Need Extra Graph Data Preprocess?

[WendyCui1018]

Hi,
I noticed that the input of the graph data seems not the same as the format of the datasets provided on website: https://ls11-www.cs.tu-dortmund.de/staff/morris/graphkerneldatasets, where each dataset has several txt files. According to the code, I found there are two ways to read a graph, but I think neither of them can directly deal with the original input of the data from the above website. Is it true that a preprocess of the dataset is ignored/missing in the code, or I had a misunderstanding of the code?
Thanks!