Existing deepfake detection methods fail to generalize well to unseen or degraded samples, which can be attributed to the over-fitting of low-level forgery patterns. Here we argue that high-level semantics are also indispensable recipes for generalizable forgery detection. Recently, large pre-trained Vision Transformers (ViTs) have shown promising generalization capability. In this paper, we propose the first parameter-efficient tuning approach for deepfake detection, namely DeepFake-Adapter, to effectively and efficiently adapt the generalizable high-level semantics from large pre-trained ViTs to aid deepfake detection. Given large pre-trained models but limited deepfake data, DeepFake-Adapter introduces lightweight yet dedicated dual-level adapter modules to a ViT while keeping the model backbone frozen. Specifically, to guide the adaptation process to be aware of both global and local forgery cues of deepfake data, 1) we not only insert Globally-aware Bottleneck Adapters in parallel to MLP layers of ViT, 2) but also actively cross-attend Locally-aware Spatial Adapters with features from ViT. Unlike existing deepfake detection methods merely focusing on low-level forgery patterns, the forgery detection process of our model can be regularized by generalizable high-level semantics from a pre-trained ViT and adapted by global and local low-level forgeries of deepfake data. Extensive experiments on several standard deepfake detection benchmarks validate the effectiveness of our approach. Notably, DeepFake-Adapter demonstrates a convincing advantage under cross-dataset and cross-manipulation settings. The source code is released at https://github.com/rshaojimmy/DeepFake-Adapter

本文提出了第一种参数高效调节 deepfake 检测模型的方法 DeepFake-Adapter，该方法采用适配器模块从大型预训练 Vision Transformers 中提取高级语义，以有效且高效地帮助 deepfake 检测。通过在 MLP 层旁插入具有全局感知的 Englobed Adapters 和跨越 ViT 特征的局部感知的空间 Adapter，该方法可以将先前训练好的 Vision Transformers 的高级语义与本地和全局低级别伪造的 deepfake 数据的降噪信息相结合，从而提高 deepfake 的准确度和泛化能力。

DeepFake-Adapter: 深度伪造检测的双层适配器