Thin plate radial basis function

[Fayeben]

Hi, thanks for your great work!

I have a question about the thin plate radial basis function. Does the following line correspond to the dTPS in the paper? If so, it seems a little different between them?
https://github.com/chenchao15/NeuralTPS/blob/b1150d987a5f268babf5c2d66be0f658813d9135/NeuralTPS.py#L194C23-L194C23

Looking for your response.
Best regards