Online learning of Riemannian hidden Markov models in homogeneous Hadamard spaces

02/15/2021

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by   Quinten Tupker, et al.

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Hidden Markov models with observations in a Euclidean space play an important role in signal and image processing. Previous work extending to models where observations lie in Riemannian manifolds based on the Baum-Welch algorithm suffered from high memory usage and slow speed. Here we present an algorithm that is online, more accurate, and offers dramatic improvements in speed and efficiency.