questions about subgraph implementation

[ImCabbage]

Hi,
Great implementation of VectorNet. I have one doubt about the subgraph part. The subgraph is stacked in a row to encoding the features. Then why there is a hidden unit coded in this part. From the perspective of the paper, should't the dimensions keeps the same? What is the benefits?

[Henry1iu]

Hi,

Thanks for your appreciation. Could you please explain what you mean by "a hidden unit"?

Best Regards,
Henry

[ImCabbage]

In the implementaion of subgraph, I see the "in_channels" variable is set as two times of hidden_unit, and at end step, you have one more linear layer added which is not mentioned in the paper. I just wanna know what is the idea behind such design.

[Henry1iu]

The idea came from the bottleneck of the Resnet block.