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Deep Neural Networks (DNNs) have gained much interest during the last years. Among many sucessful applications, DNNs have shown outstanding performance in the task of learning feature representations and classification of images. A state-of-art, high accurate, neural network trained to classify 1.2 million images using 60 million parameters and 650,000 neurons was developed by Hinton et al. (2012). However, recent findings reveal delicate difficulties on noise robustness in DNNs, Szegedy et al (2013). The purpose of the thesis is to characterize the sensitivity of DNNs and potentially make suggestions on how robustness can be achieved. The thesis project aims at two related studies. Firstly, the master student will investigate how meaningsless, to human, images are classified with high confidence using DNNs, as reported by other studies. Secondly, the student will investige DNNs misclassifications of images with small pertubations, not visible to humans. Moreover, the student is also encouraged to apply image preprocessing methods in order to increase classification accuracy. Four work packages are suggested: 1. Background study on DNNs and related reserarch. 2. Practical tests on DNNs on medium size datasets. 3. Investigation of distorted (meaningless) images classified with high confidence. 4. Investigation of misclassifications of images with small pertubations not visible to humans. The result is expected to include investigation results and conclusions on both of the concerned research questions described above.
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