Dear participants, The training and validation datasets are already available. You can start working for the challenge. Please, visit the website for more details: https://bnn.upc.edu/challenge/gnnet2021 <https://bnn.upc.edu/challenge/gnnet2021> Note that there are some resources that can be useful as a starting point, including some summary slides (with tips for participants), a baseline model (RouteNet), and an API to easily read and process the datasets. Please, do not hesitate to use this mailing list if you have any questions or comments. Thank you for your interest on behalf of the challenge organizing team. Good luck! Kind regards, José Suárez-Varela Barcelona Neural Networking center Universitat Politècnica de Catalunya