run topology sample error

[lengrongfu]

i in the having nvlink gpu node, run sample dir topology file, but can't true get nvlink type,
expect topology is:

            GP0      GP1      GP2     GP3
GP0     X          NV2      NV1      NV2
GP1.    NV2     X           NV2      NV2
GP2    NV1.     NV2      X          NV1
GP3    NV2     NV2      NV1      X

but got is:

            GP0      GP1      GP2     GP3
GP0     X          N/A      N/A      N/A
GP1.    N/A     X           N/A      N/A
GP2    N/A.     N/A      X          N/A
GP3    N/A     N/A      N/A      X