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Hi, Thanks for your interest in our work. We use args.sigma*2 because the image we loaded is in range of [-1,1]. Thus the corresponding sigma (for image with pixel range [0,1]) needs to be multiplied by 2 to match the normalized images.
In the original randomized smoothing paper, the certified radius proposed in equation 3 use just sigma. I don't know where you get the impression that sigma**2 is needed, can you point me to a reference?
Hello! Can you explain why you set target_sigma = args.sigma*2 (multiply 2)?
In my opinion, target_sigma = args.sigma**2 (power 2) is correct.
Thank you!
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