[GRAPH] Reduce NCCL_TOPO_MAX_NODES to 64 (#1153)

Signed-off-by: nileshnegi <Nilesh.Negi@amd.com>

src/include/graph.h

@@ -66,7 +66,7 @@ ncclResult_t ncclTopoGetLocalNet(struct ncclTopoSystem* system, int rank, int ch
 ncclResult_t ncclTopoGetLocalGpu(struct ncclTopoSystem* system, int net, int* gpuIndex);
 ncclResult_t getLocalNetCountByBw(struct ncclTopoSystem* system, int gpu, int *count);
 
-#define NCCL_TOPO_MAX_NODES 256
+#define NCCL_TOPO_MAX_NODES 64
 
 // Init search. Needs to be done before calling ncclTopoCompute
 ncclResult_t ncclTopoSearchInit(struct ncclTopoSystem* system);