Allow intranode use of network connection (#383)

* Allow intranode use of network connection

* Checking for graph for null pointer

src/include/graph.h

@@ -33,6 +33,7 @@ ncclResult_t ncclTopoGetNvbGpus(struct ncclTopoSystem* system, int rank, int* nr
 ncclResult_t ncclTopoGetNetDev(struct ncclTopoSystem* system, int rank, struct ncclTopoGraph* graph, int channelId, int rr, int* net);
 ncclResult_t ncclTopoCheckP2p(struct ncclTopoSystem* system, int64_t id1, int64_t id2, int* p2p, int *read, int* intermediateRank);
 ncclResult_t ncclTopoCheckGdr(struct ncclTopoSystem* topo, int64_t busId, int netDev, int read, int* useGdr);
+ncclResult_t ncclTopoGetIntraNetDev(struct ncclTopoSystem* system, int rank, struct ncclTopoGraph* graph, int channelId, int type, int* dev);
 
 // Set CPU affinity
 ncclResult_t ncclTopoSetAffinity(struct ncclTopoSystem* system, int rank);
@@ -78,6 +79,8 @@ struct ncclTopoGraph {
   int nHops;
   int intra[MAXCHANNELS*NCCL_TOPO_MAX_NODES];
   int inter[MAXCHANNELS*2];
+  int nIntraChannels;
+  int intraNets[MAXCHANNELS*NCCL_TOPO_MAX_NODES*2];
 };
 ncclResult_t ncclTopoCompute(struct ncclTopoSystem* system, struct ncclTopoGraph* graph);