Diffusion models have become a new generative paradigm for text generation. Considering the discrete categorical nature of text, in this paper, we propose \textsc{RenderDiffusion}, a novel diffusion approach for text generation via text-guided image generation. Our key idea is to render the target text as a \emph{glyph image} containing visual language content. In this way, conditional text generation can be cast as a glyph image generation task, and it is then natural to apply continuous diffusion models to discrete texts. Specially, we utilize a cascaded architecture (\ie a base and a super-resolution diffusion model) to generate high-fidelity glyph images, conditioned on the input text. Furthermore, we design a text grounding module to transform and refine the visual language content from generated glyph images into the final texts. In experiments over four conditional text generation tasks and two classes of metrics (\ie quality and diversity), \textsc{RenderDiffusion} can achieve comparable or even better results than several baselines, including pretrained language models. Our model also makes significant improvements compared to the recent diffusion model.

本篇论文提出了一种新的基于扩散模型的文本生成方法——	extsc{RenderDiffusion}，它通过渲染目标文本为包含可视化语言内容的图形图像进行条件文本生成。该方法在四个条件文本生成任务和两类度量中都取得了比预训练语言模型更好的结果。

RenderDiffusion: 将文本生成作为图像生成