1 ã¯ããã« æè¿ãæã +æ°åã§ã¹ãã¼ã¹ã¢ããªã³ã°ã¨ããåéãåå¼·ãã¦ãã¾ãã詳細ã¯ã¾ãå¥ã®è¨äºã«ã¦ç´¹ä»ããã«ãã¦ãä»åã¯ã¹ãã¼ã¹ã¢ããªã³ã°ã®å段éã«å½ãã ãªãã¸å帰(ridge regresion) ã«èå ãå½ã¦ã¾ã1ã èªè ã«ã¯é迦ã«èª¬æ³ããããã¾ãããããªãã¸å帰㯠L2 æ£ååã¨ãå¼ã°ãæ©æ¢°å¦ç¿ã®ä¸ã§ãé常ã«ã¹ã¿ã³ãã¼ããªæ¦å¿µã®ä¸ã¤ã«ãªã£ã¦ãã¾ãããããå°éçã«æ£ååæ³ãæ±ã£ã¦ã¿ã¦ãæ¡å¤ç¥ããªãã£ããã¨ãç¥ããã®ã§ã¾ã¨ãã¾ããã ã¾ãããªãã¸å帰ã§ã®æ失é¢æ°ã¯ä»¥ä¸ã®ãããªå¼ã§è¨è¿°ããã¾ãã \begin{align} E = (y - X \vec{w})^2 + \alpha \vec{w}^T \vec{w} \end{align} ä¸è¨ã®æ失ãæå°åããããã«ä¿æ°ã®éã¿ãã¯ãã« \(\vec{w}\) ãæ¨å®ãã¾ãã解æçã«ã¯ \(\vec{w}\) ã«ã¤ãã¦å¾®åããããã®
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