July 2020
Beginner to intermediate
444 pages
10h 50m
Korean
Content preview from 핸즈온 비지도 학습
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253
8
장
핸즈온 오토인코더
8
장에서는 과소완전, 과대완전, 희소, 노이즈 제거, 변분 오토인코더를 포함한 오토인코더의
다양한 버전을 사용해 응용 프로그램을 구축할 겁니다.
4
장에서 소개한 신용카드 사기 탐지 문제로 다시 돌아가 봅시다. 신용카드 거래 총
284
,
807
건
중에서
492
건만 사기 거래입니다. 우리는 지도 학습 모델을 사용해 평균 정밀도
0
.
82
를 달성
했으며 이 결과는 매우 인상적이었습니다. 이 모델은 정밀도
80
% 이상으로 사기 거래의
80
%
이상을 탐지할 수 있었습니다. 또한, 비지도 학습 모델을 사용해 평균 정밀도
0
.
69
를 달성했습
니다.
75
% 이상의 정밀도로 사기 거래의
75
% 이상을 탐지할 수 있었습니다. 이는 레이블을 사
용하지 않은 점을 감안하면 매우 좋은 결과였습니다.
이제 동일한 문제를 오토인코더를 사용해 어떻게 해결할 수 있는지 살펴보겠습니다. 오토인코
더는 비지도 학습 알고리즘이지만 신경망을 사용합니다.
8.1
데이터 준비
먼저 필요한 라이브러리를 로드합니다.
''' 메인 라이브러리'''
import numpy as np
import pandas as pd
핸즈온 오토인코더
CHAPTER
8
254
3부 텐서플로와 케라스를 사용한 비지도 학습 모델
import os, time, re
import pickle, gzip
'''시각화 관련
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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.