Load gdata.pkl with PyG version>2

[NYXFLOWER]

The kgdata.pkl is generated using PyG v1.4.2, therefore it is not able to load when using a PyG version >2.

If you are using the PyG with a version > 2, use the following steps to load the input data of APRILE:

• download the kgdata_dict.pkl, whose data type is Dictionary.
• load data and convert it to PyG Data type.

from torch_geometric.data import Data

# load data from file
gdata = AprileQuery.load_from_pkl('kgdata_dict.pkl')
# convert data type  to PyG Data
gdata = Data.from_dict(gdata)

[NYXFLOWER]

@all-contributors please add @laurenceyang33 for doc and test

[allcontributors]

@NYXFLOWER

I've put up a pull request to add @laurenceyang33! 🎉