docs: public static <K> Graph<K, NullValue, NullValue> fromTuple2DataSet(DataSet<Tuple2<K, K>> edges,
  			ExecutionEnvironment context) {
  
  		DataSet<Edge<K, NullValue>> edgeDataSet = edges
  			.map(new Tuple2ToEdgeMap<>())
  				.name("To Edge");
  
  		return fromDataSet(edgeDataSet, context);
  	}