Explaining in Style: Training a GAN to explain a classifier in
StyleSpace
Oran Lang, Yossi Gandelsman, Michal Yarom, Yoav Wald, Gal Elidan, Avinatan
Hassidim, William T. Freeman, Phillip Isola, Amir Globerson, Michal Irani and
Inbar Mosseri.
Paper: https://arxiv.org/abs/2104.13369
Abstract: *Image classification models can depend on multiple different semantic attributes of the image. An explanation of the decision of the classifier needs to both discover and visualize these properties. Here we present StylEx, a method for doing this, by training a generative model to specifically explain multiple attributes that underlie classifier decisions. A natural source for such attributes is the StyleSpace of StyleGAN, which is known to generate semantically meaningful dimensions in the image. However, because standard GAN training is not dependent on the classifier, it may not represent these attributes which are important for the classifier decision, and many dimensions of StyleSpace may represent irrelevant attributes. To overcome this, we propose a training procedure for a StyleGAN, which incorporates the classifier model, in order to learn a classifier-specific StyleSpace. Explanatory attributes are then selected from this space. These can be used to visualize the effect of changing multiple attributes per image, thus providing image-specific explanations. We apply StylEx to multiple domains, including animals, leaves, faces and retinal images. For these, we show how an image can be modified in different ways to change its classifier output. Our results show that the method finds attributes that align well with semantic ones, generate meaningful image-specific explanations, and are human-interpretable as measured in user-studies. *
Use this colab to load the weights of a pre-trained StyleGAN2 model trained on age classifier, and to find and manipulate the Style indices which correspond to the most important attributes for this classifier. The colab has an implementation of the AttFind algorithm from the paper, and has utilities to visualize these attributes.
This colab is licensed under the terms of the Apache license. See LICENSE for more information.
This is not an officially supported Google product.