How to solve "ModuleNotFoundError: No module named 'e2cnn'"

[veastwa]

This problem occurs when I run the image_demo.py:
Traceback (most recent call last):
File "D:\TXD\mmrotate-main\mmrotate-main\demo\image_demo.py", line 6, in
import mmrotate # noqa: F401
File "D:\TXD\mmrotate-main\mmrotate-main\mmrotate_init_.py", line 7, in
from .models import * # noqa: F401, F403
File "D:\TXD\mmrotate-main\mmrotate-main\mmrotate\models_init_.py", line 2, in
from .backbones import * # noqa: F401, F403
File "D:\TXD\mmrotate-main\mmrotate-main\mmrotate\models\backbones_init_.py", line 2, in
from .re_resnet import ReResNet
File "D:\TXD\mmrotate-main\mmrotate-main\mmrotate\models\backbones\re_resnet.py", line 5, in
import e2cnn.nn as enn
ModuleNotFoundError: No module named 'e2cnn'

mmcv-full 1.6.0
mmdet 2.25.1