Search Results for author: Jefrey Lijffijt

Found 23 papers, 13 papers with code

New Perspectives on the Evaluation of Link Prediction Algorithms for Dynamic Graphs

1 code implementation30 Nov 2023 Raphaël Romero, Tijl De Bie, Jefrey Lijffijt

We leverage these visualization tools to investigate the effect of negative sampling on the predictive performance, at the node and edge level.

Dynamic Link Prediction

FEIR: Quantifying and Reducing Envy and Inferiority for Fair Recommendation of Limited Resources

1 code implementation8 Nov 2023 Nan Li, Bo Kang, Jefrey Lijffijt, Tijl De Bie

In settings such as e-recruitment and online dating, recommendation involves distributing limited opportunities, calling for novel approaches to quantify and enforce fairness.

Fairness Recommendation Systems

ReCon: Reducing Congestion in Job Recommendation using Optimal Transport

1 code implementation18 Aug 2023 Yoosof Mashayekhi, Bo Kang, Jefrey Lijffijt, Tijl De Bie

Recommenders are increasingly used in domains where items have limited availability, such as the job market, where congestion is especially problematic: Recommending a vacancy -- for which typically only one person will be hired -- to a large number of job seekers may lead to frustration for job seekers, as they may be applying for jobs where they are not hired.

Recommendation Systems

Revised Conditional t-SNE: Looking Beyond the Nearest Neighbors

1 code implementation7 Feb 2023 Edith Heiter, Bo Kang, Ruth Seurinck, Jefrey Lijffijt

Conditional t-SNE (ct-SNE) is a recent extension to t-SNE that allows removal of known cluster information from the embedding, to obtain a visualization revealing structure beyond label information.

Topologically Regularized Data Embeddings

1 code implementation9 Jan 2023 Edith Heiter, Robin Vandaele, Tijl De Bie, Yvan Saeys, Jefrey Lijffijt

In some cases, users may have prior topological knowledge about the data, such as a known cluster structure or the fact that the data is known to lie along a tree- or graph-structured topology.

Computational Efficiency Dimensionality Reduction +2

A Systematic Evaluation of Node Embedding Robustness

1 code implementation16 Sep 2022 Alexandru Mara, Jefrey Lijffijt, Stephan Günnemann, Tijl De Bie

We find that node classification results are impacted more than network reconstruction ones, that degree-based and label-based attacks are on average the most damaging and that label heterophily can strongly influence attack performance.

Classification Node Classification

A challenge-based survey of e-recruitment recommendation systems

no code implementations12 Sep 2022 Yoosof Mashayekhi, Nan Li, Bo Kang, Jefrey Lijffijt, Tijl De Bie

The recommendations are generated based on the suitability of the job seekers for the positions as well as the job seekers' and the recruiters' preferences.

Collaborative Filtering Recommendation Systems

ExClus: Explainable Clustering on Low-dimensional Data Representations

no code implementations4 Nov 2021 Xander Vankwikelberge, Bo Kang, Edith Heiter, Jefrey Lijffijt

Dimensionality reduction and clustering techniques are frequently used to analyze complex data sets, but their results are often not easy to interpret.

Clustering Dimensionality Reduction

Topologically Regularized Data Embeddings

1 code implementation ICLR 2022 Robin Vandaele, Bo Kang, Jefrey Lijffijt, Tijl De Bie, Yvan Saeys

For tasks for which prior expert topological knowledge is available, incorporating this into the learned representation may lead to higher quality embeddings.

Graph Embedding Representation Learning

Adversarial Robustness of Probabilistic Network Embedding for Link Prediction

no code implementations5 Jul 2021 Xi Chen, Bo Kang, Jefrey Lijffijt, Tijl De Bie

However, these methods lack transparency when compared to simpler baselines, and as a result their robustness against adversarial attacks is a possible point of concern: could one or a few small adversarial modifications to the network have a large impact on the link prediction performance when using a network embedding model?

Adversarial Robustness Link Prediction +1

CSNE: Conditional Signed Network Embedding

2 code implementations19 May 2020 Alexandru Mara, Yoosof Mashayekhi, Jefrey Lijffijt, Tijl De Bie

Experiments on a variety of real-world networks confirm that CSNE outperforms the state-of-the-art on the task of sign prediction.

Network Embedding

Benchmarking Network Embedding Models for Link Prediction: Are We Making Progress?

2 code implementations25 Feb 2020 Alexandru Mara, Jefrey Lijffijt, Tijl De Bie

Network embedding methods map a network's nodes to vectors in an embedding space, in such a way that these representations are useful for estimating some notion of similarity or proximity between pairs of nodes in the network.

Benchmarking Link Prediction +1

Block-Approximated Exponential Random Graphs

1 code implementation14 Feb 2020 Florian Adriaens, Alexandru Mara, Jefrey Lijffijt, Tijl De Bie

An important challenge in the field of exponential random graphs (ERGs) is the fitting of non-trivial ERGs on large graphs.

Clustering Link Prediction

ALPINE: Active Link Prediction using Network Embedding

no code implementations4 Feb 2020 Xi Chen, Bo Kang, Jefrey Lijffijt, Tijl De Bie

Often, the link status of a node pair can be queried, which can be used as additional information by the link prediction algorithm.

Active Learning Experimental Design +2

Conditional t-SNE: Complementary t-SNE embeddings through factoring out prior information

no code implementations24 May 2019 Bo Kang, Darío García García, Jefrey Lijffijt, Raúl Santos-Rodríguez, Tijl De Bie

Dimensionality reduction and manifold learning methods such as t-Distributed Stochastic Neighbor Embedding (t-SNE) are routinely used to map high-dimensional data into a 2-dimensional space to visualize and explore the data.

Dimensionality Reduction

ExplaiNE: An Approach for Explaining Network Embedding-based Link Predictions

no code implementations22 Apr 2019 Bo Kang, Jefrey Lijffijt, Tijl De Bie

Networks are powerful data structures, but are challenging to work with for conventional machine learning methods.

BIG-bench Machine Learning counterfactual +2

EvalNE: A Framework for Evaluating Network Embeddings on Link Prediction

1 code implementation22 Jan 2019 Alexandru Mara, Jefrey Lijffijt, Tijl De Bie

In this paper we present EvalNE, a Python toolbox for evaluating network embedding methods on link prediction tasks.

Social and Information Networks

Conditional Network Embeddings

no code implementations ICLR 2019 Bo Kang, Jefrey Lijffijt, Tijl De Bie

Network Embeddings (NEs) map the nodes of a given network into $d$-dimensional Euclidean space $\mathbb{R}^d$.

General Classification Link Prediction +1

Interactive Visual Data Exploration with Subjective Feedback: An Information-Theoretic Approach

1 code implementation23 Oct 2017 Kai Puolamäki, Emilia Oikarinen, Bo Kang, Jefrey Lijffijt, Tijl De Bie

We conclude that the information theoretic approach to exploratory data analysis where patterns observed by a user are formalized as constraints provides a principled, intuitive, and efficient basis for constructing an EDA system.

Informative Data Projections: A Framework and Two Examples

no code implementations27 Nov 2015 Tijl De Bie, Jefrey Lijffijt, Raul Santos-Rodriguez, Bo Kang

Methods for Projection Pursuit aim to facilitate the visual exploration of high-dimensional data by identifying interesting low-dimensional projections.

Vocal Bursts Valence Prediction

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