polychord: next-generation nested sampling

polychord is a novel nested sampling algorithm tailored for high-dimensional parameter spaces. This paper coincides with the release of polychord v1.6, and provides an extensive account of the algorithm. polychord utilizes slice sampling at each iteration to sample within the hard likelihood constra...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society Vol. 453; no. 4; pp. 4384 - 4398
Main Authors: Handley, W. J., Hobson, M. P., Lasenby, A. N.
Format: Journal Article
Language:English
Published: London Oxford University Press 11.11.2015
Subjects:
Algorithms
Astronomy
Computation
Cosmology
Downloading
Evolution
Hierarchies
Parallel processing
Sampling
methods: statistical
methods: data analysis
ISSN:0035-8711, 1365-2966
Online Access:Get full text
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Summary:polychord is a novel nested sampling algorithm tailored for high-dimensional parameter spaces. This paper coincides with the release of polychord v1.6, and provides an extensive account of the algorithm. polychord utilizes slice sampling at each iteration to sample within the hard likelihood constraint of nested sampling. It can identify and evolve separate modes of a posterior semi-independently, and is parallelized using openmpi. It is capable of exploiting a hierarchy of parameter speeds such as those present in cosmomc and camb, and is now in use in the cosmochord and modechord codes. polychord is available for download from http://ccpforge.cse.rl.ac.uk/gf/project/polychord/.
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ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stv1911