Beytab

> understand Thank you for anwser the question! The approach your've provided can not solve the problem in my case, in which potential user choosing for the product assigned by...

You can not predict for cold-start users without nothing about user_features. ref:https://stackoverflow.com/questions/46924119/lightfm-handling-user-and-item-cold-start

add an sigmoid after the distance can solve the problem!