1package main
 2
 3type UserModel struct {
 4	ID      string `json:"id"`
 5	Age     int    `json:",string"`
 6	Actions []string
 7}
 8type ItemModel struct {
 9	ID           string
10	TRecommended int
11	TActed       int
12	TScored      int //times acted from recommendation
13}
14
15var scores []float64
16var ranking []ItemModel