Does gensim use Negative sampling in Word2vec?
Gensim's word2vec can use negative sampling. When calling class gensim.models.word2vec.Word2Vec, there is a parameter negative. The default amount is negative=5.


  negative (int, optional) – If > 0, negative sampling will be used, the int for negative specifies how many “noise words” should be drawn (usually between 5-20). If set to 0, no negative sampling is used.


The documentation is here.