Function launch 

pub fn launch<R: Runtime, AP: AttentionPrecision>(
    strategy: &Strategy,
    client: &ComputeClient<R::Server>,
    query: TensorHandle<R, QG<AP>>,
    key: TensorHandle<R, KG<AP>>,
    value: TensorHandle<R, VG<AP>>,
    mask: Option<TensorHandle<R, MSK<AP>>>,
    out: TensorHandle<R, OG<AP>>,
) -> Result<(), AttentionSetupError>