Challenges are proposed by public services, companies or scientific laboratories, and are based on real-life problems. Participants submit the results of their classification or prediction algorithms, which are then put into competition via the website. The challenges are integrated into Pr Stéphane Mallat's course at the Collège de France, and are offered as part of many data science courses in France and the French-speaking world.
The 2022 edition has now been launched with twelve new challenges, organized in partnership with the École normale supérieure and the Institut Louis Bachelier.