docs: public static int nvgraphContractGraph(
          nvgraphHandle handle, 
          nvgraphGraphDescr descrG, 
          nvgraphGraphDescr contrdescrG, 
          Pointer aggregates, 
          long numaggregates, 
          int VertexCombineOp, 
          int VertexReduceOp, 
          int EdgeCombineOp, 
          int EdgeReduceOp, 
          int flag)
      {
          return checkResult(nvgraphContractGraphNative(handle, descrG, contrdescrG, aggregates, numaggregates, VertexCombineOp, VertexReduceOp, EdgeCombineOp, EdgeReduceOp, flag));
      }