Survival regression with proper scoring rules and monotonic neural networks

Conference item

We consider frequently used scoring rules for right-censored survival regression models such as time-dependent concordance, survival-CRPS, integrated Brier score and integrated binomial log-likelihood, and prove that neither of them is a proper scoring rule. This means that the true survival distribution may be scored worse than incorrect distributions, leading to inaccurate estimation. We prove, in contrast to these scores, that the right-censored log-likelihood is a proper scoring rule, i.e. the highest expected score is achieved by the true distribution. Despite this, modern feed-forward neural-network-based survival regression models are unable to train and validate directly on right-censored log-likelihood, due to its intractability, and resort to the aforementioned alternatives, i.e. non-proper scoring rules. We therefore propose a simple novel survival regression method capable of directly optimizing log-likelihood using a monotonic restriction on the time-dependent weights, coined SurvivalMonotonic-net (SuMo-net). SuMo-net achieves state-of-the-art log-likelihood scores across several datasets with 20–100x computational speedup on inference over existing state-of-the-art neural methods and is readily applicable to datasets with several million observations.

Authors: Rindt, D; Hu, R; Steinsaltz, D; Sejdinovic, D

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Journal of Machine Learning Research
• Pages: 1190-1205
• Series: Proceedings of Machine Learning Research
• Series number: 151
• Publication date: 2022-05-03
• Acceptance date: 2022-01-18
• Event title: 25th International Conference on Artificial Intelligence and Statistics (AISTATS 2022)
• Event location: Virtual event
• Event website: http://aistats.org/aistats2022/
• Event start date: 2022-03-28
• Event end date: 2022-03-30
• ISSN: 2640-3498
• Language: English
• Keywords: FFR