Function apply_multilevel_tiling 

pub fn apply_multilevel_tiling(
    graph: &mut EinsumGraph,
    l1_tiles: &[usize],
    l2_tiles: &[usize],
    l3_tiles: &[usize],
) -> Result<TilingResult, IrError>

Apply multi-level tiling (L1, L2, L3 cache hierarchy).