have you tried SNAP datasets? https://snap.stanford.edu/data/

feel free to contact xiebiwei at ict.ac.cn

Thank you, Biwei Xie!

I have taken a look at the SNAP datasets, but almost datasets are represented by node-labeled graphs. Some graph datasets contain edge-labeled with "a number", but what I need is the graphs with an edge labeled by "a category" (a string). For example, we consider a social network as a graph database, where a node represents a person, an edge represents a relationship between two people by a label such as "friend", "parent", or "colleague".

Maybe I need to convert some node-labeled graphs into edge-labeled graphs.

Did you find any attributed graphs? I am looking to work on attributed graph stream. Please let me know if you have any dataset you know of.