發送短信 : A robust and globally convergent PCA learning algorithm

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