Issue not solved, already it has same line of code

[Sakthi121]

I solved that, just modify line 308 in nuscenes_dataset.py

eval_set_map, from "v1.0-mini": "mini_train" to "v1.0-mini": "mini_val", additionally, the size of either set, train_scenes and val_scenes can not be zero

Originally posted by @tjucwb in #307