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
Tree Methods
Search
Sunmi Yoon
November 04, 2019
Technology
0
110
Tree Methods
Decision Tree, Random Forest를 dataitgirls3 학생들에게 가르치기 위해 만든 수업자료입니다.
Sunmi Yoon
November 04, 2019
Tweet
Share
More Decks by Sunmi Yoon
See All by Sunmi Yoon
데이터 분석가 채용 공고 읽는 방법
ysunmi0427
1
320
Deep down in classification 0.5 magic number
ysunmi0427
0
87
Confusion matrix
ysunmi0427
0
140
심슨의 역설
ysunmi0427
0
2.1k
회사는 어떤 사람을 데이터 분석가로 채용하고 싶어하는 것일까?
ysunmi0427
0
2.2k
Other Decks in Technology
See All in Technology
[OpsJAWS Meetup33 AIOps] Amazon Bedrockガードレールで守る安全なAI運用
akiratameto
1
110
事業モメンタムを生み出すプロダクト開発
macchiitaka
0
100
いまからでも遅くない!コンテナでWebアプリを動かしてみよう!コンテナハンズオン編
nomu
0
170
IAMポリシーのAllow/Denyについて、改めて理解する
smt7174
2
210
目標と時間軸 〜ベイビーステップでケイパビリティを高めよう〜
kakehashi
PRO
8
660
4th place solution Eedi - Mining Misconceptions in Mathematics
rist
0
150
AI自体のOps 〜LLMアプリの運用、AWSサービスとOSSの使い分け〜
minorun365
PRO
7
590
EDRの検知の仕組みと検知回避について
chayakonanaika
12
5.1k
開発組織を進化させる!AWSで実践するチームトポロジー
iwamot
2
460
Exadata Database Service on Cloud@Customer セキュリティ、ネットワーク、および管理について
oracle4engineer
PRO
2
1.5k
データエンジニアリング領域におけるDuckDBのユースケース
chanyou0311
9
2.3k
MIMEと文字コードの闇
hirachan
2
1.4k
Featured
See All Featured
What's in a price? How to price your products and services
michaelherold
244
12k
GraphQLとの向き合い方2022年版
quramy
44
14k
How to Ace a Technical Interview
jacobian
276
23k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
4
380
No one is an island. Learnings from fostering a developers community.
thoeni
21
3.2k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
44
7k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
193
16k
Bash Introduction
62gerente
611
210k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
366
25k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
StorybookのUI Testing Handbookを読んだ
zakiyama
28
5.5k
Transcript
Tree methods dataitgirls3 Instructor Sunmi Yoon
Decision Tree
Sex <= 0.5 gini = 0.473 samples = 891 value
= [549, 342] class = Survived Fare <= 26.269 gini = 0.306 samples = 577 value = [468, 109] class = Survived True Fare <= 48.2 gini = 0.383 samples = 314 value = [81, 233] class = Dead False gini = 0.226 samples = 415 value = [361, 54] class = Survived gini = 0.448 samples = 162 value = [107, 55] class = Survived gini = 0.447 samples = 225 value = [76, 149] class = Dead gini = 0.106 samples = 89 value = [5, 84] class = Dead
Sex <= 0.5 gini = 0.473 samples = 891 value
= [549, 342] class = Survived Fare <= 26.269 gini = 0.306 samples = 577 value = [468, 109] class = Survived True Fare <= 48.2 gini = 0.383 samples = 314 value = [81, 233] class = Dead False gini = 0.226 samples = 415 value = [361, 54] class = Survived gini = 0.448 samples = 162 value = [107, 55] class = Survived gini = 0.447 samples = 225 value = [76, 149] class = Dead gini = 0.106 samples = 89 value = [5, 84] class = Dead Root Node (ࡸܻ) Intermediate Node (о) Terminal Node, Leaf ()
