Abstract. We propose a novel convolutional neural network (CNN) based method for optic cup and disc segmentation. To reduce computational complexity, an entropy based sampling technique is introduced that gives superior results over uniform sampling. Filters are learned over several layers with the output of previous layers serving as the input to the next layer. A softmax logistic regression classifier is subsequently trained on the output of all learned filters. In several error metrics, the proposed algorithm outperforms existing methods on the public DRISHTI-GS data set.
In a mobility-on-demand system, travel requests are handled by a fleet of shared vehicles in an on-demand fashion. An important factor that determines the operational efficiency and service level of such a mobility-on-demand system is its operational policy that assigns available vehicles to open passenger requests and relocates idle vehicles. Previously described operational policies are based on control theoretical approaches, most notably on receding horizon control. In this work, we employ reinforcement learning techniques to design an operational policy for a mobility-on-demand system. In particular, we propose a cascaded learning framework to reduce the number of state-action pairs which allows for more efficient learning. We train our model using the AMoDeus simulation environment and real taxi trip travel data from the city of San Francisco. Finally, we demonstrate that our reinforcement learning based operational policy for mobility-on-demand systems outperforms state-of the art fleet operational policies that are based on conventional control theoretical approaches.
Typically, to enlarge the operating domain of an object detector, more labeled training data is required. We describe a method called wormhole learning, which allows to extend the operating domain without additional data, but only with temporary access to an auxiliary sensor with certain invariance properties.We describe the instantiation of this principle with a regular visible-light RGB camera as the main sensor, and an infrared sensor as the temporary sensor. We start with a pre-trained RGB detector; then we train the infrared detector based on the RGB-inferred labels; finally we re-train the RGB detector based on the infrared-inferred labels. After these two transferlearning steps, the RGB detector has enlarged its operating domain by inheriting part of the invariance to illumination of the infrared sensor; in particular, the RGB detector is now able to see much better at night.We analyze the wormhole learning phenomenon by bounding the possible gain in accuracy using mutual information properties of the two sensors and considered operating domain.
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