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deep generative models for highly structured data, dgs@iclr 2019 workshop

Deep Generative Models for Highly Structured Data, DGS@ICLR ...

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2019 deep generative models for highly structured data, dgs@iclr 2019 workshop

The proceedings contain 42 papers. The topics discussed include: generating molecules via chemical reactions;a seed-augment-train framework for universal digit classification;learning deep latent-variable MRFS with amortized Bethe free energy minimization;unsupervised demixing of structured signals from their superposition using GANs;learning to defense by learning to attack;smoothing nonlinear variational objectives with sequential Monte Carlo;adjustable real-time style transfer;on the relationship between normalizing flows and variational- and denoising autoencoders;disentangled state space models: unsupervised learning of dynamics across heterogeneous environments;compositional GAN: learning image-conditional binary composition;AlignFlow: learning from multiple domains via normalizing flows;and dual space learning with variational autoencoders.

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Debiasing deep generative models via likelihood-free importance weighting

Debiasing deep generative models via likelihood-free importa...

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2019 deep generative models for highly structured data, dgs@iclr 2019 workshop

作者： Anonymous

A learned generative model often gives biased statistics relative to the underlying data distribution. A standard technique to correct this bias is by importance weighting samples from the model by the likelihood ratio under the model and true distributions. When the likelihood ratio is unknown, it can be estimated by training a probabilistic classifier to distinguish samples from the two distributions. In this paper, we employ this likelihood-free importance weighting framework to correct for the bias in using state-of-the-art deep generative models. We find that this technique consistently improves standard goodness-of-fit metrics for evaluating the sample quality of state-of-the-art generative models, suggesting reduced bias. Finally, we demonstrate its utility on representative applications in a) data augmentation for classification using generative adversarial networks, and b) model-based policy evaluation using off-policy data. © deep generative models for highly structured data, dgs@iclr 2019 *** right reserved.

关键词： generative adversarial networks

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deep generative models for generating labeled graphs

Deep generative models for generating labeled graphs

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2019 deep generative models for highly structured data, dgs@iclr 2019 workshop

作者： Fan, Shuangfei Huang, Bert Virginia Tech. United States

As a new way to train generative models, generative adversarial networks (GANs) have achieved considerable success in image generation, and this framework has also recently been applied to data with graph structures. We identify the drawbacks of existing deep frameworks for generating graphs, and we propose labeledgraph generative adversarial networks (LGGAN) to train deep generative models for graph-structured data with node labels. We test the approach with different discriminative models as well as different GAN frameworks on various types of graph datasets, such as collections of citation networks and protein graphs. Experiment results show that our model can generate diverse labeled graphs that match the structural characteristics of the training data and outperforms all baselines in terms of quality, generality, and scalability. © deep generative models for highly structured data, dgs@iclr 2019 *** right reserved.

关键词： generative adversarial networks

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generative models for graph-based protein design

Generative models for graph-based protein design

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2019 deep generative models for highly structured data, dgs@iclr 2019 workshop

作者： Ingraham, John Garg, Vikas K. Barzilay, Regina Jaakkola, Tommi CSAIL MIT United States

Engineered proteins offer the potential to solve many problems in biomedicine, energy, and materials science, but creating designs that succeed is difficult in practice. A significant aspect of this challenge is the complex coupling between protein sequence and 3D structure, and the task of finding a viable design is often referred to as the inverse protein folding problem. We develop generative models for protein sequences conditioned on a graph-structured specification of the design target. Our approach efficiently captures the complex dependencies in proteins by focusing on those that are long-range in sequence but local in 3D space. Our framework significantly improves upon prior parametric models of protein sequences given structure, and takes a step toward rapid and targeted biomolecular design with the aid of deep generative models. © deep generative models for highly structured data, dgs@iclr 2019 *** right reserved.

关键词： Proteins

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Unsupervised demixing of structured signals from their superposition using GANs

Unsupervised demixing of structured signals from their super...

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2019 deep generative models for highly structured data, dgs@iclr 2019 workshop

作者： Anonymous

Recently, generative Adversarial Networks (GANs) have emerged as a popular alternative for modeling complex high dimensional distributions. Most of the existing works implicitly assume that the clean samples from the target distribution are easily available. However, in many applications, this assumption is violated. In this paper, we consider the observation setting in which the samples from a target distribution are given by the superposition of two structured components, and leverage GANs for learning of the structure of the components. We propose a novel framework, demixing-GAN, which learns the distribution of two components at the same time. Through extensive numerical experiments, we demonstrate that the proposed framework can generate clean samples from unknown distributions, which further can be used in demixing of the unseen test images. © deep generative models for highly structured data, dgs@iclr 2019 *** right reserved.

