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README.md

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-The pre-trained adversarial surrogate detectors used in the paper [Benchmarking the Robustness of Image Watermarks](https://arxiv.org/abs/2401.08573). 
+Nine checkpoints of the pre-trained adversarial surrogate detectors used in the paper [Benchmarking the Robustness of Image Watermarks](https://arxiv.org/abs/2401.08573). 
 Please refer to our [github repo](https://github.com/umd-huang-lab/WAVES) for the use.