August 2022
Intermediate to advanced
441 pages
11h 26m
Chinese
Content preview from Python文本分析
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.
文本分类算法
｜
183
才能判断出是否发生了变化。最后一个需要注意的参数是
stratify
，这个参数可以
确保在分割训练与测试数据集的时候，目标变量的分布保持不变。如果不能保持目
标变量的分布不变，则训练数据集中某个类的观测可能会比较多，就不能反映训练
数据中的分布了，最后会导致模型得出一个不符合实际的函数：
X_train, X_test, Y_train, Y_test = train_test_split(df['text'],
df['Priority'],
test_size=0.2,
random_state=42,
stratify=df['Priority'])
print('Size of Training Data ', X_train.shape[0])
print('Size of Test Data ', X_test.shape[0])
输出结果：
Size of Training Data 36024
Size of Test Data 9006
6.3.3
第三步：训练机器学习模型
创建文本分类解决方案的下一步是使用合适的算法训练监督机器学习模型。在文本 ...
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.