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DTSTART:19960101T000000 END:STANDARD BEGIN:STANDARD TZNAME:GMT TZOFFSETFROM:+0100 TZOFFSETTO:+0000 DTSTART:19961027T020000 RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20260427T034933Z DTSTART;VALUE=DATE-TIME:20251027T130000 DTEND;VALUE=DATE-TIME:20251027T140000 SUMMARY:WCPM: Nick Tawn\, ÌÇÐÄTV University TZID:Europe/London UID:20251027-8ac672c598f027f20198f070772d13ba@warwick.ac.uk CREATED:20251021T090856Z DESCRIPTION:Location: Lecture Theatre 0.04 IMC Networking Lunch: The Rech arge Room\, next to Lecture Theatre 004\, from 12:30pm - 1pm. Title: Ann ealed Leap-Point Sampler for Multimodal Target Distributions Abstract: I n Bayesian statistics\, exploring high-dimensional multimodal posterior distributions poses major challenges for existing MCMC approaches. This paper introduces the Annealed Leap-Point Sampler (ALPS)\, which augments the target distribution state space with modified annealed (cooled) dis tributions\, in contrast to traditional tempering approaches. The coldes t state is chosen such that its annealed density is well-approximated lo cally by a Laplace approximation. This allows for automated setup of a s calable mode-leaping independence sampler. ALPS requires an exploration component to search for the mode locations\, which can either be run ada ptively in parallel to improve these mode-jumping proposals\, or else as a pre-computation step. A theoretical analysis shows that for a d-dimen sional problem the coolest temperature level required only needs to be l inear in dimension\, O (d)\, implying that the number of iterations need ed for ALPS to converge is O (d) (typically leading to overall complexit y O(d^3) when computational cost per iteration is taken into account). A LPS is illustrated on several complex\, multimodal distributions that ar ise from real-world applications. This includes a seemingly-unrelated re gression (SUR) model of longitudinal data from U.S. manufacturing firms\ , as well as a spectral density model that is used in analytical chemist ry for identification of molecular biomarkers. Bio: Dr Nick Tawn is a Re ader in Statistics at the University of ÌÇÐÄTV. His research interests have mostly focussed on developing scalable Monte Carlo methodology for use in complex Bayesian settings\; in particular MCMC and SMC techniques . He also takes a keen interest in the Machine Learning/Data Science lit erature with a view to using these methods to complement and accelerate the inference process. More specifically his research has focussed on MC MC methodology in settings where the target distribution exhibits multi- modality. My PhD thesis\, completed in 2017\, was titled "Towards Optima lity of the Parallel Tempering Algorithm". Since completion of his thesi s he has continued to work on similar problems whilst writing up the ide as from my thesis for publication. LOCATION:Lecture Theatre 0.04 IMC CATEGORIES:WCPM LAST-MODIFIED:20251021T090856Z ORGANIZER;CN=Jin Kang: END:VEVENT END:VCALENDAR