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Matias Altamirano

5 accepted papers

2025

Robust and Conjugate Spatio-Temporal Gaussian Processes

ICML 2025poster

State-space formulations allow for Gaussian process (GP) regression with linear-in-time computational cost in spatio-temporal settings, but performance typically suffers in the presence of outliers. In this paper, we adapt and specialise the *robust and conjugate GP (RCGP)* framework of Altamirano e…

2024

Outlier-robust Kalman Filtering through Generalised Bayes

ICML 2024poster

We derive a novel, provably robust, efficient, and closed-form Bayesian update rule for online filtering in state-space models in the presence of outliers and misspecified measurement models. Our method combines generalised Bayesian inference with filtering methods such as the extended and ensemble…

2024

Robust and Conjugate Gaussian Process Regression

ICML 2024spotlight

To enable closed form conditioning, a common assumption in Gaussian process (GP) regression is independent and identically distributed Gaussian observation noise. This strong and simplistic assumption is often violated in practice, which leads to unreliable inferences and uncertainty quantification.…

2023

Robust and Scalable Bayesian Online Changepoint Detection

ICML 2023poster

This paper proposes an online, provably robust, and scalable Bayesian approach for changepoint detection. The resulting algorithm has key advantages over previous work: it provides provable robustness by leveraging the generalised Bayesian perspective, and also addresses the scalability issues of pr…

2022

Nonstationary multi-output Gaussian processes via harmonizable spectral mixtures

AISTATS 2022poster

Kernel design for Multi-output Gaussian Processes (MOGP) has received increased attention recently, in particular, the Multi-Output Spectral Mixture kernel (MOSM) approach has been praised as a general model in the sense that it extends other approaches such as Linear Model of Corregionalization, In…