I was impressed by the results in the ICML 2014 paper "Distributed Representations of Sentences and Documents" by Le and Mikolov. The technique they describe, called "paragraph vectors", learns unsupervised representations of arbitrarily-long paragraphs/documents, based on an extension of the word2vec model. The paper reports state-of-the-art performance on sentiment analysis using this technique.

I was hoping to evaluate this technique on other text classification problems, as an alternative to the traditional bag-of-words representation. However, I ran across a post by the second author in a thread in the word2vec Google group that gave me pause:

I tried myself to reproduce Quoc's results during the summer; I could get error rates on the IMDB dataset to around 9.4% - 10% (depending on how good the text normalization was). However, I could not get anywhere close to what Quoc reported in the paper (7.4% error, that's a huge difference) ... Of course we also asked Quoc about the code; he promised to publish it but so far nothing has happened. ... I am starting to think that Quoc's results are actually not reproducible.

Has anyone had success reproducing these results yet?

  • $\begingroup$ Has this situation changed, yet? I know that Gensim has implemented a version of doc2vec (paragraph/document vectors), see: radimrehurek.com/gensim/models/doc2vec.html but no attempt to reproduce the results in the paper cited here. $\endgroup$ – Doctorambient Mar 2 '15 at 20:44
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    $\begingroup$ Yes, there were attempts to reproduce the paper results using gensim: see the doc2vec IPython notebook. $\endgroup$ – Radim Aug 24 '15 at 3:08

Footnote at http://arxiv.org/abs/1412.5335 (one of the authors is Tomas Mikolov) says

In our experiments, to match the results from (Le & Mikolov, 2014), we followed the suggestion by Quoc Le to use hierarchical softmax instead of negative sampling. However, this produces the 92.6% accuracy result only when the training and test data are not shuffled. Thus, we consider this result to be invalid.

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    $\begingroup$ I don't understand why "not shuffled" ==> invalid. Is there no well-defined split between train/test set? So that what is train/test depends on how you shuffle the (original) dataset? The order of the test set shouldn't matter (there's no dynamic evaluation, right?). And the order of the training set shouldn't matter much, either... $\endgroup$ – capybaralet Oct 17 '16 at 21:22
  • $\begingroup$ @user2429920 If they're getting differences, then clearly the order does matter somehow. $\endgroup$ – JAB Nov 28 '17 at 14:50

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