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
犬でもわかる Minimal Acyclic Subsequential Transducer...
Search
Takuya Asano
June 27, 2019
Technology
2
1.4k
犬でもわかる Minimal Acyclic Subsequential Transducer / Introduction to Minimal Acyclic Subsequential Transducer
はてなの技術勉強会で LT 発表したときの資料です。
Takuya Asano
June 27, 2019
Tweet
Share
More Decks by Takuya Asano
See All by Takuya Asano
Research Paper Introduction in IR Reading 2022 Fall
takuyaa
0
3.3k
Introducing PTHash - Paper Reading Session (2021-11-19)
takuyaa
0
410
Research Paper Introduction in IR Reading 2021 Fall
takuyaa
0
270
Lucene Index Deep Dive
takuyaa
0
620
Introduction to Apache Lucene
takuyaa
5
1.3k
Research Paper Introduction in IR Reading 2020 Fall
takuyaa
2
4.1k
Research paper introduction (2019-11-12)
takuyaa
2
1k
Research paper introduction (2019-11-07)
takuyaa
1
430
IR Reading 2019秋 論文紹介 / IR Reading 2019Fall
takuyaa
2
1.2k
Other Decks in Technology
See All in Technology
MySQL HeatWave:サービス概要のご紹介
oracle4engineer
PRO
4
1.7k
OpenAPIから画面生成に挑戦した話
koinunopochi
0
150
サイボウズフロントエンドの横断活動から考える AI時代にできること
mugi_uno
4
1.4k
株式会社ARAV 採用案内
maqui
0
330
現場が抱える様々な問題は “組織設計上” の問題によって生じていることがある / Team-oriented Organization Design 20250827
mtx2s
2
730
広島銀行におけるAWS活用の取り組みについて
masakimori
0
120
知られざるprops命名の慣習 アクション編
uhyo
10
2.3k
TypeScript入門
recruitengineers
PRO
3
200
LLM時代の検索とコンテキストエンジニアリング
shibuiwilliam
2
1.1k
[CV勉強会@関東 CVPR2025 読み会] MegaSaM: Accurate, Fast, and Robust Structure and Motion from Casual Dynamic Videos (Li+, CVPR2025)
abemii
0
180
Goss: Faiss向けの新しい本番環境対応 Goバインディング #coefl_go_jp
bengo4com
0
1.4k
開発と脆弱性と脆弱性診断についての話
su3158
1
1.1k
Featured
See All Featured
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
139
34k
Building a Modern Day E-commerce SEO Strategy
aleyda
43
7.5k
[RailsConf 2023] Rails as a piece of cake
palkan
56
5.8k
Documentation Writing (for coders)
carmenintech
73
5k
The Art of Programming - Codeland 2020
erikaheidi
55
13k
For a Future-Friendly Web
brad_frost
179
9.9k
ピンチをチャンスに:未来をつくるプロダクトロードマップ #pmconf2020
aki_iinuma
126
53k
Bash Introduction
62gerente
614
210k
Optimizing for Happiness
mojombo
379
70k
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
15
1.6k
Building Applications with DynamoDB
mza
96
6.6k
Large-scale JavaScript Application Architecture
addyosmani
512
110k
Transcript
ݘͰΘ͔Δ Minimal Acyclic Subsequential Transducer 2019-06-27 ͯͳٕज़ษڧձ id:takuya-a
FSA ͱ FST • FSA (Finite State Automaton) • ༗ݶঢ়ଶΦʔτϚτϯ
• ೖྗྻΛडཧ͢Δ͔Ͳ͏͔ͷ bool Λฦ͢ • FST (Finite State Transducer) • ༗ݶঢ়ଶมث • FSA ͷҰछ • ೖྗྻΛडཧͨ͠ͱ͖ɺग़ྗྻΛฦ͢ • Minimal Acyclic Subsequential Transducer FST ͷҰछ { “onk” } { “onk” => “͓Μ͘” }
FST ͷ͍Έͪ • ͍ΘΏΔʮࣙॻҾ͖ʯʹ͑Δ • ΩʔͱͷϖΞΛอଘͰ͖ΔʢPerl Ͱ͍͏ͱϋογϡͱͯ͑͠Δʣ • ঢ়ଶΛͨͲΔ͚ͩͳͷͰݕࡧ͕ߴ •
ͱ͘ʹ ڞ௨಄ࣙݕࡧ (common prefix search) Ͱ༗ར • ͪΖΜ શҰகݕࡧ (exact match) Ͱ͖Δ • ಄ࣙඌ͕ࣙڞ༗͞ΕΔͷͰলϝϞϦ
