- Advanced Graph Neural Networks
- Topic Modeling
- Semantic Web and Ontologies
- Complex Network Analysis Techniques
- Data Quality and Management
- EEG and Brain-Computer Interfaces
- Natural Language Processing Techniques
- Functional Brain Connectivity Studies
- Mental Health Research Topics
- Genomics and Phylogenetic Studies
- Power Systems and Technologies
- Graph Theory and Algorithms
- Multimedia Communication and Technology
- Privacy-Preserving Technologies in Data
- Bioinformatics and Genomic Networks
- Multimodal Machine Learning Applications
- RNA and protein synthesis mechanisms
- Text and Document Classification Technologies
- Machine Learning in Bioinformatics
- Bayesian Modeling and Causal Inference
- Advanced Image and Video Retrieval Techniques
- Neonatal and fetal brain pathology
- 3D Modeling in Geospatial Applications
- Access Control and Trust
- Machine Learning in Materials Science
Vrije Universiteit Amsterdam
2016-2024
University of Amsterdam
2014-2022
Knowledge Foundation
2018
Knowledge graphs enable a wide variety of applications, including question answering and information retrieval. Despite the great effort invested in their creation maintenance, even largest (e.g., Yago, DBPedia or Wikidata) remain incomplete. We introduce Relational Graph Convolutional Networks (R-GCNs) apply them to two standard knowledge base completion tasks: Link prediction (recovery missing facts, i.e. subject-predicate-object triples) entity classification attributes). R-GCNs are...
In modern machine learning, raw data is the preferred input for our models.Where a decade ago scientists were still engineering features, manually picking out details we thought salient, they now prefer in their form.As long as can assume that all relevant and irrelevant information present data, design deep models build up intermediate representations to sift features.However, these are often domain specific tailored task at hand, therefore unsuited learning on heterogeneous knowledge: of...
In this article, we describe a reproduction of the Relational Graph Convolutional Network (RGCN). Using our reproduction, explain intuition behind model. Our results empirically validate correctness implementations using benchmark Knowledge datasets on node classification and link prediction tasks. explanation provides friendly understanding different components RGCN for both users researchers extending approach. Furthermore, introduce two new configurations that are more parameter...
Self-supervised language modeling is a rapidly developing approach for the analysis of protein sequence data. However, work in this area heterogeneous and diverse, making comparison models methods difficult. Moreover, are often evaluated only on one or two downstream tasks, it unclear whether capture generally useful properties. We introduce ProteinGLUE benchmark evaluation representations: set seven per-amino-acid tasks evaluating learned representations. also offer reference code, we...
Differentially private learning on real-world data poses challenges for standard machine practice: privacy guarantees are difficult to interpret, hyperparameter tuning reduces the budget, and ad-hoc attacks often required test model privacy. We introduce three tools make differentially more practical: (1) simple sanity checks which can be carried out in a centralized manner before training, (2) an adaptive clipping bound reduce effective number of tuneable parameters, (3) we show that...
End-to-end multimodal learning on knowledge graphs has been left largely unaddressed. Instead, most end-to-end models such as message passing networks learn solely from the relational information encoded in graphs' structure: raw values, or literals, are either omitted completely stripped their values and treated regular nodes. In case we lose potentially relevant which could have otherwise exploited by our methods. To avoid this, must treat literals non-literals separate cases. We also...
Knowledge graphs enable data scientists to learn end-to-end on heterogeneous knowledge. However, most models solely from the relational information encoded in graphs' structure: raw values, as literal nodes, are either omitted completely or treated regular nodes without consideration for their values. In case we lose potentially relevant which could have otherwise been exploited by our learning methods. We propose a multimodal message passing network not only learns structure of graphs, but...
Large knowledge graphs capture information of a large number entities and their relations. Among the many relations they capture, class subsumption assertions are usually present expressed using \texttt{rdfs:subClassOf} construct. From our examination, publicly available contain potentially erroneous cyclic subclass relations, problem that can be exacerbated when different integrated as Linked Open Data. In this paper, we an automatic approach for resolving such cycles at scale automated...
Machine learning techniques such as deep have been increasingly used to assist EEG annotation, by automating artifact recognition, sleep staging, and seizure detection. In lack of automation, the annotation process is prone bias, even for trained annotators. On other hand, completely automated processes do not offer users opportunity inspect models’ output re-evaluate potential false predictions. As a first step toward addressing these challenges, we developed Robin’s Viewer (RV),...
The development of validated algorithms for automated handling artifacts is essential reliable and fast processing EEG signals. Recently, there have been methodological advances in designing machine-learning to improve artifact detection trained professionals who usually meticulously inspect manually annotate However, validation these methods hindered by the lack a gold standard as data are mostly private annotation time consuming error prone. In effort circumvent issues, we propose an...
In recent years, there has been remarkable progress in supervised image segmentation. Video segmentation is less explored, despite the temporal dimension being highly informative. Semantic labels, e.g. that cannot be accurately detected current frame, may inferred by incorporating information from previous frames. However, video challenging due to amount of data needs processed and, more importantly, cost involved obtaining ground truth annotations for each frame. this paper, we tackle issue...
Abstract We introduce a new method for finding network motifs . Subgraphs are when their frequency in the data is high compared to expected under null model To compute this expectation, full or approximate count of occurrences motif normally repeated on as many 1000 random graphs sampled from model; prohibitively expensive step. use ideas minimum description length literature define measure relevance. With our method, samples not required. Instead we probability and compare specially...
This document provides a tutorial description of the use MDL principle in complex graph analysis. We give brief summary preliminary subjects, and describe basic principle, using example analysing size largest clique graph. also provide discussion how to interpret results such an analysis, making note several common pitfalls.
In this paper, we evaluate the accuracy of deep learning approaches on geospatial vector geometry classification tasks. The purpose evaluation is to investigate ability models learn from coordinates directly. Previous machine research applied polygon data did not use geometries directly, but derived properties thereof. These are produced by way extracting such as Fourier descriptors. Instead, our introduced neural net architectures able sequences mapped directly polygons. three tasks show...