Sex <= 0.5 gini = 0.473 samples = 891 value
= [549, 342] class = Survived Fare <= 26.269 gini = 0.306 samples = 577 value = [468, 109] class = Survived True Fare <= 48.2 gini = 0.383 samples = 314 value = [81, 233] class = Dead False gini = 0.226 samples = 415 value = [361, 54] class = Survived gini = 0.448 samples = 162 value = [107, 55] class = Survived gini = 0.447 samples = 225 value = [76, 149] class = Dead gini = 0.106 samples = 89 value = [5, 84] class = Dead അ ਤী ؘఠо ݻ ѐ ਤ೧ ח Ӓ ؘఠٜ যڃ ۄ߰ਸ оҊ ח
Sex <= 0.5 gini = 0.473 samples = 891 value
= [549, 342] class = Survived Fare <= 26.269 gini = 0.306 samples = 577 value = [468, 109] class = Survived True Fare <= 48.2 gini = 0.383 samples = 314 value = [81, 233] class = Dead False gini = 0.226 samples = 415 value = [361, 54] class = Survived gini = 0.448 samples = 162 value = [107, 55] class = Survived gini = 0.447 samples = 225 value = [76, 149] class = Dead gini = 0.106 samples = 89 value = [5, 84] class = Dead যڃ ӝળਵ۽ оӝܳ ೮ח (gini ژח entropy)
Sex <= 0.5 gini = 0.473 samples = 891 value
= [549, 342] class = Survived Fare <= 26.269 gini = 0.306 samples = 577 value = [468, 109] class = Survived True Fare <= 48.2 gini = 0.383 samples = 314 value = [81, 233] class = Dead False gini = 0.226 samples = 415 value = [361, 54] class = Survived gini = 0.448 samples = 162 value = [107, 55] class = Survived gini = 0.447 samples = 225 value = [76, 149] class = Dead gini = 0.106 samples = 89 value = [5, 84] class = Dead Terminal Nodeী بೠ ؘఠٜਸ যڌѱ ࠙ܨೡ Ѫੋ
sklearn Code
Impurity
Impurity ࢎѾաޖח Impurity (ࠛࣽب, ࠛഛपࢿ) ծইח ߑߨਵ۽ णפ. ࣽبо ૐоೞח
Ѫਸ فҊ Information gainۄҊ ೞӝب פ. য়ט ࢎѾաޖ ࠛࣽب ஏ ߑߨ , Gini Indexܳ ҕࠗפ.
Sex <= 0.5 gini = 0.473 samples = 891 value
= [549, 342] class = Survived Fare <= 26.269 gini = 0.306 samples = 577 value = [468, 109] class = Survived True Fare <= 48.2 gini = 0.383 samples = 314 value = [81, 233] class = Dead False gini = 0.226 samples = 415 value = [361, 54] class = Survived gini = 0.448 samples = 162 value = [107, 55] class = Survived gini = 0.447 samples = 225 value = [76, 149] class = Dead gini = 0.106 samples = 89 value = [5, 84] class = Dead G = d ∑ i=1 Ri ( 1 − m ∑ k=1 p2 ik) Step 1. gini = 0.473 ਸ ҅೧ যࠁࣁਃ Step 2. gini = 0.226 ਸ ҅೧ যࠁࣁਃ
https://imgur.com/n3MVwHW
Random Forest
ৈ۞ ܻٜਸ ‘ܰѱ’ ݅ٚ. https://www.researchgate.net/figure/Architecture-of-the-random-forest-model_fig1_301638643
https://community.alteryx.com/t5/Alteryx-Designer-Knowledge-Base/Seeing-the-Forest-for-the-Trees-An-Introduction-to-Random-Forest/ta-p/158062 bagging = bootstrap aggregating
Bagging ߓӦ(bagging) bootstrap aggregating ড۽, ࠗझە(bootstrap)ਸ ా೧ ઑӘঀ ܲ ള۲
ؘఠী ೧ ള۲ػ ӝୡ ࠙ܨӝ(base learner)ٜਸ Ѿ(aggregating)दఃח ߑߨ. ࠗझەۆ, য ള۲ ؘఠীࢲ ࠂਸ ೲਊೞৈ ਗ ؘఠࣇҗ э ӝ ؘఠࣇਸ ݅٘ח җਸ ݈ೠ. ߓӦਸ ా೧ ےؒ ನۨझܳ ള۲दఃח җ җ э ࣁ ױ҅۽ ೯ػ. 1. ࠗझە ߑߨਸ ా೧ Nѐ ള۲ ؘఠࣇਸ ࢤࢿೠ. 2. Nѐ ӝୡ ࠙ܨӝ(ܻ)ٜਸ ള۲दఅ. 3. ӝୡ ࠙ܨӝ(ܻ)ٜਸ ೞա ࠙ܨӝ(ےؒ ನۨझ)۽ Ѿೠ(ಣӐ ژח җ߈ࣻై ߑध ਊ). Wikipedia ےؒನۨझ > ߓӦਸ ਊೠ ನۨझ ҳࢿ
sklearn Code