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
確率的データ構造を Java で扱いたい! #JJUG
Search
KOMIYA Atsushi
August 23, 2017
Programming
6
2.3k
確率的データ構造を Java で扱いたい! #JJUG
JJUG ナイト・セミナー 「ビール片手にLT&納涼会 2017」 の発表資料です。
https://jjug.doorkeeper.jp/events/63719
KOMIYA Atsushi
August 23, 2017
Tweet
Share
More Decks by KOMIYA Atsushi
See All by KOMIYA Atsushi
#JJUG Java における乱数生成器とのつき合い方
komiya_atsushi
5
5.4k
#JJUG Fork/Join フレームワークを効率的に正しく使いたい
komiya_atsushi
0
520
[#JSUG] SmartNews における container friendly な Spring Boot アプリケーション開発
komiya_atsushi
1
11k
Java のデータ圧縮ライブラリを極める #jjug_ccc #ccc_c7
komiya_atsushi
4
5.1k
#devsumi 自然言語処理・機械学習によるファクトチェック業務の支援
komiya_atsushi
1
4.6k
SmartNews Ads における機械学習の活用とその運用 #mlops
komiya_atsushi
3
19k
GBDT によるクリック率予測を高速化したい #オレシカナイト vol.4
komiya_atsushi
5
1.3k
Maven central repository の artifact をランキングする #渋谷java
komiya_atsushi
0
1.4k
High-performance Jackson #渋谷Java
komiya_atsushi
2
17k
Other Decks in Programming
See All in Programming
MLH State of the League: 2026 Season
theycallmeswift
0
220
Processing Gem ベースの、2D レトロゲームエンジンの開発
tokujiros
2
120
AIを活用し、今後に備えるための技術知識 / Basic Knowledge to Utilize AI
kishida
20
4.9k
Rancher と Terraform
fufuhu
2
200
The Past, Present, and Future of Enterprise Java
ivargrimstad
0
210
AWS発のAIエディタKiroを使ってみた
iriikeita
1
160
The Past, Present, and Future of Enterprise Java
ivargrimstad
0
330
ぬるぬる動かせ! Riveでアニメーション実装🐾
kno3a87
1
110
KessokuでDIでもgoroutineを活用する / Go Connect #6
mazrean
0
140
TanStack DB ~状態管理の新しい考え方~
bmthd
2
470
Claude Codeで実装以外の開発フロー、どこまで自動化できるか?失敗と成功
ndadayo
4
1.9k
複雑なドメインに挑む.pdf
yukisakai1225
5
970
Featured
See All Featured
Building an army of robots
kneath
306
46k
Measuring & Analyzing Core Web Vitals
bluesmoon
9
580
A designer walks into a library…
pauljervisheath
207
24k
StorybookのUI Testing Handbookを読んだ
zakiyama
31
6.1k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
7
840
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
139
34k
GraphQLとの向き合い方2022年版
quramy
49
14k
10 Git Anti Patterns You Should be Aware of
