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百度搜索引擎工作原理-4-外部投票

外部投票是指其他網(wǎng)站通過鏈接引導(dǎo)用戶來到被投票網(wǎng)站的行為。在搜索引擎的工作原理中，外部投票是非常重要的因素之一，因?yàn)樗阉饕鎸⑵湟暈槠渌W(wǎng)站對(duì)被投票網(wǎng)站的認(rèn)可和推薦。外部投票的數(shù)量和質(zhì)量對(duì)搜索引擎的排名影響非常大。如果一個(gè)網(wǎng)站擁有高質(zhì)量的外部投票，那么搜索引擎就會(huì)認(rèn)為這個(gè)網(wǎng)站是一個(gè)權(quán)威和受歡迎的網(wǎng)站，排名會(huì)相應(yīng)提高。相反，如果一個(gè)網(wǎng)站的外部投票數(shù)量和質(zhì)量很差，搜索引擎就會(huì)認(rèn)為這個(gè)網(wǎng)站不值得被推薦，排名會(huì)下降。在外部投票中，鏈接的質(zhì)量是非常重要的因素之一。高質(zhì)量的鏈接來自于權(quán)威的網(wǎng)站，內(nèi)容與被投票網(wǎng)站相關(guān)，并且自然地合理地出現(xiàn)在網(wǎng)站中。低質(zhì)量的鏈接來自于無關(guān)、低質(zhì)量的網(wǎng)站，可能是垃圾郵件或者黑帽SEO的產(chǎn)物。因此，對(duì)于搜索引擎優(yōu)化（SEO）來說，外部投票是不可忽視的一部分。優(yōu)化者需要通過提高網(wǎng)站質(zhì)量和內(nèi)容吸引其他網(wǎng)站的鏈接，從而獲得更高的排名。同時(shí)，他們也需要注意避免使用不當(dāng)?shù)逆溄硬呗裕苊獗凰阉饕鎽土P。

Public @ 2023-04-21 22:50:31

搜索引擎檢索系統(tǒng)概述

前面簡(jiǎn)要介紹過了搜索引擎的索引系統(tǒng)，實(shí)際上在建立倒排索引的最后還需要有一個(gè)入庫寫庫的過程，而為了提高效率這個(gè)過程還需要將全部term以及偏移量保存在文件頭部，并且對(duì)數(shù)據(jù)進(jìn)行壓縮，這涉及到的過于技術(shù)化在此就不多提了。今天簡(jiǎn)要給大家介紹一下索引之后的檢索系統(tǒng)。檢索系統(tǒng)主要包含了五個(gè)部分，如下圖所示：索引&檢索.jpg（1）Query串切詞分詞即將用戶的查詢?cè)~進(jìn)行分詞，對(duì)之后的查詢做準(zhǔn)備，以“1

Public @ 2011-11-07 16:21:49

中文分詞和TF-IDF

中文分詞(Chinese Word Segmentation)指的是將一個(gè)漢字序列切分成一個(gè)一個(gè)單獨(dú)的詞。中文分詞是文本挖掘的基礎(chǔ)，對(duì)于輸入的一段中文，成功的進(jìn)行中文分詞，可以達(dá)到電腦自動(dòng)識(shí)別語句含義的效果。TF-IDF（term frequency–inverse document frequency）是一種用于信息搜索和信息挖掘的常用加權(quán)技術(shù)。在搜索、文獻(xiàn)分類和其他相關(guān)領(lǐng)域有廣泛的應(yīng)用。TF-

Public @ 2016-02-22 16:12:36

百度搜索引擎工作原理-5-結(jié)果展現(xiàn)

結(jié)構(gòu)化數(shù)據(jù)——助力站點(diǎn)獲得更多點(diǎn)擊網(wǎng)頁經(jīng)歷了抓取建庫，參與了排序計(jì)算，最終展現(xiàn)在搜索引擎用戶面前。目前在百度搜索左側(cè)結(jié)果展現(xiàn)形式很多，如：鳳巢、品牌專區(qū)、自然結(jié)果等，一條自然結(jié)果怎樣才能獲得更多的點(diǎn)擊，是站長要考慮的重要一環(huán)。目前自然結(jié)果里又分為兩類，見下圖，第一個(gè)，即結(jié)構(gòu)化展現(xiàn)，形式比較多樣。目前覆蓋80%的搜索需求，即80%的關(guān)鍵詞下會(huì)出現(xiàn)這種復(fù)雜展現(xiàn)樣式；第二個(gè)即一段摘要式展現(xiàn)，最原始的展現(xiàn)

Public @ 2021-09-11 16:21:45

百度搜索引擎工作原理

百度搜索引擎工作原理大致如下： 1. 爬蟲抓取網(wǎng)頁：百度的爬蟲程序會(huì)從互聯(lián)網(wǎng)抓取網(wǎng)頁并將其存入數(shù)據(jù)庫中。 2. 預(yù)處理：百度對(duì)所有網(wǎng)頁進(jìn)行預(yù)處理，這個(gè)過程會(huì)去除無用信息、提取關(guān)鍵詞、計(jì)算每個(gè)網(wǎng)頁的PageRank等。 3. 查詢處理：當(dāng)用戶輸入關(guān)鍵詞進(jìn)行搜索時(shí)，百度會(huì)將查詢處理成一組詞條，并進(jìn)行分類別處理，比如確定搜索意圖是找資訊、圖片、視頻等。 4. 檢索匹配：百度搜索引擎會(huì)對(duì)數(shù)據(jù)庫中的

Public @ 2023-06-20 19:50:19

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[ DB ] CONNECT:[ UseTime:0.023375s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.016889s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 7567 LIMIT 1 [ RunTime:0.015650s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'const', 'possible_keys' => 'PRIMARY', 'key' => 'PRIMARY', 'key_len' => '4', 'ref' => 'const', 'rows' => 1, 'extra' => NULL, ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='cate' order by times desc limit 15 [ RunTime:0.016058s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using filesort', ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='tags' order by times desc limit 100 [ RunTime:0.016452s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using filesort', ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='tags' order by rand() limit 30 [ RunTime:0.016596s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using temporary; Using filesort', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 7567 LIMIT 1 [ RunTime:0.015675s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'const', 'possible_keys' => 'PRIMARY', 'key' => 'PRIMARY', 'key_len' => '4', 'ref' => 'const', 'rows' => 1, 'extra' => NULL, ) ]
[ SQL ] update `ob_article` set views=views+2 where id=7567 [ RunTime:0.016458s ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海搜索引擎工作原理' AND `status` <> -1 LIMIT 1 [ RunTime:0.023691s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, 'extra' => 'Using where', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海搜索引擎工作原理' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.035692s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, 'extra' => 'Using where; Using temporary; Using filesort', ) ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海百度搜索引擎工作原理（百度搜索資源平臺(tái)）' AND `status` <> -1 LIMIT 1 [ RunTime:0.023048s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, 'extra' => 'Using where', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海百度搜索引擎工作原理（百度搜索資源平臺(tái)）' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.048260s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, 'extra' => 'Using where; Using temporary; Using filesort', ) ]

0.446119s