Search Results for author: Stefan Neumann

Found 6 papers, 3 papers with code

Visualizing Overlapping Biclusterings and Boolean Matrix Factorizations

2 code implementations14 Jul 2023 Thibault Marette, Pauli Miettinen, Stefan Neumann

In this paper, we study the problem of visualizing \emph{a given clustering} of overlapping clusters in bipartite graphs and the related problem of visualizing Boolean Matrix Factorizations.

Adversaries with Limited Information in the Friedkin--Johnsen Model

1 code implementation17 Jun 2023 Sijing Tu, Stefan Neumann, Aristides Gionis

To address this concern, we raise the following question: Can an attacker sow discord in a social network, even when only the network topology is known?

Open-Ended Question Answering Sociology

Sublinear-Time Clustering Oracle for Signed Graphs

1 code implementation28 Jun 2022 Stefan Neumann, Pan Peng

We provide a local clustering oracle for signed graphs with such a clear community structure, that can answer membership queries, i. e., "Given a vertex $v$, which community does $v$ belong to?

Clustering

Biclustering and Boolean Matrix Factorization in Data Streams

no code implementations5 Dec 2020 Stefan Neumann, Pauli Miettinen

We provide an algorithm that, after one pass over the stream, recovers the set of clusters on the right side of the graph using sublinear space; to the best of our knowledge, this is the first algorithm with this property.

Clustering

Recent Developments in Boolean Matrix Factorization

no code implementations5 Dec 2020 Pauli Miettinen, Stefan Neumann

The goal of Boolean Matrix Factorization (BMF) is to approximate a given binary matrix as the product of two low-rank binary factor matrices, where the product of the factor matrices is computed under the Boolean algebra.

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