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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420
파이썬 라이브러리를 활용한 머신러닝(번역개정판)
토큰화
희소 행렬 인코딩
어휘 사전 구축
그림
7-1
샘플 데이터에
BOW
적용하기
출력은 각 문서에서 나타난 단어의 횟수가 담긴 하나의 벡터입니다. 이를 위해 사전에 있는 각
단어가 문서마다 얼마나 자주 나타나는지 세야 합니다. 즉, 이 수치 표현은 전체 데이터셋에서
고유한 각 단어를 특성으로 가집니다. 원본 문자열에 있는 단어의 순서는
BOW
특성 표현에서
는 완전히 무시됩니다.
7.3.1
샘플 데이터에
BOW
적용하기
BOW
표현은
CountVectorizer
에 변환기 인터페이스로 구현되어 있습니다. 두 샘플만 포함
한 간단한 데이터셋에 적용해 어떻게 작동하는지 보겠습니다.
In [10]:
bards_words =["The fool doth think he is wise,",
"but the wise man knows himself to be a fool"]
다음과 같이
CountVectorizer
를 임포트하고 객체를 만들어 샘플 데이터에
fit
메서드를 적용
합니다.
In [11]:
from sklearn.feature_extraction.text import CountVectorizer
7
장
텍스트 데이터 다루기
421
vect = CountVectorizer()
vect.t(bards_words)
CountVectorizer ...
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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.