Search Results for author: Matthijs van Leeuwen

Found 16 papers, 10 papers with code

Graph Neural Networks based Log Anomaly Detection and Explanation

1 code implementation2 Jul 2023 Zhong Li, Jiayang Shi, Matthijs van Leeuwen

Event logs are widely used to record the status of high-tech systems, making log anomaly detection important for monitoring those systems.

Anomaly Detection

Explainable Contextual Anomaly Detection using Quantile Regression Forests

1 code implementation22 Feb 2023 Zhong Li, Matthijs van Leeuwen

Traditional anomaly detection methods aim to identify objects that deviate from most other objects by treating all features equally.

Contextual Anomaly Detection regression

A Survey on Explainable Anomaly Detection

no code implementations13 Oct 2022 Zhong Li, Yuxuan Zhu, Matthijs van Leeuwen

In the past two decades, most research on anomaly detection has focused on improving the accuracy of the detection, while largely ignoring the explainability of the corresponding methods and thus leaving the explanation of outcomes to practitioners.

Anomaly Detection

Truly Unordered Probabilistic Rule Sets for Multi-class Classification

1 code implementation17 Jun 2022 Lincen Yang, Matthijs van Leeuwen

Still, existing methods have several shortcomings: 1) most recent methods require a binary feature matrix as input, while learning rules directly from numeric variables is understudied; 2) existing methods impose orders among rules, either explicitly or implicitly, which harms interpretability; and 3) currently no method exists for learning probabilistic rule sets for multi-class target variables (there is only one for probabilistic rule lists).

General Classification Multi-class Classification

Robust subgroup discovery

2 code implementations25 Mar 2021 Hugo Manuel Proença, Peter Grünwald, Thomas Bäck, Matthijs van Leeuwen

This novel model class allows us to formalise the problem of optimal robust subgroup discovery using the Minimum Description Length (MDL) principle, where we resort to optimal Normalised Maximum Likelihood and Bayesian encodings for nominal and numeric targets, respectively.

Subgroup Discovery

Estimating Conditional Mutual Information for Discrete-Continuous Mixtures using Multi-Dimensional Adaptive Histograms

1 code implementation13 Jan 2021 Alexander Marx, Lincen Yang, Matthijs van Leeuwen

Further, we show that CMI can be consistently estimated for discrete-continuous mixture variables by learning an adaptive histogram model.

Causal Discovery Information Theory Information Theory Applications

Discovering outstanding subgroup lists for numeric targets using MDL

3 code implementations16 Jun 2020 Hugo M. Proença, Peter Grünwald, Thomas Bäck, Matthijs van Leeuwen

We propose a dispersion-aware problem formulation for subgroup set discovery that is based on the minimum description length (MDL) principle and subgroup lists.

Attribute Subgroup Discovery

Unsupervised Discretization by Two-dimensional MDL-based Histogram

1 code implementation2 Jun 2020 Lincen Yang, Mitra Baratchi, Matthijs van Leeuwen

As the flexibility of our model class comes at the cost of a vast search space, we introduce a heuristic algorithm, named PALM, which Partitions each dimension ALternately and then Merges neighboring regions, all using the MDL principle.

Density Estimation Model Selection +1

Vouw: Geometric Pattern Mining using the MDL Principle

no code implementations21 Nov 2019 Micky Faas, Matthijs van Leeuwen

We introduce geometric pattern mining, the problem of finding recurring local structure in discrete, geometric matrices.

Interpretable multiclass classification by MDL-based rule lists

3 code implementations1 May 2019 Hugo M. Proença, Matthijs van Leeuwen

Interpretable classifiers have recently witnessed an increase in attention from the data mining community because they are inherently easier to understand and explain than their more complex counterparts.

Classification General Classification +1

Learning what matters - Sampling interesting patterns

no code implementations7 Feb 2017 Vladimir Dzyuba, Matthijs van Leeuwen

We compare the performance of the proposed algorithm to the state-of-the-art in interactive pattern mining by emulating the interests of a user.

Learning-To-Rank

Local Subspace-Based Outlier Detection using Global Neighbourhoods

1 code implementation1 Nov 2016 Bas van Stein, Matthijs van Leeuwen, Thomas Bäck

In highly complex and high-dimensional data, however, existing methods are likely to overlook important outliers because they do not explicitly take into account that the data is often a mixture distribution of multiple components.

Fraud Detection Outlier Detection

Flexible constrained sampling with guarantees for pattern mining

1 code implementation28 Oct 2016 Vladimir Dzyuba, Matthijs van Leeuwen, Luc De Raedt

Several sampling algorithms have been proposed, but each of them has its limitations when it comes to 1) flexibility in terms of quality measures and constraints that can be used, and/or 2) guarantees with respect to sampling accuracy.

Evolving the Structure of Evolution Strategies

no code implementations17 Oct 2016 Sander van Rijn, Hao Wang, Matthijs van Leeuwen, Thomas Bäck

Various variants of the well known Covariance Matrix Adaptation Evolution Strategy (CMA-ES) have been proposed recently, which improve the empirical performance of the original algorithm by structural modifications.

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