[Minor] Fix dependencies.

README.md

@@ -58,6 +58,7 @@ The code is built with following libraries:
 - [torchpack](https://github.com/mit-han-lab/torchpack)
 - [mmcv](https://github.com/open-mmlab/mmcv) = 1.4.0
 - [mmdetection](http://github.com/open-mmlab/mmdetection) = 2.20.0
+- [nuscenes-dev-kit](https://github.com/nutonomy/nuscenes-devkit)
 
 After installing these dependencies, please run this command to install the codebase:
 

mmdet3d/datasets/pipelines/utils.py

@@ -2,11 +2,11 @@ import warnings
 
 import numba
 import numpy as np
-from numba.errors import NumbaPerformanceWarning
+from numba import errors
 
 from mmdet3d.core.bbox import box_np_ops
 
-warnings.filterwarnings("ignore", category=NumbaPerformanceWarning)
+warnings.filterwarnings("ignore", category=errors.NumbaPerformanceWarning)
 
 
 @numba.njit