The aim of this article is to show that the document embedding using the doc2vec algorithm can substantially improve the performance of the standard method for unsupervised document classification - the K-means clustering. We have performed rather extensive set of experiments on one English and two Czech datasets and the results suggest that representing the documents using vectors generated by the doc2vec algorithm brings a consistent improvement across languages and datasets. The English dataset - 20NewsGroups - was processed in a way that allows direct comparison with the results of both supervised and unsupervised algorithms published previously. Such comparison is provided in the paper, together with the results of supervised classification achieved by the state-of-the-art SVM classifier.
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