//- 💫 DOCS > USAGE > WORD VECTORS & SIMILARITIES

include ../../_includes/_mixins

p
    |  Dense, real valued vectors representing distributional similarity
    |  information are now a cornerstone of practical NLP. The most common way
    |  to train these vectors is the #[+a("https://en.wikipedia.org/wiki/Word2vec") word2vec]
    |  family of algorithms. The default
    |  #[+a("/docs/usage/models#available") English model] installs
    |  300-dimensional vectors trained on the Common Crawl
    |  corpus using the #[+a("http://nlp.stanford.edu/projects/glove/") GloVe]
    |  algorithm. The GloVe common crawl vectors have become a de facto
    |  standard for practical NLP.

+aside("Tip: Training a word2vec model")
    |  If you need to train a word2vec model, we recommend the implementation in
    |  the Python library #[+a("https://radimrehurek.com/gensim/") Gensim].

+h(2, "101") Similarity and word vectors 101
    +tag-model("vectors")

include _spacy-101/_similarity
include _spacy-101/_word-vectors


+h(2, "custom") Customising word vectors

p
    |  By default, #[+api("token#vector") #[code Token.vector]] returns the
    |  vector for its underlying #[+api("lexeme") #[code Lexeme]], while
    |  #[+api("doc#vector") #[code Doc.vector]] and
    |  #[+api("span#vector") #[code Span.vector]] return an average of the
    |  vectors of their tokens.

p
    |  You can customize these
    |  behaviours by modifying the #[code doc.user_hooks],
    |  #[code doc.user_span_hooks] and #[code doc.user_token_hooks]
    |  dictionaries.

+code("Example").
    # TODO

p
    |  You can load new word vectors from a file-like buffer using the
    |  #[code vocab.load_vectors()] method. The file should be a
    |  whitespace-delimited text file, where the word is in the first column,
    |  and subsequent columns provide the vector data.  For faster loading, you
    |  can use the #[code vocab.vectors_from_bin_loc()] method, which accepts a
    |  path to a binary file written by #[code vocab.dump_vectors()].

+code("Example").
    # TODO

p
    |  You can also load vectors from memory by writing to the
    |  #[+api("lexeme#vector") #[code Lexeme.vector]] property. If the vectors
    |  you are writing are of different dimensionality
    |  from the ones currently loaded, you should first call
    |  #[code vocab.resize_vectors(new_size)].

+h(2, "similarity") Similarity