Nvidia-uvm: Loaded the UVM driver, major device number 511

Gaming and Visualization Technologies General Topics and Other SDKs Drivers - Linux, Windows, MacOS
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When training deeplearing tasks, sockets always disappear for some reason. By reading nvidia-bug-report, here are the logs corespounding to the time sockets disappear. I want to know what causes this.
[ 14.638487] [drm] [nvidia-drm] [GPU ID 0x00001a00] Loading driver

[ 14.638489] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:1a:00.0 on minor 1

[ 14.638594] [drm] [nvidia-drm] [GPU ID 0x00001b00] Loading driver

[ 14.638595] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:1b:00.0 on minor 2

[ 14.638662] [drm] [nvidia-drm] [GPU ID 0x00003d00] Loading driver

[ 14.638662] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:3d:00.0 on minor 3

[ 14.638727] [drm] [nvidia-drm] [GPU ID 0x00003e00] Loading driver

[ 14.638728] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:3e:00.0 on minor 4

[ 14.638792] [drm] [nvidia-drm] [GPU ID 0x00008800] Loading driver

[ 14.638793] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:88:00.0 on minor 5

[ 14.638869] [drm] [nvidia-drm] [GPU ID 0x00008900] Loading driver

[ 14.638870] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:89:00.0 on minor 6

[ 14.638952] [drm] [nvidia-drm] [GPU ID 0x0000b100] Loading driver

[ 14.638953] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:b1:00.0 on minor 7

[ 14.639011] [drm] [nvidia-drm] [GPU ID 0x0000b200] Loading driver

[ 14.639012] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:b2:00.0 on minor 8

[15847.720644] nvidia-uvm: Loaded the UVM driver, major device number 511.