[⭐] Add some spectral-temporal GNN models

[bingofisher]

Description of the new feature / enhancement | 您所需的新功能或能力

I‘d like to propose the addition of spatio-temporal graph neural network models to better support forecasting tasks involving dynamic graph-structured time series data, such as STGCN, ASTGCN, etc.

Scenario when this would be used? | 使用场景

time-series forecasting

Supporting information | 附加信息

No response

[yisongfu]

We are currently updating the spatial-temporal forecasting baselines from version 0.5 to the new version. Since we aim to refactor these codes following open-source project standards, this will require considerable effort and time. The baselines will be gradually added over the next month.

[bingofisher]

Thanks for all your hard work! I'm really looking forward to seeing those baselines go live.

[liuyang12a]

How can the inputs of spatial-temporal forecasting shaped with [batch_size, seq_len, features]?
It seems that there is an extra dimension(num_of_nodes) in the data.