VBPR

A simple version of VBPR.

Two files are needed to run "VBPR.py"

"image_feature.csv" The first column of the csv file is item id, while each line is the corresponding feature of the item.

This file is to build a dictionary of item_id and item_feature : self.imageFeatures.
"feedback_file.json" The file stores the feedback data of users & items, which has the structure as follows:
```
 { "user_id1" : { "item_id_1", "item_id_2", ... },
   "user_id2" : { "item_id_i", "item_id_j", ... },
    ... }
```
This file is to build the user-item relation map: self.R.

You need to complete the code in line 113-114 with the path of the above files.

The update edition

An end to end VBPR, which is no need to load all image features at begining.

Three files are needed to run "VBPR_update.py"

"user_idx.json" & "item_idx.json". Structures are as follows,

{ "user_0": 0, "user_1": 1, ..., "user_n": n-1 } { "item_0": 0, "item_1": 1, ..., "item_m": m-1 }
Your own rating file. The interaction between users and items are needed.

Step to run "VBPR_update.py"