gensim word2vec: Find number of words in vocabulary

Question

After training a word2vec model using python gensim, how do you find the number of words in the model\'s vocabulary?

Answer 1

One more way to get the vocabulary size is from the embedding matrix itself as in:

In [33]: from gensim.models import Word2Vec

# load the pretrained model
In [34]: model = Word2Vec.load(pretrained_model)

# get the shape of embedding matrix    
In [35]: model.wv.vectors.shape
Out[35]: (662109, 300)

# `vocabulary_size` is just the number of rows (i.e. axis 0)
In [36]: model.wv.vectors.shape[0]
Out[36]: 662109