Unrecognized layer type CustomConv. How to customize the convolution layer in mmsegmentation?

[2019xiaoluo]

mmcv-full 1.7.2
mmsegmentation 0.30.0
I want to modify a custom convolution layer

In the following figure, I defined a class in mmseg and registered it with mmcv.

debug also shows that I have entered the annotation location, but when I tried to use it, the class was still not found in the register

CONV_LAYERS = Registry('conv layer')

Does the mmsegmentation not have a custom convolutional layer that can only be defined in the mmcv source code and installed locally?