How to load the sentence vectors?

There doesn't seem to be a method to load the sentence vectors similar to `Word2Vec.load_word2vec_format` to load the word2vec model. So if I use this same method to load the sent2vec model  `model = Word2Vec.load_word2vec_format('test.txt.model')`

I get an error: 
`UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 0: invalid start byte`