Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
俺の全文検索エンジン(Go製)を作り始めた
Search
kotaroooo0
November 11, 2020
Programming
0
100
俺の全文検索エンジン(Go製)を作り始めた
kotaroooo0
November 11, 2020
Tweet
Share
More Decks by kotaroooo0
See All by kotaroooo0
データ鮮度を落とさずに安全にReindexしたい
kotaroooo0
0
48
検索エンジン自作入門 Go Conference 2021 Spring
kotaroooo0
17
7.2k
転置インデックスでどう検索しているか
kotaroooo0
0
250
ぼくのかんがえたさいきょうのDocker Build
kotaroooo0
0
81
Other Decks in Programming
See All in Programming
Open source software: how to live long and go far
gaelvaroquaux
0
660
負債になりにくいCSSをデザイナとつくるには?
fsubal
10
2.6k
kintone開発を効率化するためにチームで試した施策とその結果を大放出!
oguemon
0
140
クリーンアーキテクチャから見る依存の向きの大切さ
shimabox
5
960
責務と認知負荷を整える! 抽象レベルを意識した関心の分離
yahiru
8
1.3k
コミュニティ駆動 AWS CDK ライブラリ「Open Constructs Library」 / community-cdk-library
gotok365
2
240
Rails 1.0 のコードで学ぶ find_by* と method_missing の仕組み / Learn how find_by_* and method_missing work in Rails 1.0 code
maimux2x
1
190
Jasprが凄い話
hyshu
0
150
もう僕は OpenAPI を書きたくない
sgash708
5
1.9k
Djangoにおける複数ユーザー種別認証の設計アプローチ@DjangoCongress JP 2025
delhi09
PRO
4
460
dbt Pythonモデルで実現するSnowflake活用術
trsnium
0
260
color-scheme: light dark; を完全に理解する
uhyo
7
490
Featured
See All Featured
Designing Experiences People Love
moore
140
23k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
175
52k
Art, The Web, and Tiny UX
lynnandtonic
298
20k
Designing for Performance
lara
604
68k
We Have a Design System, Now What?
morganepeng
51
7.4k
Building a Scalable Design System with Sketch
lauravandoore
461
33k
For a Future-Friendly Web
brad_frost
176
9.6k
VelocityConf: Rendering Performance Case Studies
addyosmani
328
24k
Become a Pro
speakerdeck
PRO
26
5.2k
A Tale of Four Properties
chriscoyier
158
23k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
666
120k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
33
2.1k
Transcript
2020/11/11 @kotaroooo0 ԶͷશจݕࡧΤϯδϯ(Go) Λ࡞Γ࢝Ίͨ
͜ͷLTΛฉ͘ͱ… 1. ͳΜͱͳ͘શจݕࡧΤϯδϯͷΈ͕͔ Δ 2. GoͰશจݕࡧΤϯδϯΛ࡞Γ࢝ΊΒΕΔ
