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How web searching engines work

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How Web Search Engines Work ? Apurva Jadhav apurvajadhav[at]gmail[dot]com
Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Text Search ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Tokenizer Stemming Indexer documents Inverted Index
Document Preprocessing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Inverted Index ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Postings list fox Doc1 Doc1 Doc2 dog
Query Processing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1 2 16 4 8 9 3 16 8 honda car 8, 16
Inverted Index Construction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Inverted Index Construction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Term quick brown fox jumps over . . fox news number one . Doc ID 1 1 1 1 1 . . 2 2 2 2 .
Inverted Index Construction sort ,[object Object],1 1 2 1 Dictionary file Postings file Term brown fox fox jumps over . . . news number one . Doc ID 1 1 2 1 1 . . 2 2 2 2 . Term brown fox jumps over . . news number one . Postings file offset 0 . . . . Term quick brown fox jumps over . . fox news number one . Doc ID 1 1 1 1 1 . . 2 2 2 2 .
Relevance Ranking ,[object Object],[object Object],[object Object],[object Object],[object Object]
Vector space model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Car d q Ó© can Computer
Vector space model ,[object Object],[object Object],[object Object],[object Object],[object Object]
Performance Measure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Challenges in ranking Web pages ,[object Object],[object Object],[object Object],[object Object]
Page Rank ,[object Object],[object Object],[object Object],[object Object],[object Object]
Page Rank ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],u1 p[v1] = p[u1] + p[u2] / 2 p[v2] = p[u2]/2 + p[u3] u2 u3 v1 v2 w1
Page Rank Computation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Introduction ,[object Object],[object Object],[object Object],[object Object]
Web Crawlers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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