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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130
1
부
머신러닝
하지만 잠깐만요 ! 데이터를 자세히 조사하기 전에 항상 테스트 세트를 만들고 따로 떼어놓아야
합니다. 사실
MNIST
데이터셋은 이미 훈련 세트(앞쪽
60
,
000
개 이미지 )와 테스트 세트(뒤
쪽
10
,
000
개 이미지 )로 나누어놓았습니다.
X_train, X_test, y_train, y_test = X[:60000], X[60000:], y[:60000], y[60000:]
훈련 세트는 이미 섞여 있어서 모든 교차 검증 폴드를 비슷하게 만듭니다(하나의 폴드라도 특
정 숫자가 누락되면 안 됩니다 ). 더군다나 어떤 학습 알고리즘은 훈련 샘플의 순서에 민감해서
많은 비슷한 샘플이 연이어 나타나면 성능이 나빠집니다. 데이터셋을 섞으면 이런 문제를 방지
할 수 있습니다.
3
3.2
이진 분류기 훈련
문제를 단순화해서 하나의 숫자, 예를 들면 숫자
5
만 식별해보겠습니다. 이 ‘
5
-
감지기’는 ‘
5
’와
‘
5
아님’ 두 개의 클래스를 구분할 수 있는
이진 분류기
binary
classifier
의 한 예입니다. 분류 작업을
위해 타깃 벡터를 만들어보겠습니다.
y_train_5 = (y_train == 5)
# 5는 True고, 다른 숫자는 모두 False
y_test_5 = (y_test == 5)
좋습니다. 이제 분류 모델을 하나 선택해서 훈련시켜보겠습니다. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.