sklearn.datasets.fetch_20newsgroups_vectorized

sklearn.datasets.fetch_20newsgroups_vectorized(subset='train', remove=(), data_home=None, download_if_missing=True, return_X_y=False)[source]

Load the 20 newsgroups dataset and vectorize it into token counts (classification).

Download it if necessary.

This is a convenience function; the transformation is done using the default settings for sklearn.feature_extraction.text.CountVectorizer. For more advanced usage (stopword filtering, n-gram extraction, etc.), combine fetch_20newsgroups with a custom sklearn.feature_extraction.text.CountVectorizer, sklearn.feature_extraction.text.HashingVectorizer, sklearn.feature_extraction.text.TfidfTransformer or sklearn.feature_extraction.text.TfidfVectorizer.

Classes 20
Samples total 18846
Dimensionality 130107
Features real

Read more in the User Guide.

Parameters:
subset : ‘train’ or ‘test’, ‘all’, optional

Select the dataset to load: ‘train’ for the training set, ‘test’ for the test set, ‘all’ for both, with shuffled ordering.

remove : tuple

May contain any subset of (‘headers’, ‘footers’, ‘quotes’). Each of these are kinds of text that will be detected and removed from the newsgroup posts, preventing classifiers from overfitting on metadata.

‘headers’ removes newsgroup headers, ‘footers’ removes blocks at the ends of posts that look like signatures, and ‘quotes’ removes lines that appear to be quoting another post.

data_home : optional, default: None

Specify an download and cache folder for the datasets. If None, all scikit-learn data is stored in ‘~/scikit_learn_data’ subfolders.

download_if_missing : optional, True by default

If False, raise an IOError if the data is not locally available instead of trying to download the data from the source site.

return_X_y : boolean, default=False.

If True, returns (data.data, data.target) instead of a Bunch object.

New in version 0.20.
Returns:
bunch : Bunch object with the following attribute:
  • bunch.data: sparse matrix, shape [n_samples, n_features]
  • bunch.target: array, shape [n_samples]
  • bunch.target_names: a list of categories of the returned data, length [n_classes].
  • bunch.DESCR: a description of the dataset.
(data, target) : tuple if return_X_y is True

New in version 0.20.