9,217 research outputs found
Slice sampling covariance hyperparameters of latent Gaussian models
The Gaussian process (GP) is a popular way to specify dependencies between
random variables in a probabilistic model. In the Bayesian framework the
covariance structure can be specified using unknown hyperparameters.
Integrating over these hyperparameters considers different possible
explanations for the data when making predictions. This integration is often
performed using Markov chain Monte Carlo (MCMC) sampling. However, with
non-Gaussian observations standard hyperparameter sampling approaches require
careful tuning and may converge slowly. In this paper we present a slice
sampling approach that requires little tuning while mixing well in both strong-
and weak-data regimes.Comment: 9 pages, 4 figures, 4 algorithms. Minor corrections to previous
version. This version to appear in Advances in Neural Information Processing
Systems (NIPS) 23, 201
A tool-mediated cognitive apprenticeship approach for a computer engineering course
Teaching database engineers involves a variety of learning activities. A strong focus is on practical problems that go beyond the acquisition of knowledge. Skills and experience are equally important. We propose a virtual apprenticeship model for the knowledge- and skillsoriented Web-based education of database students. We adapt the classical cognitive apprenticeship theory to the Web context utilising scaffolding and activity theory. The choice of educational media and the forms of student interaction with the media are central success criteria
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