Why "--homooligomer 1" is used in the submit_example_6.sh of ProteinMPNN for homo-dimer and homo-trimer proteins?

[lanselibai]

The submit_example_6.sh of ProteinMPNN designs homo-dimer and homo-trimer proteins
https://github.com/dauparas/ProteinMPNN/blob/main/examples/submit_example_6.sh

What is the meaning of --homooligomer 1?

Similarly, "--homo_oligomer 1" is used in the LigandMPNN. What is the meaning of "1" here?
https://github.com/dauparas/LigandMPNN?tab=readme-ov-file

python run.py \
        --model_type "ligand_mpnn" \
        --seed 111 \
        --pdb_path "./inputs/4GYT.pdb" \
        --out_folder "./outputs/homooligomer" \
        --homo_oligomer 1 \
        --number_of_batches 2