@article{multilevelobjectivefunctionfree,
  title = {Multilevel Objective-Function-Free Optimization with an Application to Neural Networks Training},
  author = {S. Gratton and A. Kopanicakova and Ph. L. Toint},
  year = {2023},
  eprint = {2302.07049},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2302.07049v1},
}