Hybrid Machine Learning Methods for the Interpretation and Integration of Heterogeneous Multimodal

Madalina Fitereau - Postdoctoral Fellow, Computer Science Department, Stanford University

Feb. 21, 2018, 10 a.m. - Feb. 21, 2018, 11 a.m.



The prevalence of smartphones and wearable devices and the widespread use of electronic health records have led to a surge in multimodal health data that is noisy, non-uniform, and collected at an unprecedented scale. This talk focuses on machine learning models that learn expressive representations of multimodal, heterogeneous data for biomedical predictive models designed to interact with domain experts. In the first part of the talk, the focus is on techniques for partitioning data and leveraging low-dimensional structure to enable visualization and annotation by humans. The latter part addresses the construction of hybrid models that combine deep learning with random forests, and the fusing of structured information into temporal representation learning. This array of methods obviates the need for feature engineering while improving on the state of the art for diverse biomedical applications. Use cases include the classification of alerts in a vital sign monitoring system, the prediction of surgical outcomes in children with cerebral palsy, and forecasting the progression of osteoarthritis from subjects' physical activity.



Madalina Fiterau is a Postdoctoral Fellow in the Computer Science Department at Stanford University, working with Professors Chris Ré and Scott Delp in the Mobilize Center. She has obtained a PhD in Machine Learning from Carnegie Mellon University in September 2015, advised by Professor Artur Dubrawski. The focus of her PhD thesis, entitled “Discovering Compact and Informative Structures through Data Partitioning”, is learning interpretable ensembles, with applicability ranging from image classification to clinical alert prediction. Madalina is currently expanding her research on interpretable models, in part by applying deep learning to obtain salient representations from biomedical “deep” data, including time series, text and images. Madalina is the recipient of the Marr Prize for Best Paper at ICCV 2015 and of Star Research Award at the Annual Congress of the Society of Critical Care Medicine 2016. She has co-organized NIPS workshops on the topic of Machine Learning in Healthcare in 2013, 2014, 2016 and 2017.