March 1st - Filipe Condessa

Filipe Condessa (IT/IST-UL, CMU)

Robust Classification with Context and Rejection


In some real-world applications of machine learning, despite the investments in the training of classification systems and in feature selection, misclassifications occur and their effects are critical. This is common in ill-posed classification problems, where overlapping classes, small or incomplete training sets, and unknown classes are prevalent. We can mitigate misclassifications and their effects by adapting the behavior of the classifier on samples with high potential for misclassification through the use of context and rejection. This combines the advantages brought by use of contextual priors in classification with the advantages of classification with rejection. In classification with rejection, we are able to increase classification performance at the expense of not classifying the entire data set. In this talk we explore the design of robust classifiers using context and rejection and the evaluation of performance of classifiers with rejection. We illustrate the results of robust classification on natural image segmentation, hyperspectral image classification, and automated digital histopathology.


Bio: Filipe Condessa received the BSc. and MSc. degree from Instituto Superior Tecnico (IST), Technical University of Lisbon (TULisbon, now University of Lisbon), Portugal, in 2009 and 2011, in biomedical engineering. He is currently working toward the Ph.D. degree in electrical and computer engineering at Carnegie Mellon University, USA, and at IST, Portugal. He was awarded the 2015 Mikio Takagi prize for best student paper at the IEEE Geoscience and Remote Sensing Symposium in Milan, Italy. His research interests include hyperspectral image classification and biomedical image classification, with the current focus on the design of robust classification techniques combining rejection and context.