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October 7, 2019 10:30 am - 11:30 am EDT
Title: Unearthing the Relationship Between Graph Neural Networks and Matrix Factorization
Speaker: Bruno Ribeiro, Assistant Professor of Computer Science, Purdue University
Date: Monday, October 7th, 2019
Location: Northeastern University, 177 Huntington Avenue, Boston Massachusetts 02115, 11th Floor
Graph tasks are ubiquitous, with applications ranging from recommendation systems, to language understanding, to automation with environmental awareness and molecular synthesis. A fundamental challenge in applying machine learning to these tasks has been encoding (representing) the graph structure in a way that ML models can easily exploit the relational information in the graph, including node and edge features. Until recently, this encoding has been performed by factor models (a.k.a. graph embeddings), which originated in 1904 with Spearman’s common factors. Recently, however, graph neural networks have introduced a new powerful way to encode graphs for machine learning models. In my talk, I will describe these two approaches and then introduce a unifying mathematical framework that connects them. Using this novel framework, I will introduce new practical guidelines to generating and using node embeddings and graph representations, which fixes significant shortcomings of the standard operating procedures used today.
Joint work with Ryan Murphy, Bala Shrinivasan, and Vinayak Rao.
About the Speaker
Bruno Ribeiro is an Assistant Professor in the Department of Computer Science at Purdue University. He obtained his Ph.D. at the University of Massachusetts Amherst and did his postdoctoral studies at Carnegie Mellon University from 2013-2015. His research interests are in deep learning and data mining, with a focus on sampling and modeling relational and temporal data.