fetch_20newsgroups 數據集導入失敗: no handlers could be fetch_20newsgroups

最簡單的辦法

下載'20news-bydate.pkz', 放到C:\\Users\[Current user]\scikit_learn_data 下邊就行.

 

實際上

scikit learning默認的路徑是C:\\Users\[Current user]\scikit_learn_data

也可以添加環境變量'SCIKIT_LEARN_DATA', 程序會在環境變量設置的目錄后加scikit_learn_data作為數據集存放的目錄

不想用這兩個目錄的話,可以改site-package/sklearn/datasets/base.py里 的函數: get_data_home(data_home=None)

 

另一個解決的辦法是

1. 手動下載 http://qwone.com/~jason/20Newsgroups/20news-bydate.tar.gz,

    存放到scikit_learn_data/20news_home/下

2. 改site-package/sklearn/datasets/twenty_newsgroups.py里的函數: download_20newsgroups

　注釋掉下邊代碼:

    if not os.path.exists(target_dir):
        os.makedirs(target_dir)

    if os.path.exists(archive_path):
        # Download is not complete as the .tar.gz file is removed after
        # download.
        logger.warning("Download was incomplete, downloading again.")
        os.remove(archive_path)

    logger.warning("Downloading dataset from %s (14 MB)", URL)
    opener = urlopen(URL)
    with open(archive_path, 'wb') as f:
        f.write(opener.read())

 3. 運行, 程序會自動解壓20news-bydate.tar.gz,生成緩存文件20news-bydate.pkz.