What do the py files in dgl and pyg mean? And how can I use lcat to directly perform node classification tasks? What should be the effect of pytest's successful test?

[zjj1333]

Thank you for sharing such excellent work.
What do the py files in dgl and pyg mean?
And how can I use lcat to directly perform node classification tasks?
What should be the effect of pytest's successful test?

[py-zhai]

同问，不知道怎么使用这份代码，有具体完整的使用过程可以分享吗？