April 2020
Intermediate to advanced
816 pages
18h 32m
Chinese
Content preview from 精通機器學習
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.
生成對抗網路
|
579
例如
，
當我們建構生成網路的輸出
，
讓它從
4 × 4
變成
8 × 8
時
（
見圖
17-19），
我們要將
一個升抽樣層
（
使用最近鄰點過濾
）
加到既有的摺積層
，
讓它輸出
8 × 8
的特徵圖
，
接著
將它傳給新的摺積層
（
它使用
"same"
填補
，
步幅
1，
所以它的輸出也是
8 × 8）。
在這一個
新階層後面
，
再加上一個新的輸出摺積層
：
這是一般的摺積層
，
它的核大小是
1，
可將輸
出投射至期望的顏色通道數量
（
例如
3）。
為了避免加入新摺積層時破壞第一個摺積層訓
練好的權重
，
最後的輸出是原始輸出層
（
現在輸出
8 × 8
的特徵圖
）
與新輸出層的加權總
和
。
新輸出的權重是
α，
原始輸出的是
1 – α，
且
α
會慢慢從
0
遞增至
1。
換句話說
，
新的
摺積層
（
在圖
17-19
的虛線部分
）
會慢慢加入
，
而原始的輸出層會慢慢淡出
。
將新摺積層
加入鑑別網路時
（
接著加入降抽樣的平均池化層
）
也會使用類似的加入
/
淡出技術
。
+
8 × 8 × 3
×a
×(1 – a)
8 × 8 × 25
6
8 × 8 × 512
4 × 4 × 512
摺積層 1
升抽樣
輸出摺積層
稠密
雜訊
4
× 4 × 512
摺積層 1
輸出摺積層
稠密
雜訊
4
× 4 × 512
4 × 4 × 3
輸出摺積層
摺積層 2
8 × 8 × 38 × 8 × 3
圖
17-19
逐漸建構
GAN：GAN
生成網路輸出
4 × 4
彩色圖像
（
左
）；
我們將它擴展成輸出
8 × 8
圖像
（
右
）
這篇論文也介紹了一些旨在提升輸出多樣性
（
來避免模式崩潰
），
以及讓訓練更穩定的
技術
：
580
|
第十七章：使用自動編碼網路與 GAN ...
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.