no code implementations • 11 Jan 2024 • Xu Cai, Jonathan Scarlett
In this paper, we study the problem of estimating the normalizing constant $\int e^{-\lambda f(x)}dx$ through queries to the black-box function $f$, where $f$ belongs to a reproducing kernel Hilbert space (RKHS), and $\lambda$ is a problem parameter.
no code implementations • 22 Feb 2022 • Xu Cai, Chi Thanh Lam, Jonathan Scarlett
In this paper, we study error bounds for {\em Bayesian quadrature} (BQ), with an emphasis on noisy settings, randomized algorithms, and average-case performance measures.
no code implementations • 25 Oct 2021 • Yu Zhang, Chen Zhang, Renxin Yang, Jing Lyu, Li Liu, Xu Cai
The MMC-HVDC connected offshore wind farms (OWFs) could suffer short circuit fault (SCF), whereas their transient stability is not well analysed.
no code implementations • 23 May 2021 • Yu Zhang, Chen Zhang, Xu Cai
Grid-synchronization stability (GSS) is an emerging stability issue of grid-tied voltage source converters (VSCs), which can be provoked by severe grid voltage sags.
1 code implementation • 11 Feb 2021 • Xu Cai, Selwyn Gomes, Jonathan Scarlett
In this paper, we study the problem of Gaussian process (GP) bandits under relaxed optimization criteria stating that any function value above a certain threshold is "good enough".
no code implementations • 20 Aug 2020 • Xu Cai, Jonathan Scarlett
In a robust setting in which every sampled point may be perturbed by a suitably-constrained adversary, we provide a novel lower bound for deterministic strategies, demonstrating an inevitable joint dependence of the cumulative regret on the corruption level and the time horizon, in contrast with existing lower bounds that only characterize the individual dependencies.
no code implementations • 4 Dec 2018 • Xu Cai, Yang Wu, Guanbin Li, Ziliang Chen, Liang Lin
FRAME (Filters, Random fields, And Maximum Entropy) is an energy-based descriptive model that synthesizes visual realism by capturing mutual patterns from structural input signals.