elastic search에서 무엇을 검색한 경우, 유사한 것들에 대해 검색 결과를 반환합니다.
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What portion of the retrieved data is actually relevant to the search query?
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What portion of relevant data is being returned as search results?
Precision and Recall are inversely related. like:
- Precision
- query와 완벽히 매치되는 결과를 반환.
- 반환되는 document가 적을 수 있음.
- Recall
- retrieve lot of result
- 많은 결과를 반환.
- query에 대해 완벽히 매치되는 document가 아닐 수 있음.
- value that represents how relevant a document is to that specific query
- score is computed for each document that is a hit.
- score use 2 type of data.
- term frequency
- inverse document frequency
for example, let's say search term is "How to form good habits"
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IDF decrease weight which occur very frequently. our case, habit occurred very frequently.
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