in_channels meaning in cfg

[haonan-duan]

Hello, thanks for your amazing project!

I want to use pretrained PointNeXt-XL model to extract point cloud features in my task. I am wondering what is the meaning of in_channels in cfg? I just found in_channels can be modified to any number even I have loaded the pretrained model, and its value is set to be 4 in default in every cfg file. Shouldn't input point clouds have 3 channels? And is there any influenece if I change in_channels from 4 to be 3? Thanks for your help!

[HuayuanSong]

To my knowledge, the 4th input channel stems from the data augmentation, specifically, the height appending operation -'heights' that you can see being passed under the 'feature_keys' param in https://github.com/guochengqian/PointNeXt/blob/master/cfgs/shapenetpart/default.yaml .