Karl Aberer

Co-Founder of LinkAlong Sarl, 2017.Vice-president EPFL for Information Systems, 2012 –2016.Director of the Swiss National Centre for Mobile Information and Communication Systems NCCR MICS (mics.ch), 2005 -2012.Member of the Swiss Research and Technology Council SWTR, consulting the Swiss Federal government, 2004 - 2011.

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CS-423: Distributed information systems

This course introduces the key concepts and algorithms from the areas of information retrieval, data mining and knowledge bases, which constitute the foundations of today's Web-based distributed information systems.

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Une donnée est ce qui est connu et qui sert de point de départ à un raisonnement ayant pour objet la détermination d'une solution à un problème en relation avec cette donnée. Cela peut être une descr

Pair-à-pair

Le pair-à-pair ou système pair à pair (en anglais peer-to-peer, souvent abrégé « P2P ») est un modèle d'échange en réseau où chaque entité est à la fois client et serveur, contrairement au modèle c

Réseau de capteurs sans fil

Un réseau de capteurs sans fil est un réseau ad hoc d'un grand nombre de nœuds, qui sont des micro-capteurs capables de recueillir et de transmettre des données d'une manière autonome. La position de

From scattered sources to comprehensive technology landscape : A recommendation-based retrieval approach

Karl Aberer, Chi Thang Duong

Mapping the technology landscape is crucial for market actors to take informed investment decisions. However, given the large amount of data on the Web and its subsequent information overload, manually retrieving information is a seemingly ineffective and incomplete approach. In this work, we propose an end-to-end recommendation based retrieval approach to support automatic retrieval of technologies and their associated companies from raw Web data. This is a two-task setup involving (i) technology classification of entities extracted from company corpus, and (ii) technology and company retrieval based on classified technologies. Our proposed framework approaches the first task by leveraging DistilBERT which is a state-of-the-art language model. For the retrieval task, we introduce a recommendation-based retrieval technique to simultaneously support retrieving related companies, technologies related to a specific company and companies relevant to a technology. To evaluate these tasks, we also construct a data set that includes company documents and entities extracted from these documents together with company categories and technology labels. Experiments show that our approach is able to return 4 times more relevant companies while outperforming traditional retrieval baseline in retrieving technologies.

ELSEVIER2023

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Efficient and Effective Multi-Modal Queries Through Heterogeneous Network Embedding

Karl Aberer, Chi Thang Duong, Quoc Viet Hung Nguyen, Thành Tâm Nguyên

The heterogeneity of today's Web sources requires information retrieval (IR) systems to handle multi-modal queries. Such queries define a user's information needs by different data modalities, such as keywords, hashtags, user profiles, and other media. Recent IR systems answer such a multi-modal query by considering it as a set of separate uni-modal queries. However, depending on the chosen operationalisation, such an approach is inefficient or ineffective. It either requires multiple passes over the data or leads to inaccuracies since the relations between data modalities are neglected in the relevance assessment. To mitigate these challenges, we present an IR system that has been designed to answer genuine multi-modal queries. It relies on a heterogeneous network embedding, so that features from diverse modalities can be incorporated when representing both, a query and the data over which it shall be evaluated. By embedding a query and the data in the same vector space, the relations across modalities are made explicit and exploited for more accurate query evaluation. At the same time, multi-modal queries are answered with a single pass over the data. An experimental evaluation using diverse real-world and synthetic datasets illustrates that our approach returns twice the amount of relevant information compared to baseline techniques, while scaling to large multi-modal databases.

IEEE COMPUTER SOC2022

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Nature vs. Nurture: Feature vs. Structure for Graph Neural Networks

Karl Aberer, Chi Thang Duong, Thành Tâm Nguyên

Graph neural networks take node features and graph structure as input to build representations for nodes and graphs. While there are a lot of focus on GNN models, understanding the impact of node features and graph structure to GNN performance has received less attention. In this paper, we propose an explanation for the connection between features and structure: graphs can be constructed by connecting node features according to a latent function. While this hypothesis seems trivial, it has several important implications. First, it allows us to define graph families which we use to explain the transferability of GNN models. Second, it enables application of GNNs for featureless graphs by reconstructing node features from graph structure. Third, it predicts the existence of a latent function which can create graphs that when used with original features in a GNN outperform original graphs for a specific task. We propose a graph generative model to learn such function. Finally, our experiments confirm the hypothesis and these implications. (C) 2022 Elsevier B.V. All rights reserved.

ELSEVIER2022

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