Thibaut Vidal

Optimal counterfactual explanations for k-Nearest Neighbors using Mathematical Optimization and Constraint Programming

  • Thibaut Vidal
  • Ricardo Fukasawa
  • Louis-Martin Rousseau
  • Claudio Contardo
    • Categories Applications - Science and Engineering, Data Science Algorithms Tags , , , ,

    Within the topic of explainable AI, counterfactual explanations to classifiers have received significant recent attention. We study counterfactual explanations that try to explain why a data point received an undesirable classification by providing the closest data point that would have received a desirable one. Within the context of one the simplest and most popular classification … Read more

    Adaptive Partitioning for Chance-Constrained Problems with Finite Support

  • Marius Roland
  • Alexandre Forel
  • Thibaut Vidal
    • Categories Integer Programming, Stochastic Programming

    This paper studies chance-constrained stochastic optimization problems with finite support. It presents an iterative method that solves reduced-size chance-constrained models obtained by partitioning the scenario set. Each reduced problem is constructed to yield a bound on the optimal value of the original problem. We show how to adapt the partitioning of the scenario set so … Read more

    New Benchmark Instances for the Capacitated Vehicle Routing Problem

  • Diego Pecin
  • Artur Alves Pessoa
  • Marcus Poggi de Aragão
  • Anand Subramanian
  • Eduardo Uchoa
  • Thibaut Vidal
    • Categories (Mixed) Integer Linear Programming, Meta Heuristics, Transportation Tags , ,

    The recent research on the CVRP is being slowed down by the lack of a good set of benchmark instances. The existing sets suff er from at least one of the following drawbacks: (i) became too easy for current algorithms; (ii) are too arti cial; (iii) are too homogeneous, not covering the wide range of characteristics found … Read more