Function auto_device 

pub fn auto_device() -> Result<Device>

Returns the default device for the active backend.

• Without cuda feature: returns Flex (CPU) device.
• With cuda feature: returns CUDA device (GPU 0).

use multiscreen_rs::prelude::*;
fn main() -> multiscreen_rs::Result<()> {
    let device = auto_device()?;
    Ok(())
}