Function xsyev_batched_buffer_size 

pub fn xsyev_batched_buffer_size<TA: DataTypeLike, TW: DataTypeLike>(
    ctx: &Context,
    params: &Params,
    mode: EigenMode,
    fill_mode: FillMode,
    n: usize,
    a: MatrixRef<'_, TA>,
    w: &DeviceMemory<TW>,
    batch_count: usize,
) -> Result<WorkspaceSizes>