CDVAE: Co-embedding Deep Variational Auto Encoder for Conditional Variational Generation

Authors: Jiajun Lu, Aditya Deshpande, David Forsyth

Arxiv, Submitted to ICCV 2017

Abstract

Problems such as predicting a new shading field (Y ) for an image (X) are ambiguous: many very distinct solutions are good. Representing this ambiguity requires building a conditional model P(Y jX) of the prediction, conditioned on the image. Such a model is difficult to train, because we do not usually have training data containing many different shadings for the same image. As a result, we need different training examples to share data to produce good models. This presents a danger we call "code space collapse" — the training procedure produces a model that has a very good loss score, but which represents the conditional distribution poorly. We demonstrate an improved method for building conditional models by exploiting a metric constraint on training data that prevents code space collapse. We demonstrate our model on two example tasks using real data: image saturation adjustment, image relighting. We describe quantitative metrics to evaluate ambiguous generation results. Our results quantitatively and qualitatively outperform different strong baselines.

Results

Reshading results

Resaturation results

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