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Multi-View Relationships for Analytics and Inference

thesis
posted on 24.02.2020 by Eric Lei
An interesting area of machine learning is methods for multi-view data, relational data whose features have been partitioned. Multi-view learning exploits relationships between views, giving it certain advantages over traditional single-view techniques, which may struggle to fi nd these
relationships or only learn them implicitly. These relationships are often especially salient in understanding the data or performing prediction. This work explores an underutilized approach in multi-view learning: to focus on multi-view relationships|the latent variables that govern
relations between views|themselves as units of analysis. We investigate how this approach impacts analytics and inference in ways that standard multi-view and single-view learning cannot. We hypothesize that by ignoring relations between views or factoring them in only indirectly,
standard approaches risk overlooking key structure. Accordingly, our goal is to investigate the extent multi-view relationships can be characterized and employed as units of analysis in descriptive analytics and inference. We present novel methods to do so, either using domain knowledge or by learning from data, which reveal structure that alternative methods do not or have competitive performance with the state of the art. Empirical results are presented in several application domains. First, we use domain knowledge to assume a known form for multi-view relationships in the
task of gamma source detection. We aggregate the views by filtering their inferences collectively to perform classi cation. Second, we assume multi-view relationships are linear and learn them from data in a di fferent approach toward gamma source detection. Our method detects anomalies when these relationships are disrupted. Third, we relax the assumption
of linearity and propose a novel clustering method that finds cluster-wise linear relationships. This method discovers explanatory structure in a medical problem. Fourth, we extend this method to classifi cation and demonstrate its competitive performance on a load monitoring problem.

History

Date

18/08/2019

Degree Type

Dissertation

Department

Machine Learning

Degree Name

  • Doctor of Philosophy (PhD)

Advisor(s)

Artur Dubrawski

Exports