Search Results for author: Adam M. Johansen

Found 7 papers, 3 papers with code

Error bounds for particle gradient descent, and extensions of the log-Sobolev and Talagrand inequalities

no code implementations4 Mar 2024 Rocco Caprio, Juan Kuntz, Samuel Power, Adam M. Johansen

We prove non-asymptotic error bounds for particle gradient descent (PGD)~(Kuntz et al., 2023), a recently introduced algorithm for maximum likelihood estimation of large latent variable models obtained by discretizing a gradient flow of the free energy.

Momentum Particle Maximum Likelihood

no code implementations12 Dec 2023 Jen Ning Lim, Juan Kuntz, Samuel Power, Adam M. Johansen

Maximum likelihood estimation (MLE) of latent variable models is often recast as an optimization problem over the extended space of parameters and probability distributions.

Particle algorithms for maximum likelihood training of latent variable models

1 code implementation27 Apr 2022 Juan Kuntz, Jen Ning Lim, Adam M. Johansen

(Neal and Hinton, 1998) recast maximum likelihood estimation of any given latent variable model as the minimization of a free energy functional $F$, and the EM algorithm as coordinate descent applied to $F$.

Divide-and-Conquer Fusion

2 code implementations14 Oct 2021 Ryan S. Y. Chan, Murray Pollock, Adam M. Johansen, Gareth O. Roberts

Many existing approaches resort to approximating the individual sub-posteriors for practical necessity, then find either an analytical approximation or sample approximation of the resulting (product-pooled) posterior.

Generalized Bayesian Filtering via Sequential Monte Carlo

no code implementations23 Feb 2020 Ayman Boustati, Ömer Deniz Akyildiz, Theodoros Damoulas, Adam M. Johansen

We introduce a framework for inference in general state-space hidden Markov models (HMMs) under likelihood misspecification.

Bayesian Inference Object Tracking

Bayesian model comparison with un-normalised likelihoods

no code implementations1 Apr 2015 Richard G. Everitt, Adam M. Johansen, Ellen Rowing, Melina Evdemon-Hogan

Models for which the likelihood function can be evaluated only up to a parameter-dependent unknown normalising constant, such as Markov random field models, are used widely in computer science, statistical physics, spatial statistics, and network analysis.

Divide-and-Conquer with Sequential Monte Carlo

3 code implementations19 Jun 2014 Fredrik Lindsten, Adam M. Johansen, Christian A. Naesseth, Bonnie Kirkpatrick, Thomas B. Schön, John Aston, Alexandre Bouchard-Côté

We propose a novel class of Sequential Monte Carlo (SMC) algorithms, appropriate for inference in probabilistic graphical models.

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