Pixel Club: Bi-level Optimization with Application to Rank Pooling for Activity Recognition

סטפן גולד (אונ' אוסטרליה)
יום שלישי, 29.3.2016, 14:30
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל

In this talk I will first give a brief overview of the topic of bi-level mathematical programming, in which the solution of an inner optimization problem is used within the objective function of a outer problem. These problems were originally studied in the context of two-player games but have been recently applied to computer vision and machine learning applications. I will then discuss current work in our group that applies bi-level optimization to the problem of activity recognition in videos. Here we train an end-to-end classifier consisting of a convolutional neural network to encode video frames and rank pooling operation to capture activity dynamics. Our method achieves state of the art results on a number of activity recognition benchmark datasets.

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