January 2017
Beginner to intermediate
312 pages
7h 3m
Korean
Content preview from 밑바닥부터 시작하는 딥러닝
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64
밑바닥부터 시작하는 딥러닝
3.1.1
신경망의 예
신경망을 그림으로 나타내면 [그림
3
-
1
]처럼 됩니다. 여기에서 가장 왼쪽 줄을
입력층
, 맨 오른
쪽 줄을
출력층
, 중간 줄을
은닉층
이라고 합니다. 은닉층의 뉴런은 (입력층이나 출력층과 달리)
사람 눈에는 보이지 않습니다. 그래서 ‘은닉’인 것이죠. 또한, 이 책에서는 입력층에서 출력층
방향으로 차례로
0
층,
1
층,
2
층이라 하겠습니다 (층 번호를
0
부터 시작하는 이유는 파이썬 배
열의 인덱스도
0
부터 시작하여, 나중에 구현할 때 짝짓기 편하기 때문입니다). [그림
3
-
1
]에
서는
0
층이 입력층,
1
층이 은닉층,
2
층이 출력층이 됩니다.
그림
3-1
신경망의 예
입력층
은닉층
출력층
WARNING
_ [그림
3
-
1
]의 신경망은 모두
3
층으로 구성됩니다만, 가중치를 갖는 층은
2
개뿐이기 때문에
‘
2
층 신경망’이라고 합니다. 문헌에 따라서는 신경망을 구성하는 층수를 기준으로 [그림
3
-
1
]을 ‘
3
층 신경망’
이라고 하는 경우도 있으니 주의해야 합니다. 이 책에서는 실제로 가중치를 갖는 층의 개수 (입력층, 은닉층,
출력층의 합계에서
1
을 뺀 값 )를 기준으로 하겠습니다.
[그림
3
-
1
]은 앞 장에서 본 퍼셉트론과 특별히 달라 보이지 않습니다. 실제로 뉴런이 연결되
는 방식은 앞 장의 퍼셉트론에서 달라진 것이 없답니다. ...
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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.