关键词： generative adversarial networks

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Perceptual generative autoencoders

Perceptual generative autoencoders

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2019 deep generative models for highly structured data, dgs@iclr 2019 workshop

作者： Zhang, Zijun Zhang, Ruixiang Li, Zongpeng Bengio, Yoshua Paull, Liam University of Calgary Canada MILA Université de Montréal Canada Wuhan University China

Modern generative models are usually designed to match target distributions directly in the data space, where the intrinsic dimensionality of data can be much lower than the ambient dimensionality. We argue that this discrepancy may contribute to the difficulties in training generative models. We therefore propose to map both the generated and target distributions to the latent space using the encoder of a standard autoencoder, and train the generator (or decoder) to match the target distribution in the latent space. The resulting method, perceptual generative autoencoder (PGA), is then incorporated with maximum likelihood or variational autoencoder (VAE) objective to train the generative model. With maximum likelihood, PGA generalizes the idea of reversible generative models to unrestricted neural network architectures and arbitrary latent dimensionalities. When combined with VAE, PGA can generate sharper samples than vanilla VAE. © deep generative models for highly structured data, dgs@iclr 2019 *** right reserved.

关键词： Maximum likelihood

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A rad approach to deep mixture models

A rad approach to deep mixture models

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2019 deep generative models for highly structured data, dgs@iclr 2019 workshop

作者： Dinh, Laurent Sohl-Dickstein, Jascha Pascanu, Razvan Larochelle, Hugo Google Brain United States DeepMind United Kingdom

Flow based models such as REAL NVP are an extremely powerful approach to density estimation. However, existing flow based models are restricted to transforming continuous densities over a continuous input space into similarly continuous distributions over continuous latent variables. This makes them poorly suited for modeling and representing discrete structures in data distributions, for example class membership or discrete symmetries. To address this difficulty, we present a normalizing flow architecture which relies on domain partitioning using locally invertible functions, and possesses both real and discrete valued latent variables. This Real and Discrete (RAD) approach retains the desirable normalizing flow properties of exact sampling, exact inference, and analytically computable probabilities, while at the same time allowing simultaneous modeling of both continuous and discrete structure in a data distribution. © deep generative models for highly structured data, dgs@iclr 2019 *** right reserved.

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structured prediction using cGANs with fusion discriminator

Structured prediction using cGANs with fusion discriminator

引用

2019 deep generative models for highly structured data, dgs@iclr 2019 workshop

作者： Mahmood, Faisal Xu, Wenhao Durr, Nicholas J. Johnson, Jeremiah W. Yuille, Alan Department of Biomedical Engineering Johns Hopkins University BaltimoreMD21218 United States Department of Applied Engineering and Sciences University of New Hampshire ManchesterNH03101 United States Department of Computer Science Johns Hopkins University BaltimoreMD21218 United States

We propose the fusion discriminator, a single unified framework for incorporating conditional information into a generative adversarial network (GAN) for a variety of distinct structured prediction tasks, including image synthesis, semantic segmentation, and depth estimation. Much like commonly used convolutional neural network - conditional Markov random field (CNN-CRF) models, the proposed method is able to enforce higher-order consistency in the model, but without being limited to a very specific class of potentials. The method is conceptually simple and flexible, and our experimental results demonstrate improvement on several diverse structured prediction tasks. © deep generative models for highly structured data, dgs@iclr 2019 *** right reserved.

关键词： Discriminators

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Compositional gan (Extended abstract): Learning image-conditional binary composition

Compositional gan (Extended abstract): Learning image-condit...

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2019 deep generative models for highly structured data, dgs@iclr 2019 workshop

作者： Azadi, Samaneh Pathak, deepak Ebrahimi, Sayna Darrell, Trevor University of California Berkeley United States

generative Adversarial Networks (GANs) can produce images of surprising complexity and realism but are generally structured to sample from a single latent source ignoring the explicit spatial interaction between multiple entities that could be present in a scene. Capturing such complex interactions between different objects in the world, including their relative scaling, spatial layout, occlusion, or viewpoint transformation is a challenging problem. In this work, we compose a pair of objects in a conditional GAN framework using a novel self-consistent composition-by-decomposition network. Given object images from two distinct distributions, our model can generate a realistic composite image from their joint distribution following the texture and shape of the input objects. Our results reveal that the learned model captures potential interactions between the two object domains, and can output their realistic composed scenes at test time. © deep generative models for highly structured data, dgs@iclr 2019 *** right reserved.

关键词： generative adversarial networks

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Generating diverse high resolution images with VQ-VAE

Generating diverse high resolution images with VQ-VAE

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2019 deep generative models for highly structured data, dgs@iclr 2019 workshop

作者： Razavi, Ali Van Den Oord, Aäron Vinyals, Oriol DeepMind United Kingdom

We explore the use of Vector Quantized Variational AutoEncoder (VQ-VAE) models for large scale image generation. To this end, we scale and enhance the autoregressive priors used in VQ-VAE to generate synthetic samples of much higher coherence and fidelity than possible before. We use simple feed-forward encoder and decoder networks, thus our model is an attractive candidate for applications where the encoding and decoding speed is critical. Additionally, this allows us to only sample autoregressively in the compressed latent space, which is an order of magnitude faster than sampling in the pixel space, especially for large images. We demonstrate that a multi-scale hierarchical organization of VQ-VAE, augmented with powerful priors over the latent codes, is able to generate samples with quality that rivals that of state of the art generative Adversarial Networks on multifaceted datasets such as ImageNet, while not suffering from GAN's known shortcomings such as mode collapse and lack of diversity. © deep generative models for highly structured data, dgs@iclr 2019 *** right reserved.

关键词： generative adversarial networks

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