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Information Retrieval
What’s Information Retrieval
What’s Information Retrieval
Find documents relevant to an information need
from a large document set
What’s Information Retrieval
5
What’s Document
6
What’s Relevance
7
What’s Relevance
IR vs Database
Find records with Age > 50 in table
IR vs Database
Buying a New Home
10
IR vs Database
Databases IR
Data Structured Unstructured
Fields
Clear semantics
(SSN, age)
No fields (other than
text)
Queries
Defined (relational
algebra, SQL)
Free text (“natural
language”), Boolean
Recoverabil
ity
Critical (concurrency
control, recovery,
atomic operations)
Downplayed though still
an issue
Matching
Exact (results are
always “correct”)
Imprecise (need to
measure effectiveness)
Search Engine Architecture
Search Engine Architecture
Indexing Process
12
Query Process
Indexing Process
13
Text Acquisition
Text Acquisition
Text Acquisition
Text Transformation
Text Transformation
Text Transformation
Stopping
Unimportant words such as “a”
Stemming
“buying” versus “buy.”
Synonyms
“buying” and “purchasing” or “home” and “house.”
How to Searching?
How to Searching?
How to Searching?
Inverted Indexing
Query Process
24
User Interface
User Interface
User Interface
Ranking
Ranking Function
Ranking Function
Ranking Function
Issue
Relevance
Logs & Users Information Needs
Large scale
SNS Search
Library and Framework

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정보 검색 이론 (Information retrival)