Item remap id 0 may cause KeyError

[UesugiErii]

In your preprocess code, item new remap id start from 1, and 0 for padding item id.

But in train.evaluate_full function, D, I = gpu_index.search(user_embs, topN), I may contains 0, since item_cate_map dont have 0 as key, so an error occurred in compute_diversity function.

Two error example logs are shown below

GRU4REC_5.LOG
DNN_5_taobao.LOG