Detail about DGL multiple GPUs training

I am learning GNN recently and i found a figure about DGL multiple GPUs training in github. But I can not find related documents or codes. So i want to ask the result of the figure is training in which dataset? And Is there any open source code?
image

For now, we only release the GraphSage code example:
here:https://github.com/dmlc/dgl/blob/master/examples/pytorch/graphsage/train_sampling_multi_gpu.py