發送短信

數:

提供者:

CAPTCHA:

   _____    ______               ___              
  / ___//  /_   _//   ____      / _ \\      ___   
  \___ \\   -| ||-   |    \\   | / \ ||    /   || 
  /    //   _| ||_   | [] ||   | \_/ ||   | [] || 
 /____//   /_____//  |  __//    \___//     \__ || 
`-----`    `-----`   |_|`-`     `---`       -|_|| 
                     `-`                     `-`

Please enter what you see:

發送短信 : AVA: Adversarial Vignetting Attack against visual recognition