{"id":325,"date":"2019-03-16T15:31:05","date_gmt":"2019-03-16T07:31:05","guid":{"rendered":"http:\/\/47.101.202.111\/?p=325"},"modified":"2023-04-07T11:43:10","modified_gmt":"2023-04-07T03:43:10","slug":"%e6%9c%ba%e5%99%a8%e5%ad%a6%e4%b9%a0%e5%9f%ba%e6%9c%ac%e6%9c%af%e8%af%ad%e4%b8%8e%e9%a1%b6%e5%88%8a%e4%bc%9a%e8%ae%ae","status":"publish","type":"post","link":"http:\/\/139.196.114.170\/?p=325","title":{"rendered":"\u8ba9\u6587\u5b57\u53ef\u88ab\u8ba1\u7b97 – \u6d45\u8c08\u6587\u672c\u8868\u793a\u65b9\u6cd5"},"content":{"rendered":"

\u6587\u5b57\u662f\u4e00\u4e2a\u7b26\u53f7\u7cfb\u7edf\uff0c\u8981\u5bfb\u627e\u8fd9\u4e9b\u7b26\u53f7\u4e4b\u95f4\u7684\u5173\u7cfb\u3001\u7b26\u53f7\u4e0d\u540c\u987a\u5e8f\u7ec4\u5408\u7684\u89c4\u5f8b\uff0c\u5c31\u5fc5\u987b\u5c06\u5176\u7528\u6570\u5b66\u5f62\u5f0f\u8868\u793a\uff0c\u8fdb\u800c\u4f7f\u5f97\u6587\u5b57\u53ef\u88ab\u8ba1\u7b97<\/p>\n

<\/p>\n

\u8bcd\u888b\u6a21\u578b\uff08BOW, Bag-of-words\uff09<\/h3>\n

\u672c\u8d28\u662f\u7528\u6570\u5b66\u5f62\u5f0f\u6765\u63cf\u8ff0\u8bcd\u6c47\u7684 \u51fa\u73b0\u60c5\u51b5<\/strong>\uff0c\u57fa\u672c\u601d\u60f3\u662f\u6839\u636e\u8bad\u7ec3\u5185\u5bb9\u5c06\u6240\u6709\u7684\u8bcd\u6c47\u7eb3\u5165\u4e00\u4e2a\u8bcd\u6c47\u8868\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u7528\u5411\u91cf\u6765\u8868\u793a\u6587\u5b57\u5e8f\u5217\uff1a\u5411\u91cf\u4e2d\u6bcf\u4e00\u7ef4\u90fd\u5bf9\u5e94\u8bcd\u6c47\u8868\u7684\u540c\u4f4d\u7f6e\u8bcd\u6c47\u3002\u7f3a\u70b9\u662f\u6ca1\u6709\u5c06\u8bcd\u6c47\u4e4b\u95f4\u7684\u5173\u8054\u3001\u8bcd\u6c47\u7684\u987a\u5e8f\u3001\u8bcd\u6c47\u7684\u8bed\u4e49\u4fe1\u606f\u8868\u793a\u51fa\u6765\u3002\u53e6\u4e00\u4e2a\u68d8\u624b\u7684\u95ee\u9898\u662f\u6536\u5f55\u8bcd\u6c47\u8f83\u591a\u65f6\uff0c\u77ed\u6587\u672c\u5bf9\u5e94\u8bcd\u6c47\u592a\u5c11\u53d60\u8fc7\u591a\uff0c\u9020\u6210\u4e0d\u5fc5\u8981\u7684\u7a7a\u95f4\u6d6a\u8d39\u548c\u8ba1\u7b97\u6210\u672c\u6d6a\u8d39<\/p>\n

\u8bcd\u888b\u6a21\u578b\u6839\u636e\u7ef4\u5ea6\u4e0a\u53d6\u503c\u7684\u4e0d\u540c\u53ef\u5206\u4e3a\u4ee5\u4e0b\u51e0\u79cd\u5f62\u5f0f<\/p>\n

One-Hot<\/h4>\n

\u5bf9\u8bcd\u6c47 \u51fa\u73b0\u4e0e\u5426<\/strong> \u8fdb\u884c\u6570\u5b66\u5efa\u6a21\uff1a\u7ef4\u5ea6\u53d6\u503c\u89c4\u5219\u4e3a\u51fa\u73b0\u8ba11\u5426\u5219\u4e3a0<\/p>\n

\u7ed9\u5b9a\u8bcd\u6c47\u8868\u4e3a \\scriptsize [\"\u4eca\u5929\",\"\u4f60\",\"\u662f\",\"\u4eba\",\"\u6211\",\"\u559c\u6b22\"]<\/code>
\n"\u6211\u559c\u6b22\u4f60"\u8fd9\u53e5\u8bdd\u53ef\u8868\u793a\u4e3a\u5411\u91cf \\scriptsize [0,1,0,0,1,1]<\/code><\/p>\n

