I think filtering and scoring fall under a heuristics based approach to address NP-hardness? Binpacking seems to be a well-defined NP-hard problem: https://en.

I think filtering and scoring fall under a heuristics based approach to address NP-hardness? Binpacking seems to be a well-defined NP-hard problem: https://en.wikipedia.org/wiki/Bin_packing_problem https://en.wikipedia.org/wiki/Bin_packing_problem