Simplify Usage Instructions for Dataset Processing and Training

[Takaogahara]

Thanks a ton for your contribution! Your work is awesome.

I'm currently trying out some few-shot methods with graphs, but I'm having trouble navigating the repository.
Any chance you could update the README with user-friendly instructions? Like, how to process and load a dataset, and simple training?

Your help would be great! Appreciate it!

[crisostomi]

Hi Takaogahara, thanks for bringing this up!

It's been quite a bit since I worked on this project but I tried to update the readme nevertheless :)
It seems to work for me by following current instructions, at least the distance metric learning baseline. Changing dataset should be as easy as changing the string in cfg.nn.data with one of the files in conf/nn/data/.
I haven't had the time to test the other scripts, but please let me know if you encounter any problems and I'll try to give it a look.

Best regards,
D.