Adding a new graph classification dataset

[YingtongDou]

Hi,

I recently curated a graph classification dataset based on PyG dataset API which includes fake/real news propagation graphs on Twitter. Each news propagation graph is a hierarchical tree-structured graph where the root node represents the news, the leaf nodes are Twitter users who retweeted the root news. The paper introducing the dataset is accepted by SIGIR'21.

I would like to know if this new dataset can be added to torch_geometric.datasets since the tree-structured graph is unique and is extracted from real-world data.

[rusty1s]

Sure, nice work! Feel free to send a PR.