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A set of tools to compress gensim fasttext models

Project description

Compress-fasttext

This Python 3 package allows to compress fastText models (from the gensim package) by orders of magnitude, without seriously affecting their quality.

Use it like this:

import gensim
import compress_fasttext
big_model = gensim.models.fasttext.FastTextKeyedVectors.load('path-to-original-model')
small_model = compress_fasttext.prune_ft_freq(big_model, pq=True)
small_model.save('path-to-new-model')

Different compression methods include:

  • matrix decomposition (svd_ft)
  • product quantization (quantize_ft)
  • optimization of feature hashing (prune_ft)
  • feature selection (prune_ft_freq)

The recommended approach is combination of feature selection and quantization (the function prune_ft_freq with pq=True).

This code is heavily based on the navec package by Alexander Kukushkin and the blogpost by Andrey Vasnetsov about shrinking fastText embeddings.

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