“`” \u53c2\u8003\u56de\u7b54\uff1a<\/p>\n
\u8bcd\u5411\u91cf\u5176\u5b9e\u662f\u5c06\u8bcd\u6620\u5c04\u5230\u4e00\u4e2a\u8bed\u4e49\u7a7a\u95f4\uff0c\u5f97\u5230\u7684\u5411\u91cf\u3002\u800cword2vec\u662f\u501f\u7528\u795e\u7ecf\u7f51\u7edc\u7684\u65b9\u5f0f\u5b9e\u73b0\u7684\uff0c\u8003\u8651\u6587\u672c\u7684\u4e0a\u4e0b\u6587\u5173\u7cfb\uff0c\u6709\u4e24\u79cd\u6a21\u578bCBOW\u548cSkip-gram\uff0c\u8fd9\u4e24\u79cd\u6a21\u578b\u5728\u8bad\u7ec3\u7684\u8fc7\u7a0b\u4e2d\u7c7b\u4f3c\u3002Skip-gram\u6a21\u578b\u662f\u7528\u4e00\u4e2a\u8bcd\u8bed\u4f5c\u4e3a\u8f93\u5165\uff0c\u6765\u9884\u6d4b\u5b83\u5468\u56f4\u7684\u4e0a\u4e0b\u6587\uff0cCBOW\u6a21\u578b\u662f\u62ff\u4e00\u4e2a\u8bcd\u8bed\u7684\u4e0a\u4e0b\u6587\u4f5c\u4e3a\u8f93\u5165\uff0c\u6765\u9884\u6d4b\u8fd9\u4e2a\u8bcd\u8bed\u672c\u8eab\u3002<\/p>\n
\u8bcd\u5411\u91cf\u8bad\u7ec3\u7684\u9884\u5904\u7406\u6b65\u9aa4\uff1a<\/p>\n
1.\u5bf9\u8f93\u5165\u7684\u6587\u672c\u751f\u6210\u4e00\u4e2a\u8bcd\u6c47\u8868\uff0c\u6bcf\u4e2a\u8bcd\u7edf\u8ba1\u8bcd\u9891\uff0c\u6309\u7167\u8bcd\u9891\u4ece\u9ad8\u5230\u4f4e\u6392\u5e8f\uff0c\u53d6\u6700\u9891\u7e41\u7684V\u4e2a\u8bcd\uff0c\u6784\u6210\u4e00\u4e2a\u8bcd\u6c47\u8868\u3002\u6bcf\u4e2a\u8bcd\u5b58\u5728\u4e00\u4e2aone-hot\u5411\u91cf\uff0c\u5411\u91cf\u7684\u7ef4\u5ea6\u662fV\uff0c\u5982\u679c\u8be5\u8bcd\u5728\u8bcd\u6c47\u8868\u4e2d\u51fa\u73b0\u8fc7\uff0c\u5219\u5411\u91cf\u4e2d\u8bcd\u6c47\u8868\u4e2d\u5bf9\u5e94\u7684\u4f4d\u7f6e\u4e3a1\uff0c\u5176\u4ed6\u4f4d\u7f6e\u5168\u4e3a0\u3002\u5982\u679c\u8bcd\u6c47\u8868\u4e2d\u4e0d\u51fa\u73b0\uff0c\u5219\u5411\u91cf\u4e3a\u51680<\/p>\n
2.\u5c06\u8f93\u5165\u6587\u672c\u7684\u6bcf\u4e2a\u8bcd\u90fd\u751f\u6210\u4e00\u4e2aone-hot\u5411\u91cf\uff0c\u6b64\u5904\u6ce8\u610f\u4fdd\u7559\u6bcf\u4e2a\u8bcd\u7684\u539f\u59cb\u4f4d\u7f6e\uff0c\u56e0\u4e3a\u662f\u4e0a\u4e0b\u6587\u76f8\u5173\u7684<\/p>\n
3.\u786e\u5b9a\u8bcd\u5411\u91cf\u7684\u7ef4\u6570N<\/p>\n
Skip-gram\u5904\u7406\u6b65\u9aa4\uff1a<\/p>\n
1.\u786e\u5b9a\u7a97\u53e3\u5927\u5c0fwindow\uff0c\u5bf9\u6bcf\u4e2a\u8bcd\u751f\u62102*window\u4e2a\u8bad\u7ec3\u6837\u672c\uff0c(i, i-window)\uff0c(i, i-window+1)\uff0c…\uff0c(i, i+window-1)\uff0c(i, i+window)<\/p>\n
2.\u786e\u5b9abatch_size\uff0c\u6ce8\u610fbatch_size\u7684\u5927\u5c0f\u5fc5\u987b\u662f2*window\u7684\u6574\u6570\u500d\uff0c\u8fd9\u786e\u4fdd\u6bcf\u4e2abatch\u5305\u542b\u4e86\u4e00\u4e2a\u8bcd\u6c47\u5bf9\u5e94\u7684\u6240\u6709\u6837\u672c<\/p>\n
3.\u8bad\u7ec3\u7b97\u6cd5\u6709\u4e24\u79cd\uff1a\u5c42\u6b21Softmax\u548cNegative Sampling<\/p>\n
