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Intelligent tutoring systems that utilize Bayesian Knowledge Tracing have achieved the ability to accurately predict student performance not only within the intelligent tutoring system, but on paper post-tests outside of the system. Recent work has suggested that contextual estimation of student guessing and slipping leads to better prediction within the(More)
We present AttribIt, an approach for people to create visual content using relative semantic attributes expressed in linguistic terms. During an off-line processing step, AttribIt learns semantic attributes for design components that reflect the high-level intent people may have for creating content in a domain (e.g. adjectives such as "dangerous", "scary"(More)
Reinforcement learning is a simple, and yet, comprehensive theory of learning that simultaneously models the adaptive behavior of artificial agents, such as robots and autonomous software programs, as well as attempts to explain the emergent behavior of biological systems. It also gives rise to computational ideas that provide a powerful tool to solve(More)
This paper presents a new approach to representation discovery in reinforcement learning (RL) using basis adaptation. We introduce a general framework for basis adaptation as nonlinear separable least-squares value function approximation based on finding Fréchet gradients of an error function using variable projection func-tionals. We then present a(More)
Natural actor-critics form a popular class of policy search algorithms for finding locally optimal policies for Markov decision processes. In this paper we address a drawback of natural actor-critics that limits their real-world applicability—their lack of safety guarantees. We present a principled algorithm for performing natural gradient descent over a(More)
Although many machine learning algorithms involve learning subspaces with particular characteristics , optimizing a parameter matrix that is constrained to represent a subspace can be challenging. One solution is to use Riemannian optimization methods that enforce such constraints implicitly, leveraging the fact that the feasible parameter values form a(More)
Laser-induced breakdown spectroscopy (LIBS) is currently being used on-board the Mars Science Laboratory rover Curiosity to predict elemental abundances in dust, rocks, and soils using a partial least squares regression model developed by the ChemCam team. Accuracy of that model is constrained by the number of samples needed in the calibration, which grows(More)
ACKNOWLEDGMENTS I would like to express my sincere thanks to my thesis advisor, Sridhar Mahadevan. Sridhar has been such a helpful advisor, and every aspect of this thesis has benefited from his guidance and support throughout my graduate studies. I also like to thank Sridhar for giving me great patience and support to explore many different ideas and(More)
Spectroscopic measurements represent one of the cornerstones of extragalactic and planetary science observations , but data processing techniques for dealing with various wavelengths are extremely variable. Nearly all of them share a common pre-processing step, which is the removal of extraneous signal from the data of interest. The baseline itself can be(More)