code: func (d Device) Temperature() (uint, error) {
  	if C.nvmlHandle == nil {
  		return 0, errLibraryNotLoaded
  	}
  	var n C.uint
  	r := C.nvmlDeviceGetTemperature(d.dev, C.NVML_TEMPERATURE_GPU, &n)
  	return uint(n), errorString(r)
  }
docs: // Temperature returns the temperature for this GPU in Celsius.