Learning Generative Models with Energy-Based Models and Transformer GANs
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Learning Generative Models with Energy-Based Models and Transformer GANs


In this thesis, we study approaches to learn priors on data (i.e. generative modeling) and learners (i.e. meta-learning) for computer vision tasks. We present our approaches to improve the stability and performance of generative modeling and meta-learning methods. First, we study the use of natural image prior on computer vision tasks. To this end, we introduce a suite of regularization techniques that enhances the performance of energy-based models on realistic image datasets. On generative modeling, we achieve competitive results while using much smaller models. On supervised classification, we observe a significant error reduction against adversarial examples. Our model is the first computer vision model to achieve state-of-the-art image generation and classification within a single model. Next, we investigate if natural image prior can be learned with less vision-specific inductive biases. To this end, we integrate the Vision Transformer architecture into generative adversarial networks (GAN). We propose novel regularization methods and architectural choices to achieve this goal. The resulting approach, named ViTGAN, achieves comparable performance to the leading CNN-based GAN models on popular image generation benchmarks for the first time. Lastly, we study a meta-learning approach, which automatically extracts prior knowledge from the set of observed tasks. We present our work on improving the computational complexity of meta-learning. Our approach, named MetaOptNet, offers better few-shot generalization at a modest increase in computational overhead.

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