May 2020
Beginner to intermediate
952 pages
24h 11m
Korean
Content preview from 핸즈온 머신러닝(2판): 사이킷런, 케라스, 텐서플로 2를 활용한 머신러닝, 딥러닝 완벽 실무
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145
3
장
분류
>>> roc_auc_score(y_train_5, y_scores_forest)
0.9983436731328145
정밀도와 재현율 점수를 계산하면
99
.
0
% 정밀도와
86
.
6
% 재현율이 나옵니다. 나쁘지 않군요!
이제 이진 분류기를 훈련시키는 방법과 작업에 맞는 적절한 지표 선택, 교차 검증을 사용한 평
가, 요구 사항에 맞는 정밀도/재현율 트레이드오프 선택,
ROC
곡선과
ROC
AUC
점수를 사용
한 여러 모델의 비교에 대해 알게 되었을 것입니다. 다음에는 숫자
5
이상을 감지해보겠습니다.
3.4
다중 분류
이진 분류가 두 개의 클래스를 구별하는 반면
다중 분류기
multiclass
classifier
(또는
다항 분류기
multinomial
classifier
)는 둘 이상의 클래스를 구별할 수 있습니다.
(
SGD
분류기, 랜덤 포레스트 분류기, 나이브 베이즈
naive
Bayes
분류기 같은) 일부 알고리즘은
여러 개의 클래스를 직접 처리할 수 있는 반면, (로지스틱 회귀나 서포트 벡터 머신 분류기 같
은) 다른 알고리즘은 이진 분류만 가능합니다. 하지만 이진 분류기를 여러 개 사용해 다중 클
래스를 분류하는 기법도 많습니다.
예를 들어 특정 숫자 하나만 구분하는 숫자별 이진 분류기
10
개(
0
에서 부터
9
까지 )를 훈련시
켜 클래스가
10
개인 숫자 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.