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This thesis explores the challenges and advancements in high-dimensional Bayesian optimization (HDBO), focusing on understanding, quantifying, and improving optimization techniques in high-dimensional spaces.Bayesian optimization (BO) is a powerful method for optimizing expensive black-box functions, but its effectiveness diminishes as the dimensionality of the search space increases due to the cu
Verket är beställt av Canzonetta, Kettil Skarby och uruppfört av dem i Eric Ericson-hallen i Stockholm. Opus 123. Besättning kör a cappella. Utgivet av Gehrmans Musikförlag. Text från romersk-katolska mässan: Må evigt ljus lysa över dem, Herre, med dina heliga för alltid, ty du är god. Ge dem evig vila, Herre,och må evigt ljus lysa över dem, för du är god.
Bayesian optimization is a widely used method for optimizing expensive black-box functions, with Expected Improvement being one of the most commonly used acquisition functions. In contrast, information-theoretic acquisition functions aim to reduce uncertainty about the function's optimum and are often considered fundamentally distinct from EI. In this work, we challenge this prevailing perspective
A well-balanced exploration-exploitation trade-off is crucial for successful acquisition functions in Bayesian optimization. However, there is a lack of quantitative measures for exploration, making it difficult to analyze and compare different acquisition functions. This work introduces two novel approaches - observation traveling salesman distance and observation entropy - to quantify the explor
Recent work reported that simple Bayesian optimization methods perform well for high-dimensional real-world tasks, seemingly contradicting prior work and tribal knowledge. This paper investigates the 'why'. We identify fundamental challenges that arise in high-dimensional Bayesian optimization and explain why recent methods succeed. Our analysis shows that vanishing gradients caused by Gaussian pr
Bayesian optimization (BO ) is an effective method for optimizing expensive-to-evaluate black-box functions. While high-dimensional problems can be particularly challenging, due to the multitude of parameter choices and the potentially high number of data points required to fit the model, this limitation can be addressed if the problem satisfies simplifying assumptions. Axis-aligned subspace appro
En version av detta verk finns redan för sopran och orkester men jag har gjort om det för sopran och stråkkvartett. Opus 115b. Flera framföranden i Sverige genomförda och det finns planer på framföranden både i Prag och i Schweiz men plats och datum är inte beslutade än. opus: Op. 115Concept Lisa Larsson, orchestration Rolf Martinssonduration: 25 minutes / 13 movements / 99 score pagesinstrumen
Episodiska minnen kan sträcka sig bortom direkta upplevelser. Till exempel, om du ser en kvinna promenera med en hund och senare observerar en man med samma hund, kan du dra slutsatsen att det finns en koppling mellan dem. Sådana inferenser är centrala för att möjliggöra flexibelt beslutsfattande och generalisering av tidigare kunskap till nya situationer, och anses bero på mekanismer för minnesinEpisodic memories can extend beyond direct experiences. For example, if you see a woman walking a dog and later observe a man walking the same dog, you might infer a connection between them. These inferences, crucial for making novel decisions and extending knowledge to new situations, are thought to rely on memory integration mechanisms.Two main mechanisms have been proposed for memory integratio
This study investigates how the brain encodes episodic events to support diverse memory functions. Thirty-six participants viewed movies simulating real-life interactions while EEG was recorded. They first watched movies featuring two characters (AB), followed by scenes where one original character interacted with a new one (BC). Memory was assessed for direct (AB and BC), indirect (AC) associatio
BACKGROUND: Haemophilus influenzae community-acquired pneumonia (CAP) is common, and it is equally common to Streptococcus pneumoniae in some settings. The purpose of this study was to provide additional data on patients affected by H. influenzae CAP and their outcomes.METHODS: Streptococcus pneumoniae-caused CAP (111 cases) was compared to CAP with H. influenzae (53 cases). Patients were adults (
Community-acquired pneumonia (CAP) is a significant health threat for adults. Although conjugate vaccines have reduced pneumococcal CAP incidence in children, Streptococcus pneumoniae-related CAP remains prevalent among older adults. The nasopharynx acts as a reservoir for S. pneumoniae, yet the interplay between this pathogen and the nasopharyngeal microbiome during and after pneumonia remains po
An efficient extension of conventional rate-dependent crystal plasticity is formulated to include the influence of block boundaries in lath martensite. It is shown that this can be achieved by minor modifications to a conventional crystal plasticity model, providing an efficient modeling approach with a negligible additional computational cost. With this modification, the parameter related to latt
Jordbrukslandskapet är en viktig livsmiljö för ungefär hälften av Europas växter och djur. Bevarande av biologisk mångfald i odlingslandskapet innebär bland annat att viktiga ekosystemtjänsterär bibehålls. Pollinerande insekter och naturliga fiender till skadegörare är exempel på organismer som utgör en betydande resurs i jordbruket av stor ekonomisk betydelse. Kunskap om hur jordbruksåtgärder, ti
Slättbygdslandskap saknar i stort födoresurser för pollinerande insekter. Insådd av blommande remsor har blivit allt vanligare runtom i Europa, som en del av ländernas miljöstödsprogram och som ett sätt att öka tillgången på blomresurser. Länder som England, Österrike och Tyskland har exempelvis miljöstöd för blommande remsor. Flera andra länder, bl.a. Sverige har ersättning för blommande ytor som
