Friend recommendation method, device and system and computer storage medium

The invention discloses a friend recommendation method, device and system and a computer storage medium. The method comprises the following steps: acquiring all historical user data, and constructing a forward index, an attribute inverted index and a relationship inverted index according to all the historical user data; obtaining an input user ID, and obtaining historical user IDs related to the input user ID according to the indexes; weighting and scoring the related historical user IDs through a weighting table to obtain score values of all the users; recommending a first preset number of historical users at the top of the score list to obtain to-be-recommended users; and generating a feature sequence according to the attribute data and the relational data of the input user and the to-be-recommended users, inputting the feature sequence into a pre-training model to obtain the probability that the input user and each to-be-recommended user become friends, and recommending a second preset number of historical