4.\u795e\u7ecf\u7f51\u7edc\u8fed\u4ee3\u8bad\u7ec3\u4e00\u5b9a\u6b21\u6570\uff0c\u5f97\u5230\u8f93\u5165\u5c42\u5230\u9690\u85cf\u5c42\u7684\u53c2\u6570\u77e9\u9635\uff0c\u77e9\u9635\u4e2d\u6bcf\u4e00\u884c\u7684\u8f6c\u7f6e\u5373\u662f\u5bf9\u5e94\u8bcd\u7684\u8bcd\u5411\u91cf<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/uploadfiles.nowcoder.com\/images\/20190318\/311436_1552911465006_431DE2BC26D651525012526447CDCBE5""><\/p>\n
CBOW\u7684\u5904\u7406\u6b65\u9aa4\uff1a<\/p>\n
1.\u786e\u5b9a\u7a97\u53e3\u5927\u5c0fwindow\uff0c\u5bf9\u6bcf\u4e2a\u8bcd\u751f\u62102*window\u4e2a\u8bad\u7ec3\u6837\u672c\uff0c(i-window, i)\uff0c(i-window+1, i)\uff0c…\uff0c(i+window-1, i)\uff0c(i+window, i)<\/p>\n
2.\u786e\u5b9abatch_size\uff0c\u6ce8\u610fbatch_size\u7684\u5927\u5c0f\u5fc5\u987b\u662f2*window\u7684\u6574\u6570\u500d\uff0c\u8fd9\u786e\u4fdd\u6bcf\u4e2abatch\u5305\u542b\u4e86\u4e00\u4e2a\u8bcd\u6c47\u5bf9\u5e94\u7684\u6240\u6709\u6837\u672c<\/p>\n
3.\u8bad\u7ec3\u7b97\u6cd5\u6709\u4e24\u79cd\uff1a\u5c42\u6b21Softmax\u548cNegative Sampling<\/p>\n
4.\u795e\u7ecf\u7f51\u7edc\u8fed\u4ee3\u8bad\u7ec3\u4e00\u5b9a\u6b21\u6570\uff0c\u5f97\u5230\u8f93\u5165\u5c42\u5230\u9690\u85cf\u5c42\u7684\u53c2\u6570\u77e9\u9635\uff0c\u77e9\u9635\u4e2d\u6bcf\u4e00\u884c\u7684\u8f6c\u7f6e\u5373\u662f\u5bf9\u5e94\u8bcd\u7684\u8bcd\u5411\u91cf<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/uploadfiles.nowcoder.com\/images\/20190318\/311436_1552911440225_8CC56AE3586EFD495C70745D5E7A5B0A""><\/p>\n
\u53c2\u6570\u77e9\u9635\u89e3\u91ca\uff1a<\/p>\n
\u5bf9\u8f93\u5165\u5c42\u5230\u9690\u85cf\u5c42\u7684\u53c2\u6570\u5305\u542bW\u548cb\uff0c\u6211\u4eec\u9700\u8981\u7684\u662fW\uff0c\u8fd9\u91cc\u7684W\u662f\u4e00\u4e2a\u77e9\u9635\uff0cshape=(N,V)\u3002\u5176\u4e2dV\u662f\u4e0a\u6587\u6240\u8ff0\u7684\u8bcd\u8868\u7684\u5927\u5c0f\uff0cN\u662f\u9700\u8981\u751f\u6210\u7684\u8bcd\u5411\u91cf\u7684\u7ef4\u6570\u3002N\u540c\u6837\u4e5f\u662f\u9690\u85cf\u5c42\uff08\u7b2c\u4e00\u5c42\uff09\u4e2d\u7684\u9690\u85cf\u8282\u70b9\u4e2a\u6570\u3002<\/p>\n
\u6bcf\u6b21\u4e00\u4e2abatch_size\u8f93\u5165\u5176\u5b9e\u4e00\u4e2a\u77e9\u9635(batch_size, V)\uff0c\u8bb0\u4e3aX\uff0c\u9690\u85cf\u5c42\u8f93\u51fa\u4e3aY\uff0c\u516c\u5f0f\u4e3a<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/uploadfiles.nowcoder.com\/images\/20190318\/311436_1552911565798_04E861EBB1A1C5A8143A01A9E72E9AAE"">\u3002\u6240\u6709\u7684\u8f93\u5165\u5171\u4eab\u4e00\u4e2aW\uff0c\u6bcf\u6b21\u8fed\u4ee3\u7684\u65f6\u5019\u90fd\u5728\u4fee\u6539W\uff0c\u7531\u4e8eone-hot\u7684\u6027\u8d28\uff0c\u6bcf\u6b21\u4fee\u6539W\u53ea\u4fee\u65391\u5bf9\u5e94\u7684\u90a3\u4e00\u884c\u3002\u800c\u8fd9\u4e00\u884c\u4e5f\u5c31\u662f\u8bcd\u5411\u91cf\uff08\u8f6c\u7f6e\u540e\uff09<\/p>\n