Frequency<\/h4>\n

\u5bf9\u8bcd\u6c47\u7684 \u51fa\u73b0\u6b21\u6570<\/strong> \u8fdb\u884c\u6570\u5b66\u5efa\u6a21\uff1a\u7ef4\u5ea6\u53d6\u503c\u4e3a\u51fa\u73b0\u9891\u6570
\n\u7ed9\u5b9a\u8bcd\u6c47\u8868\u4e3a \\scriptsize [\"\u4eca\u5929\",\"\u4f60\",\"\u662f\",\"\u4eba\",\"\u6211\",\"\u559c\u6b22\"]<\/code>
\n"\u4f60\u77e5\u4e0d\u77e5\u9053\u4f60\u662f\u6211\u559c\u6b22\u7684\u4eba"\u53ef\u8868\u793a\u4e3a \\scriptsize [0,2,1,1,1,1]<\/code><\/p>\n

TF-IDF<\/h4>\n

\u5bf9\u8bcd\u6c47\u7684 \u91cd\u8981\u7a0b\u5ea6<\/strong> \u8fdb\u884c\u6570\u5b66\u5efa\u6a21\uff1a\u7ef4\u5ea6\u53d6\u503c\u4e3aTF-IDF\u503c<\/p>\n

TF-IDF\u503c\u901a\u5e38\u7528\u4e8e\u8861\u91cf\u4e00\u4e2a\u8bcd\u6c47\u5bf9\u4e00\u7bc7\u6587\u6863\u7684\u91cd\u8981\u6027\uff1a\u5176\u57fa\u672c\u601d\u60f3\u662f\u5982\u679c\u4e00\u4e2a\u8bcd\u6c47\u5728\u4e00\u7c7b\u6587\u7ae0\u4e2d\u7684\u51fa\u73b0\u6b21\u6570\u5f88\u9ad8\uff0c\u800c\u5728\u5176\u4ed6\u6587\u7ae0\u4e2d\u7684\u51fa\u73b0\u6b21\u6570\u5f88\u5c11\uff0c\u800c\u8fd9\u4e2a\u8bcd\u6c47\u53c8\u5728\u4e00\u7bc7\u6587\u6863\u4e2d\u9891\u7e41\u51fa\u73b0\uff0c\u90a3\u4e48\u8fd9\u4e2a\u8bcd\u6c47\u5bf9\u533a\u5206\u8fd9\u7bc7\u6587\u7ae0\u548c\u5176\u4ed6\u6587\u7ae0\u5c31\u6709\u5f88\u5927\u7684\u8d21\u732e<\/p>\n

\\tiny\n\u7ed9\u5b9a\u8bcd\u6c47w\uff0c\u4e00\u7bc7\u6587\u6863d\uff0cw\u51fa\u73b0\u8fc7\u7684\u6587\u6863\u96c6D_w\uff0c\u603b\u6587\u6863\u96c6D\\\\\nTF=\\frac{wordCount(w)}{wordCount(d)}\uff0c\u8ba1\u7b97\u8bcd\u6c47w\u5728\u4e00\u7bc7\u6587\u6863d\u4e2d\u7684\u51fa\u73b0\u9891\u7387\\\\\nIDF=\\log \\frac{documentCount(D)}{documentCount(D_w)}\uff0c\u8ba1\u7b97\u8bcd\u6c47w\u5bf9\u6587\u6863\u7684\u533a\u5206\u5ea6\\\\\nTF-IDF = TF * IDF<\/code><\/pre>\n
N-Gram<\/h3>\n
\u672c\u8d28\u662f\u7528\u6570\u5b66\u5f62\u5f0f\u6765\u63cf\u8ff0\u76f8\u90bb\u8bcd\u6c47\u4e4b\u95f4\u7684\u8054\u7cfb<\/p>\n
\u8bcd\u5411\u91cf<\/h3>\n
\u672c\u8d28\u662f\u7528\u6570\u5b66\u5f62\u5f0f\u8868\u793a\u8bcd\u6c47\u6240\u5904\u8bed\u5883\u4e2d\u7684\u8bed\u4e49\u4fe1\u606f<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u5b57\u662f\u4e00\u4e2a\u7b26\u53f7\u7cfb\u7edf\uff0c\u8981\u5bfb\u627e\u8fd9\u4e9b\u7b26\u53f7\u4e4b\u95f4\u7684\u5173\u7cfb\u3001\u7b26\u53f7\u4e0d\u540c\u987a\u5e8f\u7ec4\u5408\u7684\u89c4\u5f8b\uff0c\u5c31\u5fc5\u987b\u5c06\u5176\u7528\u6570\u5b66\u5f62\u5f0f\u8868\u793a\uff0c\u8fdb\u800c\u4f7f\u5f97\u6587\u5b57\u53ef … <\/p>\n
\u7ee7\u7eed\u9605\u8bfb\u201c\u8ba9\u6587\u5b57\u53ef\u88ab\u8ba1\u7b97 – \u6d45\u8c08\u6587\u672c\u8868\u793a\u65b9\u6cd5\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts\/325"}],"collection":[{"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=325"}],"version-history":[{"count":3,"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts\/325\/revisions"}],"predecessor-version":[{"id":2732,"href":"http:\/\/139.196.114.170\/index.php?rest_route=\/wp\/v2\/posts\/325\/revisions\/2732"}],"wp:attachment":[{"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=325"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/139.196.114.170\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}