FST ͷԠ༻ઌ • ݕࡧΤϯδϯͷࣙॻͱͯ͠ • Apache Lucene ͷίΞΞϧΰϦζϜͱͯ͠ɺ৭Μͳͱ͜ΖͰΘΕ͍ͯΔ • ओʹ୯ޠΛϧοΫΞοϓ͢ΔͨΊʹΘΕΔ
• ܗଶૉղੳثͷࣙॻͱͯ͠ • Janome (Python), Kuromoji (Java) Ͱ࠾༻͞Ε͍ͯΔ • ߴͳ common prefix search ͕ඞཁ • ԻೝࣝͷݴޠϞσϧͱͯ͠ • ॏΈ͖ FST (Weighted FST; WFST) ͕ΘΕΔ • https://www.slideshare.net/JiroNishitoba/wfst-61929888
Minimal Acyclic Subsequential Transducer Minimal ࠷খͷ Acyclic ϧʔϓͷͳ͍ Subsequential ෦(จࣈ)ྻͷ
Transducer มث “takuya” => “a” “takaya” => “n”
TRIE • ಄ࣙͷΈΛڞ༗͢Δσʔλߏ • πϦʔʹͳΔ • ඌࣙڞ༗Ͱ͖ͳ͍ • TAIL ྻͱ͍͏ςΫχοΫͰ
Ұ෦ڞ༗Ͱ͖Δ FST TRIE
Minimal Acyclic Subsequential Transducer ͷߏங • ཧ্࠷খͷ FST Λஞ࣍తʹߏஙͰ͖ΔΞϧΰϦζϜ͕͋Δ •
ৄ͘͠ҎԼͷจΛಡΜͰʂ • Mihov & Maurel (2001), Direct Construction of Minimal Acyclic Subsequential Transducers http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.24.3698 • จதͷٙࣅίʔυɺ46ߦ͕ؒҧ͑ͯΔ͔ΒؾΛ͚ͭͯͶ • ޡ: SET_OUTPUT • ਖ਼: SET_STATE_OUTPUT
Minimal Acyclic Subsequential Transducer ͷ࣮ • https://github.com/takuyaa/cdarts • Java Ͱॻ͍ͨ
• Lucene ͷ FST jdartsclone ͱൺֱ͢ΔͨΊ • ଞͷ࣮ • Java: https://github.com/apache/lucene-solr/tree/master/lucene/core/src/java/org/apache/lucene/util/fst • Go: https://github.com/ikawaha/mast • Python: https://github.com/mocobeta/janome/blob/master/janome/fst.py • Rust: https://github.com/BurntSushi/fst
࣮ݧʂ
සग़ӳ୯ޠͷ TRIE ͱ FST • Lucene ͷετοϓϫʔυΛΩʔɺ࿈൪Λͱͯ͠ߏங • શΩʔ: 33
• શจࣈ: 97 • TRIE • ঢ়ଶ: 58 • ભҠ: 57 • FST (Minimal Acyclic Subsequential Transducer) • ঢ়ଶ: 25 • ભҠ: 51 FST TRIE
ϙέϞϯӳมثͷ TRIE ͱ FST • ϙέϞϯͷӳޠ໊ΛΩʔɺຊޠ໊Λͱͯ͠ߏங • શΩʔ: 151 •
શจࣈ: 1103 • TRIE • ঢ়ଶ: 809 • ભҠ: 808 • FST (Minimal Acyclic Subsequential Transducer) • ঢ়ଶ: 459 • ભҠ: 604 FST TRIE
FST Λ֦େͨ͠ͷ ※ UTF-8 ͰΤϯίʔυ͍ͯͯ͠ 1όΠτ͚ͩڞ༗͞ΕͨΓ͢Δ ͷͰද্ࣔจࣈԽ͚ͯ͠·͢
ࢀߟ • Mihov & Maurel (2001), Direct Construction of Minimal
Acyclic Subsequential Transducers http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.24.3698 • Finite-state automata and directed acyclic graphs http://www.jandaciuk.pl/Fsm_algorithms/ • Changing Bits: Using Finite State Transducers in Lucene http://blog.mikemccandless.com/2010/12/using-finite-state-transducers-in.html • moco(beta)'s backup: [༁] Using Finite State Transducers in Lucene https://mocobeta-backup.tumblr.com/post/105777650158/using-finite-state-transducers-in-lucene • Index 1,600,000,000 Keys with Automata and Rust - Andrew Gallant's Blog https://blog.burntsushi.net/transducers/ • moco(beta)'s backup: Lucene FST ͷΞϧΰϦζϜ (1) ʙਤղฤʙ https://mocobeta-backup.tumblr.com/post/111076688132/lucene-fst-1 • moco(beta)'s backup: Lucene FST ͷΞϧΰϦζϜ (2) ʙ࣮ฤʙ https://mocobeta-backup.tumblr.com/post/113693778372/lucene-fst-2 • LuceneͰΘΕͯΔFSTΛ࣮ͯ͠Έͨʢਖ਼نදݱϚονɿVMΞϓϩʔνͷটʣ - Qiita https://qiita.com/ikawaha/items/be95304a803020e1b2d1 • Minimal Acyclic Subsequential TransducerͰ༡Ϳ - Negative/Positive Thinking https://jetbead.hatenablog.com/entry/20151014/1444756877