|Talks|

Latent Space Model for Multimodal Social Data

Visiting speaker
Past Talk
Aram Galstyan
Information Sciences Institute, University of Southern California
Oct 27, 2016
11:00 am
Oct 27, 2016
11:00 am
In-person
4 Thomas More St
London E1W 1YW, UK
The Roux Institute
Room
100 Fore Street
Portland, ME 04101
Network Science Institute
2nd floor
Network Science Institute
11th floor
177 Huntington Ave
Boston, MA 02115
Network Science Institute
2nd floor
Room
58 St Katharine's Way
London E1W 1LP, UK

Talk recording

Studies of social systems have traditionally focused on analyzing networks induced by social interactions, while discarding rich contextual information on nodes and their properties. At the same time, empirical evidence points to strong correlations between node attributes and their interactions.  Here we suggest a viable framework for analyzing attribute-rich and multi-modal social data based on latent space models. In this approach, each node is assigned an unobserved (latent) position in some space, so that both the nodes’ attributes and their interactions depend on their coordinates in this space. This “shared” latent space allows to capture observed correlations between the attributes and network structure. We perform extensive experiments  where the goal is predict missing links in a network using attributes, or predict user attributes based on network information, and observe that the proposed method outperforms other baselines in both prediction tasks.

About the speaker
Dr. Aram Galstyan is Research Director for machine learning and data science at the Information Sciences Institute, University of Southern California, and Research Associate Professor in the USC Computer Science Department. Dr. Galstyan’s current research focuses on various problems at the intersection of machine learning, information theory, and statistical physics. His research includes both theoretical effort and more application-oriented work geared toward describing various real-world phenomena. His research has been supported by various U.S. funding agencies, including NSF, NIH, DARPA, IARPA, and ARO.
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Oct 27, 2016