Update README.md

README.md

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 The goal of this repository is to store the different graph datasets currently available as benchmarks, to provide them in an homogeneous and easily loadable way. For example, to load them in PyGeometric, you can do the following:
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 ```python
 from datasets import load_dataset
 
@@ -20,7 +21,7 @@ graphs_list = [Data(graph) for graph in graphs_dataset["train"]]
 graphs_pygeometric = DataLoader(graph_list)
 ```
 
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 Currently available graphs are:
 
 <strong> Open Graph Benchmark </strong>, graph classification task: <em> ogbg-molhiv, ogbg-molpcba, ogbg-ppa, ogbg-code2 </em>