April 2019
Beginner to intermediate
480 pages
12h 34m
Korean
Content preview from 파이썬 라이브러리를 활용한 머신러닝(번역개정판): 사이킷런 핵심 개발자가 쓴 머신러닝과 데이터 과학 실무서
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7
장
텍스트 데이터 다루기
433
그림
7-2
tf
-
idf
특성으로 훈련시킨 로지스틱 회귀의 최댓값, 최솟값 계수
왼쪽의 음수 계수는 모델에서 부정적인 리뷰를 의미하는 단어에 속하고, 오른쪽 양수 계
수는 긍정적인 리뷰의 단어에 해당합니다. 대부분의 단어는 매우 직관적입니다. “
worst
”,
“
disappointment
”, “
laughable
”는 부정적인 리뷰이며, 반면에 “
excellent
”, “
wonderful
”,
“
enjoyable
”, “
refreshing
”는 긍정적인 리뷰임을 말해줍니다. “
bit
”, “
job
”, “
today
” 같은 단
어들은 조금 덜 명확하지만 아마도 “
good
job
”이나 “
best
today
” 같은 구절의 일부로 보입
니다.
7.7
여러 단어로 만든
BOW
(
n
-그램)
BOW
표현 방식은 단어의 순서가 완전히 무시된다는 큰 단점이 있습니다. 그렇기 때문에 의
미가 완전히 반대인 두 문자열 “
it
’
s
bad
,
not
good
at
all
”과 “
it
’
s
good
,
not
bad
at
all
”이
완전히 동일하게 변환됩니다. 단어 앞에 등장하는 “
not
”은 (극단적일 경우 ) 문맥의 중요성을
잘 보여주는 예입니다. 다행히도
BOW
표현 방식을 사용할 때 문맥을 고려하는 방법이 있습니
다. 토큰 하나의 횟수만 고려하지 않고 옆에 있는 두세 ...
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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.