lemiorhan
PRO
656
61k
Why You Should Never Use an ORM
jnunemaker
PRO
59
9.5k
The Cost Of JavaScript in 2023
addyosmani
53
8.9k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
49
3k
Gamification - CAS2011
davidbonilla
81
5.4k
Transcript
֬తσʔλߏΛ Java Ͱѻ͍͍ͨʂ 2017-08-23 JJUG night seminar LT KOMIYA Atsushi
@komiya_atsushi
Today’s topic
֬తσʔλߏ
֬తσʔλߏͱʁ • ֬తಛੑΛར༻ͨ͠σʔλߏ • ͋ΔΛɺ࣌ؒతۭؒ͘͠తʹޮΑ͘ (≅লϝϞϦͰ) ղ͘͜ͱΛతͱ͢Δ • ࠓճʮۭؒޮͷΑ͍σʔλߏʯʹண •
σʔλߏʹΑͬͯɺݫີղͰͳۙ͘ࣅղ ͕ಘΒΕΔ͜ͱ͕͋Δ • ਫ਼ͱۭؒޮτϨʔυΦϑͷؔ
ͲΜͳͱ͖ʹ͏ͷ͔ʁ
ͲΜͳͱ͖ʹ͏ͷ͔ʁ • ϦΞϧλΠϜ͔ͭେྔʹൃੜ͢ΔσʔλΛ ΦϯϥΠϯͰॲཧ͍ͨ͠ • ϝϞϦʹऩ·Γ͖Βͳ͍େنͳσʔλΛ ඇྗͳ PC Ͱॲཧ͍ͨ͠ •
ࢄॲཧͰ͖Δڥ͕͋ΔͳΒɺ͋͑ͯ ֬తσʔλߏΛ͏ඞཁͳ͍
Java Ͱ ֬తσʔλߏΛѻ͏
ࣗલ࣮ʁ ϥΠϒϥϦ͏ʁ • ଟ͘ͷ֬తσʔλߏɺͦͷจ͕͙͙ ΕӾཡՄೳͳঢ়ଶͰ͙͢ʹݟ͔ͭΔ • ͦΕΛಡΜͰࣗલ࣮͢ΔͷΑ͠ • ҰํͰ Maven
central ʹ͍ͭ͘ͷطଘ࣮ ͕ଘࡏ͍ͯ͠Δ • ڊਓͷݞͷ্ʹཱͭͷ͕ݡ͍Γํ
֬తσʔλߏͷ Java ࣮ • stream-lib ‘com.addthis:stream-lib’ • Membership query /
cardinality estimation / frequency counting / quantile estimation • Google Guava ‘com.google.guava:guava’ • Membership query • java-hll ‘net.agkn:hll’ • Cardinality estimation • t-digest ‘com.tdunning:t-digest’ • Quantile estimation
֬తσʔλߏͷ Java ࣮ • stream-lib ‘com.addthis:stream-lib’ • Membership query /
cardinality estimation / frequency counting / quantile estimation • Google Guava ‘com.google.guava:guava’ • Membership query • java-hll ‘net.agkn:hll’ • Cardinality estimation • t-digest ‘com.tdunning:t-digest’ • Quantile estimation
stream-lib ʹΑΔ ֬తσʔλߏͷར༻ํ๏
http://bit.ly/JJUG-2017-08- probds-code
Membership query
ཁૉ͕ू߹ʹଐ͢Δ͔൱͔Λఆ͢Δ
ཁૉ͕ू߹ʹଐ͢Δ͔൱͔Λఆ͢Δ Set<T> Λ༻ҙͯ͠ Set#contains(T) Ͱଘ൱Λఆ͠ Set#add(T) Ͱू߹ʹཁૉΛՃ͢Δ
Bloom filter • ֬తʹؒҧͬͨ͑ʢଘ൱݁ՌʣΛฦ͢ • ِཅੑ (ଘࡏ͠ͳ͍ͷΛଘࡏ͢Δͱޡೝ͢ Δࣄ) ੜ͡Δ͕ɺِӄੑੜ͡ͳ͍ •
ʮఆ͞ΕΔཁૉͷछྨʯʮڐ༰Ͱ͖Δِ ཅੑͷ֬ʯΛࢦఆͯ͠ɺώʔϓ༻ྔΛ੍ޚ Ͱ͖Δ • ཁૉͷՃͰ͖Δ͕ɺআ͍͠
stream-lib ͷ Bloom filter
stream-lib ͷ Bloom filter ཁૉͱِཅੑ֬Λࢦఆͯ͠ BloomFilter Λ༻ҙ͠ BloomFilter#isPresent(String) Ͱଘ൱Λఆ Set
ͱಉ༷ʹ add() ͢Δ
ώʔϓ༻ྔΛ֬ೝͯ͠ΈΔ • “Lorem ipsum” ͷςΩετΛྫʹɺJOL (Java Object Layout) Ͱώʔϓ༻ྔΛଌఆ •
http://openjdk.java.net/projects/code- tools/jol/ • Set: 6,032 bytes • stream-lib BloomFilter: 136 bytes 97.8% smaller !
