Despite the recent advance of Generative Adversarial Networks (GANs) in high-fidelity image synthesis, there lacks enough understandings on how GANs are able to map the latent code sampled from a random distribution to a photo-realistic image. Previous work assumes the latent space learned by GAN follows a distributed representation but observes the vector arithmetic phenomenon of the output's semantics in latent space. In this work, we interpret the semantics hidden in the latent space of well-trained GANs. We find that the latent code for well-trained generative models, such as ProgressiveGAN and StyleGAN, actually learns a disentangled representation after some linear transformations. We make a rigorous analysis on the encoding of various semantics in the latent space as well as their properties, and then study how these semantics are correlated to each other. Based on our analysis, we propose a simple and general technique, called InterFaceGAN, for semantic face editing in latent space. Given a synthesized face, we are able to faithfully edit its various attributes such as pose, expression, age, presence of eyeglasses, without retraining the GAN model. Furthermore, we show that even the artifacts occurred in output images are able to be fixed using same approach. Extensive results suggest that learning to synthesize faces spontaneously brings a disentangled and controllable facial attribute representation

本文提出了一个名为InterFaceGAN的新框架,用于解释GAN学习到的语义面部编辑,并深入研究不同语义如何编码在GAN的潜在空间中。我们发现，精心训练的生成模型的潜在编码实际上学习了一个分离的表示，在线性变换后解旋，通过子空间投影来解开某些绑定属性，实现更精确的面部特征控制，并产生可控的面部属性表示的结果表明GAN具有生成高保真图像的能力。

基于GAN的潜空间在人脸语义编辑中的应用解释