\u795e\u7ecf\u7f51\u7edc\u50cf\u662f\u4e00\u4e2a\u9ed1\u76d2\u5b50\uff0c\u8fd9\u5176\u4e2d\u7684\u6982\u5ff5\u5f88\u96be\u7406\u89e3\uff0c\u8fd9\u91cc\u7ed9\u51fa\u6211\u5bf9\u8bcd\u5411\u91cf\u8bad\u7ec3\u7684\u4e2a\u4eba\u7406\u89e3\uff1a\u5bf9\u4e8e\u6bcf\u4e2a\u8bcds\uff0c\u8bad\u7ec3\u6570\u636e\u5bf9\u5e94\u7684\u6807\u8bb0\u662f\u53e6\u4e00\u4e2a\u8bcdt\uff0c\u8bad\u7ec3\u5176\u5b9e\u662f\u60f3\u627e\u5230\u4e00\u79cd\u6620\u5c04\u5173\u7cfb\uff0c\u8ba9s\u6620\u5c04\u5230t\u3002\u4f46\u5f88\u663e\u7136\u6211\u4eec\u4e0d\u662f\u5e0c\u671b\u627e\u5230\u4e00\u4e2a\u7ebf\u6027\u51fd\u6570\uff0c\u4f7f\u5f97\u7ed9\u5b9as\u4e00\u5b9a\u80fd\u5f97\u5230t\uff0c\u6211\u4eec\u5e0c\u671b\u7684\u662f\u80fd\u591f\u901a\u8fc7s\u5f97\u5230\u4e00\u7c7b\u8bcdT\uff0c\u5305\u542bt\u3002\u5bf9\u4e8eT\u4e2d\u7684\u6bcf\u4e2at\uff0c\u7531\u4e8e\u5728s\u4e0a\u4e0b\u6587\u4e2d\u51fa\u73b0\u7684\u9891\u6b21\u4e0d\u540c\uff0c\u81ea\u7136\u80fd\u5f97\u5230\u4e00\u4e2a\u6982\u7387\uff0c\u9891\u6b21\u8d8a\u9ad8\u8bf4\u660es\u4e0et\u76f8\u5173\u6027\u8d8a\u9ad8\u3002<\/p>\n
\u5bf9\u4e8e\u8bcd\u5411\u91cf\uff0c\u6216\u8005\u8bf4\u53c2\u6570\u77e9\u9635W\uff0c\u53ef\u4ee5\u8ba4\u4e3a\u662f\u4e00\u4e2a\u5c06\u8bcd\u6620\u5c04\u5230\u8bed\u4e49\u7a7a\u95f4\u7684\u6865\u6881\uff0cs\u4e0et\u76f8\u5173\u6027\u8d8a\u9ad8\uff0c\u5219\u8ba4\u4e3a\u5176\u5728\u8bed\u4e49\u7a7a\u95f4\u4e2d\u8d8a\u8fd1\uff0c\u90a3\u4e48\u5bf9\u5e94\u7684\u6865\u6881\u4e5f\u8d8a\u9760\u8fd1\u3002\u5982\u679c\u7528\u5411\u91cf\u6765\u7406\u89e3\u7684\u8bdd\u5c31\u662f\u5411\u91cf\u4e4b\u524d\u7684\u5939\u89d2\u8d8a\u5c0f\uff0c\u6211\u4eec\u4f7f\u7528\u5411\u91cf\u6765\u8868\u793a\u8fd9\u4e2a\u8bcd\u7684\u4fe1\u606f\uff0c\u91cd\u8981\u7684\u662f\u5f97\u5230\u4e86\u8bed\u4e49\u4fe1\u606f\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u751f\u6210\u4e00\u6bb5\u6587\u672c\uff0c\u6211\u4eec\u53ef\u4ee5\u5224\u65ad\u8bcd\u4e0e\u8bcd\u7684\u5411\u91cf\u4e4b\u95f4\u76f8\u4f3c\u5ea6\uff0c\u5982\u679c\u8fc7\u4f4e\u5219\u5c31\u9700\u8981\u6000\u7591\u662f\u5426\u6b63\u786e\u4e86\u3002<\/p>\n
<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
“`” \u53c2\u8003\u56de\u7b54\uff1a \u8bcd\u5411\u91cf\u5176\u5b9e\u662f\u5c06\u8bcd\u6620\u5c04\u5230\u4e00\u4e2a\u8bed\u4e49\u7a7a\u95f4\uff0c\u5f97\u5230\u7684\u5411\u91cf\u3002\u800cword2vec […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-45560","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/45560","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=45560"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/45560\/revisions"}],"predecessor-version":[{"id":45561,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/45560\/revisions\/45561"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=45560"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=45560"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=45560"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}