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Results 3 issues of loading376

what does "src_cls_dim" mean? when I train my custom dataset, I need to modify it.

When I train my dataset, why does "assert len(roidb)==len(cached_rodb)" always appear? Are fsod_train_gt_roidb.pkl and fsod_test_gt_roidb.pkl special for fsod dataset? ![image](https://user-images.githubusercontent.com/75116433/122174622-71e27100-ceb5-11eb-9966-ad2b9c6aab9f.png)

when i use train_net_step.py to train my data, there is always a bug existing. ![image](https://user-images.githubusercontent.com/75116433/122011030-46488380-cdee-11eb-9e84-a8a92edd2285.png)