-Mordehai, Wouter Duivesteijn, Mykola Pechenizkiy

Finding regions for which there is higher controversy among different classifiers is insightful with regards to the domain and our models.

General Classification General Knowledge

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