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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744
2
부
신경망과 딥러닝
이 식의 첫 번째 형태를 더 간단히 쓰는 방법은
ab←
α
표기법을 사용하는 것입니다. 이 표기는
a
k
+
1
← (
1
–
α
)·
a
k
+
α
·
b
k
를 뜻합니다. 따라서 [식
18
-
4
]의 첫 번째 줄을 다음과 같이 다시
쓸 수 있습니다.
Vs rV
s
()
←+
′
()
α
γ
∙
TIP
TD
학습은 확률적 경사 하강법(
SGD
)과 비슷한 점이 많습니다. 특히 한 번에 하나의 샘플을 다루는 점이 같
습니다.
SGD
와 같이 학습률을 점진적으로 줄여가야 올바르게 수렴할 수 있습니다(그렇지 않으면 최적의
Q
-
가치 주변을 오갈 것입니다).
각 상태
s
에서 이 알고리즘은 에이전트가 이 상태를 떠났을 때 얻을 수 있는 당장의 보상과 (최
적으로 행동한다고 가정하여 ) 나중에 기대할 수 있는 보상을 더한 이동 평균
30
을 저장합니다.
18.9
Q
-러닝
비슷하게
Q
-러닝
Q
-
learning
알고리즘은 전이 확률과 보상을 초기에 알지 못한 상황에서
Q
-가치
반복 알고리즘을 적용한 것입니다 (식
18
-
5
).
Q
-러닝은 에이전트가 플레이(예를 들면 랜덤
하게 )하는 것을 보고 점진적으로
Q
-가치 추정을 향상하는 방식으로 작동합니다. 정확한 (또
는 충분히 근접한 )
Q
-가치 추정을 얻게되면 최적의 정책은 가장 높은
Q
-가치를 가지는 행동
을 선택하는 것입니다 (즉, 탐욕적 정책입니다
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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.