[Python / numpy] AttributeError: module 'numpy' has no attribute 'long' の対策

AttributeError: module 'numpy' has no attribute 'long' というエラーが発生したので対処した。

1. 前提 / 環境情報

以下の環境で発生

item	version
Ubuntu	20.04.6 LTS
Python	3.8.20
mmdet3d (mmdetection3d)	0.17.2
numba	0.48.0
numpy	1.24.4

2. エラー発生状況

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/work_dir/MapTR/projects/mmdet3d_plugin/__init__.py", line 5, in <module>
    from .datasets.pipelines import (
  File "/work_dir/MapTR/projects/mmdet3d_plugin/datasets/__init__.py", line 1, in <module>
    from .nuscenes_dataset import CustomNuScenesDataset
  File "/work_dir/MapTR/projects/mmdet3d_plugin/datasets/nuscenes_dataset.py", line 5, in <module>
    from mmdet3d.datasets import NuScenesDataset
  File "/work_dir/MapTR/mmdetection3d/mmdet3d/datasets/__init__.py", line 4, in <module>
    from .custom_3d import Custom3DDataset
  File "/work_dir/MapTR/mmdetection3d/mmdet3d/datasets/custom_3d.py", line 10, in <module>
    from ..core.bbox import get_box_type
  File "/work_dir/MapTR/mmdetection3d/mmdet3d/core/__init__.py", line 4, in <module>
    from .evaluation import *  # noqa: F401, F403
  File "/work_dir/MapTR/mmdetection3d/mmdet3d/core/evaluation/__init__.py", line 3, in <module>
    from .kitti_utils import kitti_eval, kitti_eval_coco_style
  File "/work_dir/MapTR/mmdetection3d/mmdet3d/core/evaluation/kitti_utils/__init__.py", line 2, in <module>
    from .eval import kitti_eval, kitti_eval_coco_style
  File "/work_dir/MapTR/mmdetection3d/mmdet3d/core/evaluation/kitti_utils/eval.py", line 4, in <module>
    import numba
  File "/usr/local/lib/python3.8/site-packages/numba/__init__.py", line 15, in <module>
    from . import config, errors, _runtests as runtests, types
  File "/usr/local/lib/python3.8/site-packages/numba/types/__init__.py", line 110, in <module>
    long_ = _make_signed(np.long)
  File "/usr/local/lib/python3.8/site-packages/numpy/__init__.py", line 320, in __getattr__
    raise AttributeError("module {!r} has no attribute "
AttributeError: module 'numpy' has no attribute 'long'

3. 解決策

pip install numpy==1.23.0

どうやら、 numpy が新しすぎたため、古いライブラリが依存している long という属性が使えなくてエラーが出ていたらしい。