Proceedings of the 4th international workshop on Learning to Quantify (LQ 2024)

The 4th International Workshop on Learning to Quantify (LQ 2024 – https://lq-2024.github.io/) was held in Vilnius, LT, on September 13, 2024, as a satellite workshop of the European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECML/PKDD 2024). While the 1st edition of the workshop (LQ 2021 – https://cikmlq2021.github.io/) had to be an entirely online event, LQ 2024 (like the 2nd edition LQ 2022 – https://lq-2022.github.io/ and 3rd edition LQ 2023 – https://lq-2023.github.io/) was a hybrid event, with presentations given in-presence, and both in-presence attendees and remote attendees. The workshop was the second part (Sep 13 afternoon) of a full-day event, whose first part (Sep 13 morning) consisted of a tutorial on Learning to Quantify presented by Mirko Bunse and Alejandro Moreo. The LQ 2024 workshop consisted of the presentations of three contributed papers, plus a number of invited contributions about the LeQua 2024 challenge, i.e., an overview of the challenge presented by the organisers, plus five brief presentations by LeQua 2024 participants. The program ended with a final collective discussion on LeQua 2024, on the open problems of learning to quantify, and on future initiatives. The present volume contains the text of these nine contributions. We hope that the availability of the present volume will increase the interest in the subject of quantification on the part of researchers and practitioners alike, and will contribute to making quantification better known to potential users of this technology and to researchers interested in advancing the field.