April 2019
Beginner to intermediate
480 pages
12h 34m
Korean
Content preview from 파이썬 라이브러리를 활용한 머신러닝(번역개정판): 사이킷런 핵심 개발자가 쓴 머신러닝과 데이터 과학 실무서
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3
장
비지도 학습과 데이터 전처리
217
그림
3-17
성분 7의 계수가 큰 얼굴들
예상대로 성분
7
에 대한 계수 값이 큰 얼굴들은 왼쪽으로 돌아가 있고(그림
3
-
16
), 성분
3
에
대한 계수 값이 큰 얼굴들은 오른쪽으로 돌아가 있습니다. 앞서 말한 것처럼, 이와 같은 패턴을
추출하는 것은 소리, 유전자 표현, 텍스트 데이터처럼 덧붙이는 구조를 가진 데이터에 적합합
니다. 인위적인 데이터셋을 사용한 예를 통해서 이에 관해 자세히 살펴보겠습니다.
다음은 세 개의 서로 다른 입력으로부터 합성된 신호입니다 (그림
3
-
18
).
In [40]:
S = mglearn.datasets.make_signals()
plt.gure(gsize=(6, 1))
plt.plot(S, '-')
plt.xlabel("시간")
plt.ylabel("신호")
그림
3-18
원본 신호
218
파이썬 라이브러리를 활용한 머신러닝(번역개정판)
불행히도 우리는 원본 신호는 볼 수 없고 이 세 개가 섞인 신호만 관찰할 수 있는 상황입니다.
그래서 합쳐진 신호를 분해해서 원본 신호를 복원해야 합니다. 이 신호를 여러 방법으로
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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.