July 2018
Intermediate to advanced
310 pages
8h 21m
Chinese
Content preview from 深度学习入门 : 基于Python的理论与实现
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.
8.2 深度学习的小历史
243
袭成为一个转折点，在之后的比赛中，深度学习一直活跃在舞台中央。本节
我们以
ILSVRC
这个大规模图像识别比赛为轴，看一下深度学习最近的发展
趋势。
8.2.1
ImageNet
ImageNet
[25]
是拥有超过100 万张图像的数据集。如图8
-
7 所示，它包含
了各种各样的图像，并且每张图像都被关联了标签（类别名）。每年都会举办
使用这个巨大数据集的
ILSVRC
图像识别大赛。
mammal
vehicle craft watercraft sailing vessel sailboat trimaran
placental carnivore canine dog working dog husky
图8-7 大规模数据集ImageNet 的数据例（引用自文献[25]）
ILSVRC
大赛有多个测试项目，其中之一是“类别分类”（
classification
），
在该项目中，会进行1000 个类别的分类，比试识别精度。我们来看一下最
近几年的
ILSVRC
大赛的类别分类项目的结果。图8
-
8 中展示了从2010 年到
2015 年的优胜队伍的成绩。这里，将前 5 类中出现正确解的情况视为“正确”，
此时的错误识别率用柱形图来表示。
图 8
-
8 中需要注意的是，以2012 年为界，之后基于深度学习的方法一直
居于首位。实际上，我们发现 2012 年的
AlexNet
大幅降低了错误识别率。并且，
此后基于深度学习的方法不断在提升识别精度。特别是2015 年的
ResNet
（一
个超过150
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.