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This repository contains the word2vec C code, but with comments. Run

    git diff original

to see the complete set of changes to the original code.

Cross-reference this code with the original papers:

and the essential follow-up paper:

The following gensim blog posts by Radim Řehůřek are very interesting and informative:

And---shameless plug---I wrote a C++ implementation of word2vec (the skip-gram with negative sampling (SGNS) algorithm) that also supports streaming (vocabulary and embedding model are learned in one pass, see the write-up on arXiv for details):

The original content of README.txt follows the break.

Tools for computing distributed representtion of words

We provide an implementation of the Continuous Bag-of-Words (CBOW) and the Skip-gram model (SG), as well as several demo scripts.

Given a text corpus, the word2vec tool learns a vector for every word in the vocabulary using the Continuous Bag-of-Words or the Skip-Gram neural network architectures. The user should to specify the following:

  • desired vector dimensionality
  • the size of the context window for either the Skip-Gram or the Continuous Bag-of-Words model
  • training algorithm: hierarchical softmax and / or negative sampling
  • threshold for downsampling the frequent words
  • number of threads to use
  • the format of the output word vector file (text or binary)

Usually, the other hyper-parameters such as the learning rate do not need to be tuned for different training sets.

The script downloads a small (100MB) text corpus from the web, and trains a small word vector model. After the training is finished, the user can interactively explore the similarity of the words.

More information about the scripts is provided at