We are thrilled to announce that our paper, "Hypergraph-based Temporal Modelling of Repeated Intent for Sequential Recommendation," has been accepted for presentation at the prestigious ACM Web Conference (WWW) 2025, taking place in Sydney, Australia.

The paper introduces HyperHawkes, a novel model that leverages hypergraphs and Hawkes Processes to capture repeated user intent in sequential recommendation systems. By integrating long-term and short-term interest modeling, HyperHawkes significantly outperforms existing state-of-the-art methods across multiple real-world datasets.

Stay tuned for more details about the paper!

The report on the Dagstuhl seminar "Evaluation Perspectives of Recommender Systems: Driving Research and Education" is out. It describes the outcomes of our Dagstuhl seminar, which brought together 41 participants from 16 countries - co-organized by Christine Bauer, Alan Said, and Eva Zangerle.

We are happy to announce that an extended version of our recent work in session-based recommendation has been accepted for publication in the prestigious ACM Transactions on Recommender Systems (TORS). This extended paper builds on our initial research, incorporating deeper insights, expanded experiments, and additional analysis that further advance the underlying model. You can find the official announcement and details about the publication here.

Marta Moscati will present our short paper on "Emotion-Based Music Recommendation from Quality Annotations and Large-Scale User-Generated Tags" co-authored by Marta Moscati, Hannah Strauß, Peer-Ole Jacobsen, Andreas Peintner, Eva Zangerle, Marcel Zentner and Markus Schedl at the 32nd ACM Conference on User Modeling, Adaptation and Personalization next week.

Our paper "Song lyrics have become simpler and more repetitive over the last five decades" was published in Nature Scientific Reports. Our study was also widely reported in the media, for instance in Scientific American, Newsweek, Science, or Der Standard.

We are happy to announce that the Special Issue on Perspectives on Recommender Systems Evaluation (PRSE) co-edited by Eva Zangerle, Christine Bauer, and Alan Said, has just appeared in ACM Transactions on Recommender Systems. It contains ten highly interesting papers that all provide different perspectives on the evaluation of recommender systems - from evaluating the user perspectives, over novel evaluation methods and frameworks, testing recommender systems, to a survey on the current state of RecSys evaluation.

Our paper The Emotion-to-Music Mapping Atlas (EMMA): A systematically organized online database of emotionally evocative music excerpts has just been published in Behavior Research Methods. In this work, we present the Emotion-to-Music Mapping Atlas (EMMA). 364 music excerpts from pop, hip/hop and classical music were rated for felt emotion using the Geneva Emotion Music Scale (GEMS). The sample comprised 517 English- and German-speaking participants and each excerpt was rated by an average of 28.76 participants. This work is part of our ongoing FWF project Humans and Recommender Systems - Towards a Mutual Understanding. 

Team RecSys will have a busy week at the ACM Recommender Systems Conference 2023 in Singapore: on Monday, Amir (paper) and Andreas (paper) will present their works in the doctoral symposium. On Tuesday, Eva (together with Christine Bauer and Alan Said) will hold the third PERSPECTIVES workshop. On Friday, Andreas will present our paper "SPARE: Shortest Path Global Item Relations for Efficient Session-based Recommendation". Furthermore,  Eva and Christine Bauer will present "Evaluating Recommender Systems: Survey and Framework" (paper), published in ACM Computing Surveys, for which they received the Women in RecSys Journal Paper of the Year award (senior category). 

We are thrilled to announce that two Doctoral Symposium papers have been accepted for presentation at the prestigious RecSys 2023 Conference in Singapore during September 2023. One paper, authored by Andreas Peintner, plans to contribute significantly to advancing Graph-based Sequential Recommender Systems. The second accepted paper, authored by Amir Reza Mohammadi, promises to make valuable contributions to the development of Explainable Graph Neural Network Recommenders. These notable contributions hold the potential to shape the future of Recommender Systems.

We are very proud that our paper "SPARE: Shortest Path Global Item Relations for Efficient Session-based Recommendation" has just been accepted as a long paper at the ACM Conference on Recommender Systems (RecSys) 2023 in Singapore. In this paper, we propose to model the multi-hop information aggregation mechanism of GNNs over multiple layers via shortest-path edges based on knowledge from the sequential recommendation domain. Additionally, we apply supervised contrastive learning to address the inherent data sparsity.

Eva held a keynote at the Workshop on Machine Learning for Streaming Media at the Web Conference 2023 in Austin. The title of the talk was “What Can We Learn From Analyzing Streaming Music Data?”, detailing the potential of public streaming datasets, example case studies, but also caveats and limitations of using such datasets for research.

Our report on the 2nd Workshop on the Perspectives on the Evaluation of Recommender Systems (PERSPECTIVES 2022) at RecSys 2022 has been published in the December issue of SIGIR Forum.

Last week, Marta Moscati presented our paper "Music4All-Onion -- A Large-Scale Multi-Faceted Content-Centric Music Recommendation Dataset" at the 31st ACM International Conference on Information & Knowledge Management conference. The paper is available here and the dataset and code is publicly available here. This research is part of our FWF project "Humans and Recommender Systems - Towards a Mutual Understanding" (see https://humrec.github.io/ for further information).

This week, the 16th ACM Conference on Recommender Systems takes place and DBIS is part of it :)

• Eva received the "Women in RecSys: Journal Paper of the Year Awards" for her paper "Leveraging Affective Hashtags for Ranking Music Recommendations" (link), together with Yi-Hsuan Yang, Chih-Ming Chen, and Ming-Feng Tsai. Eva will present the paper in the Women in RecSys session on Wednesday.
• The 2nd Workshop: Perspectives on the Evaluation of Recommender Systems (co-organized by Eva) will take place on Thursday as a full-day workshop at RecSys.
• Andreas will present our paper "Unsupervised Graph Embeddings for Session-based Recommendation with Item Features" at CARS: Workshop on Context-Aware Recommender Systems on Friday.

We are very proud that our paper "Evaluating Recommender Systems: Survey and Framework" has just been accepted for publication at ACM Computing Surveys (impact factor 14.324). In this survey paper, Eva and Christine Bauer (Utrecht University) systematically review recommender system evaluation and introduce the “Framework for EValuating Recommender systems” (FEVR) that allows to categorize the evaluation space of recommender systems evaluation. The paper is already available via https://dl.acm.org/doi/10.1145/3556536.