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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362
2
부
신경망과 딥러닝
NOTE
_
신호는 (입력에서 출력으로) 한 방향으로만 흐릅니다. 따라서 이 구조는
피드포워드 신경망
feedforward
neural
network
(
FNN
)에 속합니다.
은닉층
19
을 여러 개 쌓아 올린 인공 신경망을
심층 신경망
deep
neural
network
(
DNN
)이라고 합니다.
딥러닝은 심층 신경망을 연구하는 분야이며 조금 더 일반적으로는 연산이 연속하여 길게 연결
된 모델을 연구합니다. 그렇지만 많은 사람들은 (얕더라도 ) 신경망이 사용되면 딥러닝이라고
말합니다.
연구자들은 다층 퍼셉트론을 훈련할 방법을 찾기 위해 오랫동안 고군분투했지만 성공하지 못
했습니다. 하지만
1986
년 데이비드 루멜하트
David
Rumelhart
, 제프리 힌턴, 로날드 윌리엄스
Ronald
Williams
가
역전파
backpropagation
훈련 알고리즘을 소개하는 획기적인 논문
20
을 공개했습니다. 이 알
고리즘은 오늘날에도 여전히 사용됩니다. 간단히 말하면 이 알고리즘은 효율적인 기법으로 그
레이디언트를 자동으로 계산하는 (
4
장에서 소개한 ) 경사 하강법입니다.
21
네트워크를 두 번
(정방향 한 번, 역방향 한 번) 통과하는 것만으로 이 역전파 알고리즘은 모든 모델 파라미터에
대한 네트워크 오차의 그레이디언트를 계산할 수 있습니다. 다른 말로 ...
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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.