1. Centre Borelli, Ecole Normale Superieure (ENS) Paris Saclay, 91190 Gif-sur-Yvette, France;
2. Criteo AI Lab, 75009 Paris, France;
3. Center for Research in Economics and Statistics (CREST), École Nationale de la Statistique et de l’Administration Économique (ENSAE), 91120 Palaiseau, France;
4. Department of Statistics, University of California, Berkeley, California 94720