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Lab seminar20100604
1.
Tha Anatomy of
a Large-‐Scale Social Search Engine, www2010
2.
• Damon Horowitz,
Sepandar D. Kamvar • The Anatomy of a Large-‐Scale Social Search Engine • WWW 2010 • Aardvark QA • web
3.
• QA
• • • • Google
4.
•
Aardvark • : Google • • • • • • • • “Do you have any good babysiLer recommendaMons in Palo Alto for my 6-‐year-‐old twins? I’m looking for somebody that won’t let them watch TV.”
5.
• Crawler and
Indexer – • Query Analyzer – • Ranking FuncMon – • UI – UI
6.
7.
s(ui ,u j
,q) = p(ui | u j ) • p(ui | q) = p(ui | u j )∑ p(ui | t) p(t | q) t∈T • p(ui|uj): quality score • p(ui|q): relevance score • u: q: t:
8.
P(ui|t)
• p(t | ui ) p(ui ) p(ui | t) = • p(t) • s(t | ui ) = p(t | ui ) + γ ∑u∈U p(t | u) • facebook • blog ∑ p(t | u ) = 1 i • /twiLer t∈T € € • • •
9.
P(ui|uj)
• – – – – – – – –
10.
P(t|q)
: • Non QuesMon Classifier – • Inappropriate QuesMon Classifier – • Trivial QuesMon Classifier – • LocaMon SensiMve Classifier –
11.
P(t|q)
: • – Keyword Match Topic Mapper • – Taxonomy Topic Mapper • SVM 3000 – Salient Term Topic Mapper • d-‐idf – User Tag Topic Mapper •
12.
•
– Topic ExperMse: p(ui|q) – Connectedness: p(ui|uj) – Availability: • –
13.
14.
15.
16.
•
– Google PC • Mobile Google Aardvark – Google Aardvark
17.
•
• Aardvark 18.6 words 98.1% 2.2 2.9 words 57 63%
18.
•
– fact
19.
• 57.2% 10
– facebook 15.7% 15 • 6 37
20.
• 87.7%
• 2.08
21.
• 97.7%
3 • 174,605 • 1,199,323
22.
• Google
– 200 Aardvark – Aardvark google 5 – 10 Aardvark 5 71.5% 3.93 ± 1.23 Google 2 70.5% 3.07 ± 1.46
23.
•
– • • • •
24.
• “
” Aardvark • Aardvark • Aardvark • “ ” •
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