Date of Graduation

Summer 2020

Degree

Master of Science in Computer Science

Department

Computer Science

Committee Chair

Jamil M. Saquer

Keywords

machine learning, deep learning, graph analysis, cyberbullying, social media

Subject Categories

Artificial Intelligence and Robotics | Data Science

Abstract

Cyberbullying is an ongoing and devastating issue in today's online social media. Abusive users engage in cyber-harassment by utilizing social media to send posts, private messages, tweets, or pictures to innocent social media users. Detecting and preventing cases of cyberbullying is crucial. In this work, I analyze multiple machine learning, deep learning, and graph analysis algorithms and explore their applicability and performance in pursuit of a robust system for detecting cyberbullying. First, I evaluate the performance of the machine learning algorithms Support Vector Machine, Naïve Bayes, Random Forest, Decision Tree, and Logistic Regression. This yielded positive results and obtained upwards of 86% accuracy. Further enhancements were achieved using Evolutionary Algorithms, improving the overall results of the machine learning models. Deep Learning algorithms was the next experiment in which efficiency was monitored in terms of training time and performance. Next, analysis of Recurrent Neural Networks and Hierarchical Attention Networks was conducted, achieving 82% accuracy. The final research project used graph analysis to explore the relation among different social media users, and analyze the connectivity and communities of users who were discovered to have posted offensive messages.

Copyright

© Jesse D. Simpson

Available for download on Thursday, December 31, 2020

Open Access

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