Cardinality estimation
ҟͳΓΛٻΊΔ
ҟͳΓΛٻΊΔ Set<T> Λ༻ҙ͠ɺ Set#add() Ͱͻͨ͢ΒಥͬࠐΉ Set#size() ͰҟͳΓ͕ಘΒΕΔ
HyperLogLog++ (1/2) • ҟͳΓΛਪఆ͢Δσʔλߏ • ಘΒΕΔਪఆɺຊདྷͷҟͳΓʹର্ͯ͠ৼΕɾԼৼ Εͱʹى͜Γ͏Δ • Redshift /
BigQuery / Presto ͳͲͰɺCOUNT(DISTINCT x) Λۙࣅ͢Δखஈͱͯ͠ΘΕ͍ͯΔ • https://aws.amazon.com/jp/about-aws/whats-new/ 2013/11/11/amazon-redshift-new-performance-data- loading-security-features/ • https://cloud.google.com/blog/big-data/2017/07/ counting-uniques-faster-in-bigquery-with-hyperloglog
HyperLogLog++ (2/2) • ʮਪఆͷਫ਼ pʯΛௐ͢Δ͜ͱͰɺώʔϓ༻ྔΛ੍ ޚ͢Δ͜ͱ͕Ͱ͖Δ • Λେ͖͘͢Δͱਫ਼͕ߴ͘ͳΔ & ۭؒޮѱԽ͢Δ
• ఆ͞ΕΔҟͳΓඞཁͱ͞ΕΔਫ਼ɺώʔϓͷ੍ Λߟྀͯ͠ p Λܾఆ͢Δ • HyperLogLog ͷΈΛཧղ͢ΔʹɺҎԼͷϒϩάΤϯ τϦ͕͓͢͢Ί • http://blog.brainpad.co.jp/entry/2016/06/27/110000
stream-lib ͷ HyperLogLog++
stream-lib ͷ HyperLogLog++ ਫ਼Λࢦఆͯ͠ HyperLogLogPlus() Λ༻ҙ͢Δ HyperLogLogPlus#offer() ͰཁૉΛՃ͍ͯ͘͠ HyperLogLogPlus#cardinality() ͰҟͳΓ͕ಘΒΕΔ
Frequency counting
ཁૉͷසΛ্͑͛Δ
ཁૉͷසΛ্͑͛Δ Map Ͱཁૉ͝ͱͷΧϯλΛදݱ͢Δ ͻͨ͢Βཁૉ͝ͱʹ্͑͛Δ
Count-min sketch (1/2) • ཁૉͷසΛਪఆ͢ΔσʔλߏͷҰͭ • ࣮ࡍͷසΑΓେ͖͍ਪఆΛฦ͢͜ͱ͕ ͋ΔҰํͰɺখ͍͞ਪఆΛฦ͢͜ͱͳ͍ • ස͕খ͍͞ཁૉ΄Ͳɺ͜ͷόΠΞεͷӨ
ڹΛड͚͘͢ͳΔ
Count-min sketch (2/2) • width ͱ depth ͷೋͭͷύϥϝʔλͰɺۭؒ ޮਫ਼Λ੍ޚ͢Δ •
width * depth ͷݸͷΧϯλ͕࡞ΒΕΔ • Χϯλ 2࣍ݩྻͰදݱ • depth ͷ͚ͩϋογϡ͕࣮ؔߦ͞ΕΔͷ ͰɺతͳύϑΥʔϚϯεʹӨڹΛ༩͑Δ
stream-lib ͷ Count-min sketch
stream-lib ͷ Count-min sketch width:10 * depth:30 ͷΧϯλʹΑΔ Count-Min sketch
Λ༻ҙ͢Δ CountMinSketch#add(String, int) ͰΧϯτ͍ͯ͘͠
Quantile estimation
ύʔηϯλΠϧΛٻΊΔ
ύʔηϯλΠϧΛٻΊΔ ιʔτ͞Εͨঢ়ଶͰྻԽ͢Δ ͋ͱ n ύʔηϯλΠϧΛࢀর͢Δ͚ͩ
t-digest • ྻͷҐΛਪఆ͢Δσʔλߏ • ܦݧΛۙࣅతʹදݱ͢Δ • ύʔηϯλΠϧɺ͜ͷܦݧͷۙࣅදݱ͔Βૠ Λ༻͍ͯࢉग़͞ΕΔ • ʮѹॖύϥϝʔλʯʹΑͬͯɺਫ਼ͱۭؒޮͷτϨʔυ
ΦϑΛௐ͢Δ • Λେ͖͘͢Δ͜ͱͰɺਫ਼ΛߴΊΔ͜ͱ͕Ͱ͖Δ
stream-lib ͷ t-digest
stream-lib ͷ t-digest ѹॖύϥϝʔλΛࢦఆͯ͠ TDigest Λ༻ҙ͢Δ TDigest#add(double) ͰΛՃ͍ͯ͘͠ TDigest#quantile(double) ͰύʔηϯλΠϧΛಘΔ
·ͱΊ
·ͱΊ • ֬తσʔλߏΛ༻͍Δ͜ͱͰɺେنσʔλॲཧ ΦϯϥΠϯॲཧΛޮతʹ࣮ݱͰ͖Δʢ͔ʣ • Java Ͱ֬తσʔλߏΛ͓खܰʹѻ͍͍ͨͳΒɺ ·ͣstream-lib ͷར༻Λݕ౼ͯ͠ΈΔ •
ਪఆਫ਼ͱۭؒޮͷτϨʔυΦϑΛ੍ޚ͢Δ ύϥϝʔλͷௐɺ৬ਓܳʹͳΓ͕ͪ • JOL JMH Λ༻͍ͯɺ࣮ࡍͷۭؒޮͱ࣌ؒޮΛ ͖ͪΜͱଌఆ͠ͳ͕Βௐ͢Δ͜ͱΛ͓͢͢Ί͍ͨ͠
Thank you!