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  • 1.
    Bruzzone, Andrea
    Linköping University, Department of Computer and Information Science, The Division of Statistics and Machine Learning.
    P-SGLD: Stochastic Gradient Langevin Dynamics with control variates2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Year after years, the amount of data that we continuously generate is increasing. When this situation started the main challenge was to find a way to store the huge quantity of information. Nowadays, with the increasing availability of storage facilities, this problem is solved but it gives us a new issue to deal with: find tools that allow us to learn from this large data sets. In this thesis, a framework for Bayesian learning with the ability to scale to large data sets is studied. We present the Stochastic Gradient Langevin Dynamics (SGLD) framework and show that in some cases its approximation of the posterior distribution is quite poor. A reason for this can be that SGLD estimates the gradient of the log-likelihood with a high variability due to naïve sampling. Our approach combines accurate proxies for the gradient of the log-likelihood with SGLD. We show that it produces better results in terms of convergence to the correct posterior distribution than the standard SGLD, since accurate proxies dramatically reduce the variance of the gradient estimator. Moreover, we demonstrate that this approach is more efficient than the standard Markov Chain Monte Carlo (MCMC) method and that it exceeds other techniques of variance reduction proposed in the literature such as SAGA-LD algorithm. This approach also uses control variates to improve SGLD so that it is straightforward the comparison with our approach. We apply the method to the Logistic Regression model. 

  • 2.
    Gholmi, Allan
    Linköping University, Department of Computer and Information Science.
    Evaluating spatial mapping using interpolation techniques2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 3.
    Olsson, Linn
    Linköping University, Department of Computer and Information Science.
    Wayfinding ur ett serviceperspektiv: En studie av digitala artefakter i en företagsmiljö2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    En utvärderande studie av digitala touchpoints i ett besöksflöde. Teorier som nyttjas i studien är mentala modeller, situerad kognition och externa reprepresentationer. I metodvalet utvärderas kontextuell design samt service walkthrough angående vilken metod som är mest lämplig.  Totalt deltog 15 testdeltagare i en uppgiftsbaserad testning med kontextuell design, service walkthrough med paus och service walkthrough utan paus. Resultatet visar att alla digitala touchpoints möter testdeltagarnas bild tillräckligt bra för att de ska klara den uppgiftsbaserade testningen. Efter detta följer en diskussion angående hur teorierna kan länkas till resultatet och med detta även hur flödet kan förbättras och vad man ska tänka på vid vidareutveckling av systemet. 

1 - 3 of 3
CiteExportLink to result list
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
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