Solution for Kaggle Santa competition https://www.kaggle.com/c/santa-workshop-tour-2019/overview
Background and explanation for the model can be found at https://www.kaggle.com/c/santa-workshop-tour-2019/discussion/126254
This is joint work with Alain Chabrier and Stéphane Michel.
The two notebooks implement a very similar model, but one of them has symmetry breaking constraints.