@article{hgrpopermutationinvariantreinforcementle,
  title = {H-GRPO: Permutation-Invariant Reinforcement Learning for Grounded Visual Reasoning},
  author = {Eric Peh and Debaditya Roy and Basura Fernando},
  year = {2026},
  eprint = {2606.29915},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.29915},
}