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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287
부록
연습문제 정답
tf
=
transform
_
rotate
_
about
_
center
(
image
.
shape
,
30
)
plt
.
imshow
(
apply
_
transform
(
image
,
tf
));
정답 : 메모리 사용량 줄이기
5
.
4
.
1
절 ‘연습문제 : 메모리 사용량 줄이기’
여기서 생성하는 배열
np
.
ones
은 읽기 전용이다. 이 배열은
coo
_
matrix
( ) 함수에 의해서
합산되는 값으로만 사용된다.
broadcast
_
to
( ) 함수를 사용하면 ‘사실상’ 반복되는
n
번의 요
소 하나만 사용하여 비슷한 배열을 만들 수 있다.
def
confusion
_
matrix
(
pred
,
gt
):
n
=
pred
.
size
ones
=
np
.
broadcast
_
to
(
1
.,
n
) #
1
로 구성된 크기
n
의 가상 배열
cont
=
sparse
.
coo
_
matrix
((
ones
, (
pred
,
gt
)))
return
cont
예상대로 동작하는지 살펴보자.
288
우아한 사이파이
cont
=
confusion
_
matrix
(
pred
,
gt
)
print
(
cont
.
toarray
())
[[
3
.
1
.]
[
2
.
4
.]] ...
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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.