no code implementations • 9 Nov 2023 • Justin Alsing, Thomas D. P. Edwards, Benjamin Wandelt
We present a framework for the efficient computation of optimal Bayesian decisions under intractable likelihoods, by learning a surrogate model for the expected utility (or its distribution) as a function of the action and data spaces.
no code implementations • 5 Oct 2023 • T. Lucas Makinen, Justin Alsing, Benjamin D. Wandelt
Set-based learning is an essential component of modern deep learning and network science.
1 code implementation • 25 May 2022 • Harry T. J. Bevins, William J. Handley, Pablo Lemos, Peter H. Sims, Eloy de Lera Acedo, Anastasia Fialkov, Justin Alsing
Bayesian analysis has become an indispensable tool across many different cosmological fields including the study of gravitational waves, the Cosmic Microwave Background and the 21-cm signal from the Cosmic Dawn among other phenomena.
1 code implementation • 24 Feb 2021 • Justin Alsing, Will Handley
In this letter we show that parametric bijectors trained on samples from a desired prior density provide a general-purpose method for constructing transformations from the uniform base density to a target prior, enabling the practical use of nested sampling under arbitrary priors.
3 code implementations • 17 Sep 2020 • Niall Jeffrey, Justin Alsing, Francois Lanusse
We present likelihood-free cosmological parameter inference using weak lensing maps from the Dark Energy Survey (DES) SV data, using neural data compression of weak lensing map summary statistics.
Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics
1 code implementation • 26 Nov 2019 • Justin Alsing, Hiranya Peiris, Joel Leja, ChangHoon Hahn, Rita Tojeiro, Daniel Mortlock, Boris Leistedt, Benjamin D. Johnson, Charlie Conroy
We present \textsc{speculator} -- a fast, accurate, and flexible framework for emulating stellar population synthesis (SPS) models for predicting galaxy spectra and photometry.
Instrumentation and Methods for Astrophysics Astrophysics of Galaxies
2 code implementations • 4 Mar 2019 • Justin Alsing, Benjamin Wandelt
This means that the nuisance marginalized inference task involves learning $n$ interesting parameters from $n$ "nuisance hardened" data summaries, regardless of the presence or number of additional nuisance parameters to be marginalized over.
Cosmology and Nongalactic Astrophysics
7 code implementations • 28 Feb 2019 • Justin Alsing, Tom Charnock, Stephen Feeney, Benjamin Wandelt
Likelihood-free inference provides a framework for performing rigorous Bayesian inference using only forward simulations, properly accounting for all physical and observational effects that can be successfully included in the simulations.
Cosmology and Nongalactic Astrophysics
1 code implementation • 9 Feb 2018 • Stephen M. Feeney, Hiranya V. Peiris, Andrew R. Williamson, Samaya M. Nissanke, Daniel J. Mortlock, Justin Alsing, Dan Scolnic
The Hubble constant ($H_0$) estimated from the local Cepheid-supernova (SN) distance ladder is in 3-$\sigma$ tension with the value extrapolated from cosmic microwave background (CMB) data assuming the standard cosmological model.
Cosmology and Nongalactic Astrophysics
1 code implementation • 4 Jan 2018 • Justin Alsing, Benjamin Wandelt, Stephen Feeney
Secondly, we present the first cosmological application of Density Estimation Likelihood-Free Inference (\textsc{delfi}), which learns a parameterized model for joint distribution of data and parameters, yielding both the parameter posterior and the model evidence.
Cosmology and Nongalactic Astrophysics