September 2023
Beginner to intermediate
1044 pages
27h 52m
Korean
Content preview from 핸즈온 머신러닝(3판)
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963
부록 C
자동 미분
이 규칙으로부터 [식
C
-
1
]을 유도할 수 있습니다.
식
C-1
f
(
x
,
y
)
의 편도함수
( ) ( )
( )
101
2
200
2
22
2
22
+=++=
∂
∂
+
∂
∂
+
∂
∂
=
∂
∂
=++
∂
∂
=
∂
∂
+
∂
∂
+
∂
∂
=
∂
∂
xx
yy
y
y
yx
y
f
xy
x
x
y
xx
y
x
yx
x
f
함수가 아주 복잡해지면 이 방식은 매우 번거롭고 실수할 위험이 큽니다. 다행히 다른 방법이
있습니다. 유한 차분 근사에 관해 알아보겠습니다.
C.2
유한 차분 근사
x
0
에서 함수
h
(
x
)
의 도함수
)(
0
xh
′
은 그 포인트에서 함수의 기울기입니다. 더 정확하게 말해
서 도함수는
x
가 포인트
x
0
에 무한히 가까워질 때 두 점을 지나는 접선의 기울기로 정의됩니다
(식
C
-
2
).
식
C-2
포인트
x
0
에서 함수
h
(
x
)
의 도함수 정의
( ) ( )
ε
ε
ε
00
0
0
0
0
xhxh
xx
xhxh
xh
xx
−+
=
−
−
=
′
→
→
lim
)()(
lim)(
0
만약
x
=
3
이고
y
=
4
일 때 함수
f
(
x
,
y
)
의 편도함수를 계산하려면 매우 작은 수
ε
을 사용해
),(),( 4343 ff −+
ε
를 계산하고
ε
으로 나누면 됩니다. 이런 도함수의 수치적 근사 방법을
유한 차분 근사
finite
difference
approximation
라고 부릅니다. 그리고 이 방정식을
뉴턴의 차분몫
Newton
’
s
difference
quotient
이라 합니다. 다음은
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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.