Nuclear detection using higher-order topic modeling

Christie Nelson, William M. Pottenger, Hannah Keiler, Nir Grinberg

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

7 Scopus citations

Abstract

In this paper, a novel approach to topic modeling based on the Higher Order Learning framework, Higher-Order Latent Dirichlet Allocation (HO-LDA), is applied to a critical issue in homeland security, nuclear detection. In addition, this research strives to improve topic models in the 'real time' environment of online learning. In total, seventeen different nuclear radioisotopes are classified, and performance of Higher-Order versus traditional techniques is evaluated. This project employs LDA and HO-LDA on a nuclear detection numeric dataset to gain a topic decomposition of instances. These learned topics are then used as features in a traditional supervised classification algorithm. In essence, the LDA or HO-LDA topic assignments are used as features in supervised learning algorithms that predict the class (isotope), treating LDA or HO-LDA as a feature space transform. Using Topic Modeling on numeric nuclear detection data is cutting edge, as to our knowledge this has never been done before on a nuclear detection dataset. Two methods of feature transformation are evaluated, including Multinomial Feature Creation and Maximum Channel Value Feature Creation. Results demonstrate further evidence that Higher Order Learning techniques can be usefully applied in topic modeling applied to nuclear detection.

Original languageEnglish
Title of host publication2012 IEEE International Conference on Technologies for Homeland Security, HST 2012
Pages637-642
Number of pages6
DOIs
StatePublished - 1 Dec 2012
Externally publishedYes
Event2012 12th IEEE International Conference on Technologies for Homeland Security, HST 2012 - Waltham, MA, United States
Duration: 13 Nov 201215 Nov 2012

Publication series

Name2012 IEEE International Conference on Technologies for Homeland Security, HST 2012

Conference

Conference2012 12th IEEE International Conference on Technologies for Homeland Security, HST 2012
Country/TerritoryUnited States
CityWaltham, MA
Period13/11/1215/11/12

Keywords

  • HO-LDA
  • LDA
  • higher-order latent Dirichlet allocation
  • higher-order learning
  • higher-order topic modeling
  • latent Dirichlet allocation
  • machine learning
  • nuclear detection
  • topic modeling

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