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Multimodal Bayesian registration of noisy functions using Hamiltonian Monte Carlo

Journal Article · · Computational Statistics and Data Analysis (Print)
Functional data registration is a necessary processing step for many applications. The observed data can be inherently noisy, often due to measurement error or natural process uncertainty; which most functional alignment methods cannot handle. A pair of functions can also have multiple optimal alignment solutions, which is not addressed in current literature. In this paper, a flexible Bayesian approach to functional alignment is presented, which appropriately accounts for noise in the data without any pre-smoothing required. Additionally, by running parallel MCMC chains, the method can account for multiple optimal alignments via the multi-modal posterior distribution of the warping functions. To most efficiently sample the warping functions, the approach relies on a modification of the standard Hamiltonian Monte Carlo to be well-defined on the infinite-dimensional Hilbert space. In this work, this flexible Bayesian alignment method is applied to both simulated data and real data sets to show its efficiency in handling noisy functions and successfully accounting for multiple optimal alignments in the posterior; characterizing the uncertainty surrounding the warping functions.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1798142
Alternate ID(s):
OSTI ID: 1788094
Report Number(s):
SAND--2021-6871J; 696769
Journal Information:
Computational Statistics and Data Analysis (Print), Journal Name: Computational Statistics and Data Analysis (Print) Vol. 163; ISSN 0167-9473
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (24)

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Bayesian Framework for Simultaneous Registration and Estimation of Noisy, Sparse and Fragmented Functional Data dataset January 2021

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