January 2017
Beginner to intermediate
312 pages
7h 3m
Korean
Content preview from 밑바닥부터 시작하는 딥러닝
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240
밑바닥부터 시작하는 딥러닝
7.3
풀링 계층
풀링은 세로·가로 방향의 공간을 줄이는 연산입니다. 예를 들어 [그림
7
-
14
]와 같이
2
×
2
영
역을 원소 하나로 집약하여 공간 크기를 줄입니다.
그림
7-14
최대 풀링의 처리 순서
[그림
7
-
14
]는
2
×
2
최대 풀링
max
pooling
, 맥스 풀링
을 스트라이드
2
로 처리하는 순서입니다. 최대 풀
링은 최댓값
max
을 구하는 연산으로, ‘
2
×
2
’는 대상 영역의 크기를 뜻합니다. 즉
2
×
2
최대 풀링
은 그림과 같이
2
×
2
크기의 영역에서 가장 큰 원소 하나를 꺼냅니다. 또, 스트라이드는 이 예
에서는
2
로 설정했으므로
2
×
2
윈도우가 원소
2
칸 간격으로 이동합니다. 참고로, 풀링의 윈도
우 크기와 스트라이드는 같은 값으로 설정하는 것이 보통입니다. 예를 들어 윈도우가
3
×
3
이
면 스트라이드는
3
으로, 윈도우가
4
×
4
이면 스트라이드를
4
로 설정합니다.
WARNING
_ 풀링은 최대 풀링 외에도 평균 풀링
average
pooling
등이 있습니다. 최대 풀링은 대상 영역에서
최댓값을 취하는 연산인 반면, 평균 풀링은 대상 영역의 평균을 계산합니다. 이미지 인식 분야에서는 주로 최
대 풀링을 사용합니다. 그래서 이 책에서 풀링 계층이라고 하면 최대 풀링을 말하는 것입니다.
7.3.1
풀링 계층의 특징
풀링 계층의 특징은 ...
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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.