Feature enhancement with deep generative models in deep bayesian active learning

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2022-9

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Duymuş, Pınar Ezgi

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Data-intensive models emerge as new advances in Deep Learning take place. However, access to annotated datasets with many data points is not constantly prevalent. This situation emphasizes the need for Active Learning to select the least possible amount of data without compromising the accuracy of the classifier models. Recent advancements occur in Deep Bayesian Active Learning (DBAL), which means incorporating uncertainty of model parameters into a Deep Network. In this work, we present an algorithm that improves the accuracy of a DBAL model in an image classification task. We utilize the representation power of Deep Generative Models by employing their feature extraction capabilities. We obtain improved feature space representation of input data referred to as a latent vector by training a generative model. Instead of using the entire image space in the active learning setting, we demonstrate that utilizing latent space provides better data point selection for the active learning problem, hence obtaining higher accuracy. Furthermore, this study compares different generative models in terms of the ability to capture better feature representation. The informativeness of the data points defines how well an active learning algorithm performs. Therefore, capturing the latent space representation of a data point by extracting the highest information value possible is a significant contribution. We provide comparisons and experiments on different kinds of Generative Models, namely Vanilla Variational Autoencoders (VAEs), Maximum Mean Discrepancy Variational Autoencoders (MMDVAE) and Bidirectional Generative Adversarial Networks (BiGANs). Additionally, Bayesian Active Learning suffers from the Mode- Collapse problem. In order to ease that, we propose a diversity-based query algorithm to enhance the diversity of active points and improve the accuracy of the algorithm.

Subject Keywords

Bayesian active learning, Deep generative models, Feature learning, Latent space representation, Mode-collapse problem

URI

https://hdl.handle.net/11511/99446

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

P. E. Duymuş, “Feature enhancement with deep generative models in deep bayesian active learning,” M.S. - Master of Science, Middle East Technical University, 2022.