Search Results for author: Alexandru Mara

Found 10 papers, 6 papers with code

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

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

Semi-supervised Learning in Network-Structured Data via Total Variation Minimization

no code implementations28 Jan 2019 Alexander Jung, Alfred O. Hero III, Alexandru Mara, Saeed Jahromi, Ayelet Heimowitz, Yonina C. Eldar

This lends naturally to learning the labels by total variation (TV) minimization, which we solve by applying a recently proposed primal-dual method for non-smooth convex optimization.

Clustering

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

Recovery Conditions and Sampling Strategies for Network Lasso

no code implementations3 Sep 2017 Alexandru Mara, Alexander Jung

By generalizing the concept of the compatibility condition put forward by van de Geer and Buehlmann as a powerful tool for the analysis of plain Lasso, we derive a sufficient condition, i. e., the network compatibility condition, on the underlying network topology such that network Lasso accurately learns a clustered underlying graph signal.

BIG-bench Machine Learning Clustering

When is Network Lasso Accurate?

no code implementations7 Apr 2017 Alexander Jung, Nguyen Tran Quang, Alexandru Mara

By leveraging concepts of compressed sensing, we address this gap and derive precise conditions on the underlying network topology and sampling set which guarantee the network Lasso for a particular loss function to deliver an accurate estimate of the entire underlying graph signal.

Semi-Supervised Learning via Sparse Label Propagation

1 code implementation5 Dec 2016 Alexander Jung, Alfred O. Hero III, Alexandru Mara, Saeed Jahromi

This learning algorithm allows for a highly scalable implementation as message passing over the underlying data graph.

Scalable Semi-Supervised Learning over Networks using Nonsmooth Convex Optimization

no code implementations2 Nov 2016 Alexander Jung, Alfred O. Hero III, Alexandru Mara, Sabeur Aridhi

We propose a scalable method for semi-supervised (transductive) learning from massive network-structured datasets.

Transductive Learning

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