[english][all] (½Ðª`·N¡G¤¤¤åª©¥»¨Ã¥¼ÀH^¤åª©¥»¦P¨B§ó·s¡I)
¾Ç²ß¦¡¦V¶q¶q¤Æ¡]learning vector quantization¡^²ºÙ LVQ¡A¦¹¤èªk¬O³z¹L¦Û°Ê¾Ç²ßªººt¶i¹Lµ{¡A¶i¦æ§Y®Éªº·L½Õ¡A¨Ï¦UÓÃþ§Oªº¥NªíÂIÁͪñ³Ì¨ÎÈ¡A¥i»¡©ú¦p¤U¡G
¨ä¤¤¡A£\ ¬O¤@ÓÀHÅ|¥N¦¸¼Æ¦Ó»¼´î¨ç¼Æ¡A¦Ó¥B0 < £\ < 1¡C
- ³]©w¨C¤@ÓÃþ§Oªº¥NªíÂI¡C°²³]¦@¦³¥|ÓÃþ§O¡A¨C¤@ÓÃþ§O¦³¤TÓ¥NªíÂI¡A¨º´N¦@¦³ 12 Ó¥NªíÂI¡C¨CÓÃþ§Oªº¥NªíÂI¡A¥i¥Ñ¦¹Ãþ§Oªº¸ê®Æ¨Ó¶i¦æ k-means ¤À¸sªk¦Ó±o¨ì¡A³o¤è±¬O©M VQ §¹¥þ¬Û¦P¡C¡]¦pªG¨CÓÃþ§O¸ê®ÆӼƮt¶Z«Ü¤j¡A¤]¥i¥HÅý¨ã¦³¤j¶q¸ê®ÆªºÃþ§O¦³¸û¦hªº¥NªíÂI¡C¡^
- ¹ï¨C¤@Ó¸ê®ÆÂI x¡A´M§ä³Ì±µªñªº¥NªíÂI¡A°²³]¬O yk
- ¤ñ¸û x ©M yk ªºÃþ§O¡A¶i¦æ¤U¦C³B²z¡G
- YÃþ§O¬Û¦P¡A«h±N yk ´Â x ªº¤è¦V©Ôªñ¡G
yk = yk + £\ [x - yk] - YÃþ§O¤£¦P¡A«h±N yi ´Â x ªº¤Ï¤è¦V©Ô»·¡G
yk = yk - £\ [x - yk] - ¦^¨ì¨BÆJ¤G¡A¤ÏÂйï©Ò¦³¸ê®ÆÂI¶i¦æ¹Bºâ¨Ã·L½Õ¥NªíÂI¡Aª½¨ì¥NªíÂI¤£¦AÅܤơC
¤WzÅ|¥N¤èªk¦¬ÀÄ«á¡A§Ú̧Y¥i¥H¨Ï¥Î¨CÓÃþ§Oªº¥NªíÂI¨Ó¥Nªí³o¤@Ãþªº¸ê®Æ¤À§G¡C¹J¨ì¥¼ª¾Ãþ§Oªº·s¸ê®Æ¡A§ÚÌ¥u»Ý¥H³Ìªñ¾F©~ªk«h¡A§ä¥X³Ìªñªº¥NªíÂI¡A§Y¥i§P©w¸Ó¸ê®ÆªºÃþ§O¡C
LVQ ªº¤èªk©M VQ «Ü±µªñ¡A¦ý¤£¦Pªº¬O¡G
- VQ ¬O¥Î¦b¸ê®ÆªºÀ£ÁY»P¨ú½s½X¦V¶q¡A¾A¥Î©óµLÃþ§O¸ê°Tªº¸ê®Æ¡C
- LVQ ªº¥Ø¼Ð¦A§ä¥X¦P¤@ÓÃþ§O¸ê®Æªº¥NªíÂI¡A¦A¥H¥NªíÂI¨Ó¶i¦æ¤ÀÃþ¡A¦]¦¹¾A¥Î©ó¤ÀÃþ°ÝÃD¡C
References:
- T. Kohonen, "Improved Versions of Learning Vector Quantization", International Joint Conference on Neural Networks (IJCNN), 1990.
Data Clustering and Pattern Recognition (¸ê®Æ¤À¸s»P¼Ë¦¡¿ë»{)