code: func (d Device) MinorNumber() (uint, error) {
  	if C.nvmlHandle == nil {
  		return 0, errLibraryNotLoaded
  	}
  	var n C.uint
  	r := C.nvmlDeviceGetMinorNumber(d.dev, &n)
  	return uint(n), errorString(r)
  }
docs: // MinorNumber returns the minor number for the device.
  // The minor number for the device is such that the Nvidia device node
  // file for each GPU will have the form /dev/nvidia[minor number].