glove-python

A toy python implementation of GloVe.

Glove produces dense vector embeddings of words, where words that occur together are close in the resulting vector space.

While this produces embeddings which are similar to word2vec (which has a great python implementation in gensim), the method is different: GloVe produces embeddings by factorizing the logarithm of the corpus word co-occurrence matrix.

The code uses asynchronous stochastic gradient descent, and is implemented in Cython. Most likely, it contains a tremendous amount of bugs.

Installation

Install from pypi using pip: pip install glove_python.

Note for OSX users: due to its use of OpenMP, glove-python does not compile under Clang. To install it, you will need a reasonably recent version of gcc (from Homebrew for instance). This should be picked up by setup.py; if it is not, please open an issue.

Building with the default Python distribution included in OSX is also not supported; please try the version from Homebrew or Anaconda.

Usage

Producing the embeddings is a two-step process: creating a co-occurrence matrix from the corpus, and then using it to produce the embeddings. The Corpus class helps in constructing a corpus from an interable of tokens; the Glove class trains the embeddings (with a sklearn-esque API).

There is also support for rudimentary pagragraph vectors. A paragraph vector (in this case) is an embedding of a paragraph (a multi-word piece of text) in the word vector space in such a way that the paragraph representation is close to the words it contains, adjusted for the frequency of words in the corpus (in a manner similar to tf-idf weighting). These can be obtained after having trained word embeddings by calling the transform_paragraph method on the trained model.

Examples

example.py has some example code for running simple training scripts: ipython -i -- examples/example.py -c my_corpus.txt -t 10 should process your corpus, run 10 training epochs of GloVe, and drop you into an ipython shell where glove.most_similar('physics') should produce a list of similar words.

If you want to process a wikipedia corpus, you can pass file from here into the example.py script using the -w flag. Running make all-wiki should download a small wikipedia dump file, process it, and train the embeddings. Building the cooccurrence matrix will take some time; training the vectors can be speeded up by increasing the training parallelism to match the number of physical CPU cores available.

Running this on my machine yields roughly the following results:

In [1]: glove.most_similar('physics')
Out[1]:
[('biology', 0.89425889335342257),
 ('chemistry', 0.88913708236100086),
 ('quantum', 0.88859617025616333),
 ('mechanics', 0.88821824562025431)]

In [4]: glove.most_similar('north')
Out[4]:
[('west', 0.99047203572917908),
 ('south', 0.98655786905501008),
 ('east', 0.97914140138065575),
 ('coast', 0.97680427897282185)]

In [6]: glove.most_similar('queen')
Out[6]:
[('anne', 0.88284931171714842),
 ('mary', 0.87615260138308615),
 ('elizabeth', 0.87362497374226267),
 ('prince', 0.87011034923161801)]

In [19]: glove.most_similar('car')
Out[19]:
[('race', 0.89549347066796814),
 ('driver', 0.89350343749207217),
 ('cars', 0.83601334715106568),
 ('racing', 0.83157724991920212)]

Development

Pull requests are welcome.

When making changes to the .pyx extension files, you'll need to run python setup.py cythonize in order to produce the extension .c and .cpp files before running pip install -e ..