網(wǎng)絡(luò)信息挖掘技術(shù)可以提高搜索引擎獲取信息的準(zhǔn)確性，并可以對(duì)用戶搜索結(jié)果進(jìn)行相關(guān)處理，提高查準(zhǔn)率和查全率。網(wǎng)絡(luò)信息挖掘技術(shù)在搜索引擎中的應(yīng)用包括：
(1)文檔的自動(dòng)分類。Web頁面與一般的純文本文件不同，它是HTML格式的超文本，頁面中有
<meta>等標(biāo)記，以及描述頁面的標(biāo)題、關(guān)鍵詞及URL等，這些都包含了重要的分類信息。通過網(wǎng)絡(luò)信息挖掘和機(jī)器學(xué)習(xí)技術(shù)可以對(duì)索引數(shù)據(jù)庫中的信息進(jìn)行整理，對(duì)文檔自動(dòng)分類，從而提高用戶的檢索速度和檢索的精度。由于采用了機(jī)器自動(dòng)分類的方法，克服了人工分類中信息檢索不全面、更新速度慢的缺點(diǎn)。
</p>
<p>
(2)自動(dòng)文摘的形成。搜索引擎向用戶返回檢索結(jié)果時(shí)，通常要給出每個(gè)文檔的簡(jiǎn)單摘要，目前，大部分搜索引擎是機(jī)械地截取文檔的前幾句。而通過Web文本挖掘中的文本總結(jié)技術(shù)，可以從Web頁面中提煉出重要的信息，形成文檔摘要，使用戶能較全面地了解文檔的內(nèi)容。
</p>
<p>
(3)檢索結(jié)果的聚類。搜索引擎的檢索結(jié)果常包含大量信息，且其中大部分是與檢索無關(guān)的信息。我們可以通過網(wǎng)絡(luò)信息挖掘技術(shù)對(duì)檢索結(jié)果的文檔進(jìn)行聚類，把結(jié)果信息用超鏈接方法以可視化方式提供給用戶，由用戶選擇自己感興趣的一簇，將大大減少瀏覽的頁面數(shù)量。
</p>
<p>
(4)查詢結(jié)果的相關(guān)度排序。Web頁面中包含了許多超鏈接，有指向其他網(wǎng)頁的，也有其他網(wǎng)頁指向本網(wǎng)頁的。因此，指向該網(wǎng)頁的鏈接體現(xiàn)了該網(wǎng)頁的引用情況?？捎镁W(wǎng)絡(luò)信息挖掘技術(shù)對(duì)網(wǎng)頁引用的頻率統(tǒng)計(jì)確定它的重要性和相關(guān)性，從而有助于對(duì)搜索引擎返回結(jié)果進(jìn)行相關(guān)度排序。
</p>
<p>
(5)實(shí)現(xiàn)個(gè)性化的搜索引擎。目前，不同的人使用同一搜索引擎和同一檢索詞得到的結(jié)果相同，也就是說搜索引擎沒有實(shí)現(xiàn)個(gè)性化檢索，即沒有考慮到人的地域、年齡、工作性質(zhì)等方面的差別。但是，用戶在使用搜索引擎搜索信息時(shí)，在網(wǎng)站服務(wù)器上留下了大量的有用信息，通過對(duì)這些信息的挖掘，可以發(fā)現(xiàn)一些與用戶檢索的關(guān)鍵詞密切相關(guān)的網(wǎng)頁，實(shí)現(xiàn)個(gè)性化檢索。
</p>
<p>
綜上所述，這是一個(gè)基本的搜索引擎工作流程，有助于大家加深對(duì)搜索引擎工作的認(rèn)識(shí)。搜索引擎只有一個(gè)目的，就是提供最相關(guān)的搜索結(jié)果給用戶。從搜索引擎優(yōu)化的角度而言，我們也應(yīng)該提供好的網(wǎng)頁給搜索引擎。
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