-શจݕࡧΤϯδϯͷΈΛΔ -ElasticsearchͰΘΕ͍ͯΔApache LuceneΆ͍༷ͷͷΛ࡞Δ -GoΛֶΜͰ͍ΔͷͰԿ͔࡞Γ͍ͨ -Twitter BotΛ࡞͍ͬͯΔ͕ɺͪΐ͏Ͳ͍͍શจݕࡧΤϯδϯ͕ͳ͍ -ܰྔɺ͔ͭॏΈ͖ϨʔϕϯγϡλΠϯڑΛܭࢉͰ͖Δͭ શจݕࡧΤϯδϯΛ࡞Δཧ༝
3Ͱ͔ΔશจݕࡧΤϯδϯ
શจݕࡧͷΈ INDEXING ୯ޠ จॻ have 1,2 pen 1 we 2
Desk 2 จॻ1 “I have a pen.” จॻ2 “We have desk.” CHAR FILTER TOKENIZER TOKEN FILTER Analyzer
શจݕࡧͷΈ SEARCH ୯ޠ จॻ have 1,2 pen 1 we 2
Desk 2 ݕࡧϫʔυ: “pen” จॻ1͕ώοτ CHAR FILTER TOKENIZER TOKEN FILTER Analyzer
ANALYZERͳͥඞཁ? - τʔΫϯׂͯ͘͠ΕΔͨΊ - “I have a pen.” ͜ͷ··ͰసஔΠϯσοΫε Λ࡞Ͱ͖ͳ͍ͷͰɺI,
have, a, penͱτʔΫ ϯׂ͍ͨ͠ - ΫΤϦͷදه༳ΕΛٵऩͨ͠Γ͢ΔͨΊ - “GOD”ͱ͍͏୯ޠΛؚΉυΩϡϝϯτ ɺ”god”Ͱώοτ͢ΔΑ͏ʹখจࣈʹ౷Ұ ͍ͤͨ͞ - ແବͳτʔΫϯͷϑΟϧλϦϯά - theͳͲΠϯσΩγϯάͯ͠ແବ Analyzeલ Analyzeޙ “I have a BIG pen!” have, big, pen
۩ମతͳANALYZERྫ - Char Filter(Tokenizerͷલʹॲཧ͢Δ) 0ݸҎ্ - Mapping: إจࣈΛ୯ޠʹมͳͲ - HTMLstrip:
HTMLΛύʔε - Tokenizer(τʔΫϯׂ͢Δ) 1ݸ - Standard: εϖʔεͳͲϧʔϧʹैׂͬͯ - Kuromoji: ܗଶૉղੳͰׂ - Ngram: Nจࣈ͝ͱʹׂ - Token Filter(Tokenizerͷޙʹॲཧ͢Δ) 0ݸҎ্ - Lowercase: খจࣈ - Stopword: ετοϓϫʔυআڈ - Stemming: දه༳Ε CHAR FILTER TOKENIZER TOKEN FILTER Analyzer
࣮
ANALYZERͷ࣮ߦΠϝʔδ Analyzeલ MappingCharFilter StandardTokenizer LowercaseFilter StopWordFilter StemmerFilter I have a
lot of TASKs. I am very sad :( I have a lot of TASKs. I am very sad _sad_ I, have, a, lot, of, TASKs, I, am, very, sad, sad I, have, a, lot, of, tasks, I, am, very, sad, sad lot, tasks, am, very, sad, sad lot, task, am, very, sad, sad ॲཧͷྲྀΕ
ANALYZERͷ࣮
CHAR FILTERͷ࣮
TOKENIZERͷ࣮
TOKEN FILTERͷ࣮
INDEX - సஔΠϯσοΫε map[string][]int - సஔΠϯσοΫεΛϑΟʔϧυ ໊͝ͱʹ࣋ͭ - υΩϡϝϯτɺIDͱϑΟʔϧ υΛ࣋ͭ
- Indexing͢Δͱ͖AnalyzerΛ ௨͢
SEARCH -ANDݕࡧͱORݕࡧ -ΫΤϦ: “pink orange blue” -ANDݕࡧ: 3 -OR: ݕࡧ1,2,3,4,5,6
pink Orange blue 6 3 4 5 2 1
ಈ͔ͯ͠ΈΔ
ݕࡧྫ - ※Analyzer͖ͬ͞ͱಉ༷ - IndexSearchAnalyzerΛ௨͢ - ”foxes”Ͱ”fox”ΛؚΉυΩϡϝϯτ͕Ϛον - ”happy”Ͱ”:)”ΛؚΉυΩϡϝϯτ͕Ϛον -
ANDݕࡧ - fine,FaX,foxes,happy͕શؚͯ·Ε͍ͯΔυΩϡϝ ϯτ1,2͕ώοτ͍ͯ͠Δ
ࠓޙ -͍͋·͍ݕࡧΛ࣮͢Δ -Fuzzy QueryɺSuggesters -είΞܭࢉΛ࣮͢Δ -IFIDF, BM25
ࢀߟ -https://github.com/kotaroooo0/stalefish -https://artem.krylysov.com/blog/2020/07/28/lets-build-a-full-text-search-engine/