Domain-aware priors stabilize, not merely enable, vertical federated learning in data-scarce coral multi-omics
This paper demonstrates that incorporating domain-aware priors, specifically gradient saliency-guided feature selection with biological constraints, significantly stabilizes vertical federated learning for coral multi-omics classification under extreme data scarcity (P >> N), enabling the REEF framework to substantially outperform generic and state-of-the-art baselines while reducing variance and ensuring interpretability.