1 code implementation • 30 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.
1 code implementation • 8 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.
1 code implementation • 18 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.
1 code implementation • 7 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.
1 code implementation • 9 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.
1 code implementation • 16 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.
no code implementations • 12 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.
no code implementations • 4 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.
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.
no code implementations • 5 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?
2 code implementations • 19 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.
2 code implementations • 25 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.
no code implementations • 24 Feb 2020 • Ahmad Mel, Bo Kang, Jefrey Lijffijt, Tijl De Bie
Real-world data often presents itself in the form of a network.
1 code implementation • 14 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.
no code implementations • 4 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.
1 code implementation • 10 Jan 2020 • Junning Deng, Bo Kang, Jefrey Lijffijt, Tijl De Bie
The connectivity structure of graphs is typically related to the attributes of the nodes.
no code implementations • 24 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.
no code implementations • 22 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.
1 code implementation • 22 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
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 $\mathbb{R}^d$.
1 code implementation • 23 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.
no code implementations • 12 Oct 2017 • Jefrey Lijffijt, Bo Kang, Wouter Duivesteijn, Kai Puolamäki, Emilia Oikarinen, Tijl De Bie
The subgroup descriptions are in terms of a succinct set of arbitrarily-typed other attributes.
no code implementations • 27 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.