May 2018
Beginner to intermediate
672 pages
16h 54m
Korean
Content preview from 핸즈온 머신러닝: 사이킷런과 텐서플로를 활용한 머신러닝, 딥러닝 실무
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270
1
부
머신러닝
이 장에서는 차원의 저주에 대해 논의하고 고차원 공간에서 어떤 일이 일어나는지 알아보겠습
니다. 그런 다음 차원 축소에 사용되는 두 가지 주요 접근 방법(투영
projection
과 매니폴드 학습
Manifold
Learning
)을 소개하겠습니다. 그리고 가장 인기 있는 차원 축소 기법인
PCA
, 커널
PCA
,
LLE
를 다루도록 하겠습니다.
8.1
차원의 저주
우리는
3
차원
1
세계에서 살고 있어서 고차원 공간을 직관적으로 상상하기 어렵습니다.
1
,
000
차
원의 공간에서 휘어져 있는
200
차원의 타원체는 고사하고 기본적인
4
차원 초입방체
hypercube
조
차도 머릿속에 그리기 어렵습니다(그림
8
-
1
).
그림
8-1
점, 선, 정사각형, 정육면체, 테서랙트(
0
차원에서
4
차원까지의 초입방체 )
2
차원
고차원 공간에서는 많은 것이 상당히 다르게 작동합니다. 예를 들어 단위 면적(
1
×
1
사각형 )
안에 있는 점을 무작위로 선택한다면 경계선에서
0
.
001
이내에 위치할 가능성은
0
.
4
%입니다
1
시간까지 고려하면
4
차원이고 끈 이론가라면 더 늘어날 수 있습니다. 옮긴이_ 대표적으로 초끈(
superstring
) 이론은 물질의 구성 요소
를 소립자가 아니라
10
-
33
cm
라는 극히 작은 고무줄 같은 끈이라고 생각합니다. 여기서는
3
차원 공간의 모든 점에
6
차원 ...
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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.