getStaticCost(streamGraph.getStaticSubGraphs()[0], new HashSet());
    public void singleFilterAssignment() {        assert assigned.size() == 1;        assert rawChip.getTotalTiles() == 1;        assert (FlatNode) (assigned.toArray()[0]) == streamGraph            .getStaticSubGraphs()[0].getTopLevel();        assign(rawChip.getTile(0), (FlatNode) (assigned.toArray()[0]));    }