Probabilistic Graphical Models for Crowdsourcing and Turbulence

Graphical models provide a useful framework and formalism from which to modeland solve problems involving random processes. We demonstrate the versatility and usefulness of graphical models on two problems, one involving crowdsourcing and one involving turbulence. In crowdsourcing, we consider the problem of inferring true labels from a set of crowdsourced annotations. We design generative models for the crowdsourced annotations involving as latent variables the worker reliability, the structure of the labels, and the ground truth labels. Furthermore, we design an effective inference algorithm to infer the latent variables. In turbulence, we consider the problem of modeling the mixing distribution of homogeneous isotropic passive scalar turbulence. We consider models specifying the conditional distribution of a coarse grained node given its adjacent coarse grained nodes. In particular, we demonstrate the effectiveness of a higher order moments based extension of the Gaussian distribution.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

doctoral

Discipline thesis:degree_discipline

Graduate College

Grantor dc:publisher

The University of Arizona.

Year dc:date.issued

2020

Author dc:creator

• Luo, Zhaorui

Advisor dc:contributor.advisor

• Yin, Junming

Committee members dc:contributor.committeemember

• Watkins, Joseph C.
• Zhang, Hao
• Chertkov, Michael

Statement dc:rights

• Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction, presentation (such as public display or performance) of protected items is prohibited except with permission of the author.

Language dc:language.iso

en

Handle dc:identifier.uri

http://hdl.handle.net/10150/656830

OAI identifier oai:identifier

oai:repository.arizona.edu:10150/656830