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[spcrobocar]

When I prepared the data, I got the following error. How can I fix it?

python tools/create_data.py nuscenes --root-path ./data --out-dir ./data --extra-tag nuscenes --version v1.0 --canbus ./data Traceback (most recent call last): File "tools/create_data.py", line 6, in from data_converter.create_gt_database import create_groundtruth_database File "/.../apps/MapTR/tools/data_converter/create_gt_database.py", line 6, in from mmcv.ops import roi_align File ".../anaconda3/envs/maptr/lib/python3.8/site-packages/mmcv/ops/init.py", line 2, in from .assign_score_withk import assign_score_withk File ".../anaconda3/envs/maptr/lib/python3.8/site-packages/mmcv/ops/assign_score_withk.py", line 5, in ext_module = ext_loader.load_ext( File ".../anaconda3/envs/maptr/lib/python3.8/site-packages/mmcv/utils/ext_loader.py", line 13, in load_ext ext = importlib.import_module('mmcv.' + name) File ".../anaconda3/envs/maptr/lib/python3.8/importlib/init.py", line 127, in import_module return _bootstrap._gcd_import(name[level:], package, level) ModuleNotFoundError: No module named 'mmcv._ext'