Text-to-image diffusion models have demonstrated an unparalleled ability to
generate high-quality, diverse images from a textual concept (e.g., "a doctor",
"love"). However, the internal process of mapping text to a rich visual
representation remains an enigma. In this work, we tackle the challenge of
understanding concept representations in text-to-image models by decomposing an
input text prompt into a small set of interpretable elements. This is achieved
by learning a pseudo-token that is a sparse weighted combination of tokens from
the model's vocabulary, with the objective of reconstructing the images
generated for the given concept. Applied over the state-of-the-art Stable
Diffusion model, this decomposition reveals non-trivial and surprising
structures in the representations of concepts. For example, we find that some
concepts such as "a president" or "a composer" are dominated by specific
instances (e.g., "Obama", "Biden") and their interpolations. Other concepts,
such as "happiness" combine associated terms that can be concrete ("family",
"laughter") or abstract ("friendship", "emotion"). In addition to peering into
the inner workings of Stable Diffusion, our method also enables applications
such as single-image decomposition to tokens, bias detection and mitigation,
and semantic image manipulation. Our code will be available at:
this https URL

本文针对文本到图像模型中的特征表征进行了分解，通过学习一个假的标记，将输入文本提示分解为一小组可解释元素，对现有良好的稳定扩散模型进行了应用，我们发现某些概念由特定实例主导，而其他概念则结合具体和抽象的关联术语，此外，我们的方法还可以实现单幅图像分解、偏置检测和缓解以及语义图像操作。