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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320
1
부
머신러닝
n_labeled = 50
log_reg = LogisticRegression()
log_reg.fit(X_train[:n_labeled], y_train[:n_labeled])
테스트 세트에서 이 모델의 성능은 어떨까요?
>>> log_reg.score(X_test, y_test)
0.8333333333333334
정확도가 겨우
83
.
3
%입니다. 전체 데이터셋을 사용했을 때보다 낮은 정확도가 나온 것이 당
연합니다. 어떻게 개선할 수 있을지 알아보죠. 먼저 훈련 세트를
50
개의 클러스터로 모읍니다.
그다음 각 클러스터에서 센트로이드에 가장 가까운 이미지를 찾습니다. 이런 이미지를
대표
이
미지
representative
image
라고 부릅니다.
k = 50
kmeans = KMeans(n_clusters=k)
X_digits_dist = kmeans.fit_transform(X_train)
representative_digit_idx = np.argmin(X_digits_dist, axis=0)
X_representative_digits = X_train[representative_digit_idx]
[그림
9
-
13
]이 대표 이미지
50
개입니다.
그림
9-13
50
개의 대표 숫자 이미지(클러스터당 한 개)
이미지를 보고 수동으로 레이블을 할당해보죠.
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and much more.
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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.