June 2018
Beginner to intermediate
304 pages
7h 38m
Korean
Content preview from 우아한 사이파이: 수학, 과학, 엔지니어링을 위한 파이썬 데이터 분석 라이브러리 SciPy
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189
5
장
희소행렬과 혼동행렬
hygx
=
px
@
xlog1x
(
Px
_
inv
@
Pxy
).
sum
(
axis
=
1
)
hxgy
=
xlog1x
(
Pxy
@
Py
_
inv
).
sum
(
axis
=
0
) @
py
# 엔트로피의 합을 반환한다.
return
float
(
hygx
+
hxgy
)
자동 분할
S
와 실젯값
T
의 정보 변형 (
VI
)에 대해서 올바른 값
1
을 부여하는지 확인할 수 있다.
variation
_
of
_
information
(
S
,
T
)
1
.
0
희소 혼동행렬은 엔트로피를 효율적으로 계산하는 데
3
가지 유형의 희소행렬 (
COO
,
CSR
, 대
각행렬 )을 사용할 수 있다. 여기서 넘파이는 비효율적이다 (실제로 위의 접근법은 파이썬의
MemoryError
에서 영감을 받았다 ).
5.9
정보 변형 사용하기
자동 이미지 분할을 잘 예측하는 정보 변형 (
VI
)의 예제를 살펴보자.
3
장에서 이미지 분할에
호랑이 사진을 사용했다 (그림
5
-
2
).
3
장을 건너 뛰었다면
3
장으로 돌아가서 이미지 분할에
대해서 살펴보자.
3
장에서 배운 기법을 사용하여 호랑이 그림을 분할하는 여러 방법을 생성한
후, 최적의 이미지를 찾아보자.
from
skimage
import
io
url
= ('
http
://
www
.
eecs
.
berkeley
.
edu
/
Research
/
Projects
/
CS
/
vision ...
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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.