20news数据集。 The 20 Newsgroups data set is a collection of approximately 20,000 newsgroup documents, partitioned (nearly) evenly across 20 different newsgroups. To the best of my knowledge, it was originally collected by Ken Lang, probably for his New
from sklearn.datasets import fetch_20newsgroups操作时需要下载文本数据20newsgroups，若发生下载url获取失败，应对方法：打开site-packages/sklearn/datasets下的twenty_newsgroups.py文件，找到download_20newsgroups方法，注释掉其中url相关苦干行控制下载的语句。运行后提示c://user//...，按提示在c://user//...下新建文件夹scikit_learn_d
