May 2022
Beginner to intermediate
448 pages
13h 7m
Korean
book
밑바닥부터 시작하는 데이터 과학 데이터 분석을 위한 파이썬 프로그래밍과 수학·통계 기초
by Joel Grus, Hangyeol Kim, Seongju Ha, Eunjung Park
Content preview from 밑바닥부터 시작하는 데이터 과학 데이터 분석을 위한 파이썬 프로그래밍과 수학·통계 기초
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
Data Science
190
타낸다. 즉, 이 식은 비트코인이라는 단어가 포함된 모든 메시지 중에서 스팸 메
시지의 비율을 나타낸다고 이해할 수 있다.
만약 수많은 스팸 메시지와 스팸이 아닌 메시지를 갖고 있다면
P
(
B
|
S
)와
P
(
B
|
J
S
)를 쉽게 추정할 수 있다. 만약 메시지가 스팸일 확률과 스팸이 아닐
확률이 동일하다면(즉,
P
(
S
) =
P
(
J
S
) =
0
.
5
) 앞의 식을 다음과 같이 정리할 수
있다.
P(S|B) = P(B|S)/ [P(B|S) + P(B|
J
S)]
예를 들어 스팸 메시지 중
50
%, 스팸이 아닌 메시지 중
1
%만이 비트코인이라는
단어를 포함하고 있다면 비트코인이라는 단어를 포함하고 있는 메시지가 스팸
일 확률은 다음과 같다.
0
.
5
/ (
0
.
5
+
0
.
01
) =
98
%
13.2
조금 더 똑똑한 스팸 필터
이제 더 많은 단어
w
1
...,
w
n
이 주어졌다고 해보자. 확률 이론을 적용하기 위해
단어
w
i
가 메시지에 포함되는 경우를
X
i
로 나타내자. 또한 (아직 설명되지 않은
어떤 방법에 의해) 스팸 메시지에
i
번째 단어가 포함되어 있는 확률인
P
(
X
i
|
S
)와
스팸이 아닌 메시지에
i
번째 단어가 포함되어 있는 확률인
P
(
X
i
|
J
S
)가 주어졌다
고 해보자.
나이브 베이즈(
Naive
Bayes
)의 핵심은 ‘메시지가 스팸이냐 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.