May 2018
Beginner to intermediate
672 pages
16h 54m
Korean
Content preview from 핸즈온 머신러닝: 사이킷런과 텐서플로를 활용한 머신러닝, 딥러닝 실무
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144
1
부
머신러닝
>>>
forest
_
clf
.
predict
_
proba
([
some
_
digit
])
array
([[
0
.
1
,
0
.
,
0
.
,
0
.
1
,
0
.
,
0
.
8
,
0
.
,
0
.
,
0
.
,
0
.
]])
이 결과에서 분류기가 예측 결과에 강한 확신을 보이고 있음을 알 수 있습니다. 배열의 다섯 번
째 값인
0
.
8
은 모델이 이 이미지가
5
일 가능성을
80
%로 추정한다는 뜻입니다. 또한 (각
10
%
확률로 )
0
이나
3
일 수도 있다고 생각합니다.
이제 물론 분류기를 평가해보고 싶을 것입니다. 분류기 평가에는 일반적으로 교차 검증을 사용
합니다.
cross
_
val
_
score
( )
함수를 사용해
SGDClassifier
의 정확도를 평가해보겠습니다.
>>>
cross
_
val
_
score
(
sgd
_
clf
,
X
_
train
,
y
_
train
,
cv
=
3
,
scoring
=
"
accuracy
")
array
([
0
.
84063187
,
0
.
84899245
,
0
.
86652998
])
모든 테스트 폴드에서
84
% 이상을 얻었습니다. 랜덤 분류기를 사용했다면
10
% 정확도를 얻었
을 것이므로 이 점수가 아주 나쁘지는 않지만 성능을 더 높일 여지가 있습니다. 예를 들어 간단
하게 입력의 스케일을 조정하면 (
2
장에서처럼 ) 정확도를
90
% 이상으로 높일 수 있습니다.
>>>
from sklearn
.
preprocessing ...
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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.
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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.