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QUERY ANALYZER 소개
in Information Retrieval
Rupert Yoonsub Kim(my@rupert.in)
CONTENTS
용어정리
QA의 용도
Parser와 Analyzer 의 차이
Token에 대해서
QA의 처리과정
QA Filters
용어정리
Term
Token
Query Parser
preprocess
Query Analyzer
QUERY PARSER
검색 텍스트 중 검색(분석기)에 의미있는
부분만 분석기에 넘기는 역할 (=
preprocess)
필터라는 뜻은 아닙니다!
QUERY ANALYZER
사용자가 입력한 텍스트에서 토큰을 추출,
가공
최종 Term과 Token으로 변환하는 도구
TERM
색인하는 가장 기본적인 단위
검색 작업에 사용할 가장 기본적인 단위
QA를 통해 분석하여 텍스트를 기본적인 단
위인 Term으로 만들게 된다.
TOKEN
QA를 통해 생성된 데이터 포멧
Term + 분석에 필요한 속성
대상단어
전체 텍스트에서 토큰의 위치(시작, 끝)
토큰의 종류
위치 증가 값
…
QUERY PASER와
QUERY ANALYZER의 관계보기
QUERY PARSER → QUERY ANALYZER
Query Parser
Query Analyzer
the time is running
JS Bin
….
the “time” is running -out
Query Parser는
“Html의 특정 태그값”
“XML의 특정 값”
“검색어의 특정값”
필요한 값만을 뽑아내어 QA에게 보내는 역할을
합니다
텍스트가 검색 QUERY가 되기까지
텍스트가 TOKEN이 되고 변형시키는 과정
Reader
Tokenizer
TokenFilter
TokenFilter
TokenFilterTokenFilter
Text
Final Token
필요한 필터들을 통과시킨다
TOKEN FILTER 예시
StopFilter
불용어 목록에 해당하는 토큰을 모두 제거
LowerCaseFilter
토큰의 글자를 소문자로 변경
PorterStemFilter
토큰의 문자열을 기본형으로 변경 ex) eating -> eat
TOKEN의 구조
QA
Query Analyzer
the time is running
JS Bin
….
time be run
time period be run
QA는 앞에서 본 필터등을 통해
“단어의 원형으로 변형”
“유의어 (time->period) 동시 검색”
등을 할 수 있도록 돕는 역할을 하게됩니다.
ref. Lucene In Action
“The end of slides”

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Query Analyer 는 뭘까 대체!