Poster
Score matching for bridges without learning time-reversals
Simon Olsson · Gefan Yang
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Abstract
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Abstract:
We propose a new algorithm for learning a bridged diffusion process using score-matching methods. Our method relies on reversing the dynamics of the forward process and using this to learn a score function, which, via Doob's h-transform, gives us a bridged diffusion process; that is, a process conditioned on an endpoint. In contrast to prior methods, ours learns the score term ∇xlogp(t,x;T,y), for given t,y directly, completely avoiding the need for first learning a time-reversal. We compare the performance of our algorithm with existing methods and see that it outperforms using the (learned) time-reversals to learn the score term. The code can be found at https://github.com/libbylbaker/forward_bridge.
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