Preprocess method

[songminjae]

In train.py file, I guess there exists 3 main preprocessing methods.
However, the only one working mehtod is digl.
Are you willing to update the version of "sdrf" and "knn"?

[AdrianArnaiz]

Hi!

First, thanks a lot for reaching out and identifying this bug! The last time I used both sdrf and knn prepros, they were working smoothly. Let me run the code again to see if I have any issue with last modifications or versions and I'll get back to you asap :)

However, the main purpose of this repo is to provide the DiffWire code. Therefore, if you are in a hurry, SDRF prepro comes from the original repo and KNN comes from the original PyG version.