code: public static int nvgraphWidestPath(
          nvgraphHandle handle, 
          nvgraphGraphDescr descrG, 
          long weight_index, 
          Pointer source_vert, 
          long widest_path_index)
      {
          return checkResult(nvgraphWidestPathNative(handle, descrG, weight_index, source_vert, widest_path_index));
      }
docs: nvGRAPH WidestPath
  Find widest path potential from source_index to every other vertices.