Setting a random seed

[ninell-oldenburg]

Hi!

I'm trying to find a place to set a random seed for the initial substrate setting. However, all places I've tried so far seem to do it, and I was wondering if an interface exists anywhere in the code.

Things I've tried:

• meltingpot/lua/modules/api_factory.lua + removing random:seed() calls
• meltingpot/python/configs/substrates/clean_up.py (as an example) + adding an env_seed to the build() function.
• meltingpot/python/substrate.py + adding an env_seed to the build function + all dependencies.

Thanks in advance!

[jagapiou]

There are multiple random seeds:

1. dmlab2d.Lab2d (pybind C++) takes a seed in the lab2d_settings_dict that is passed to Lua (see here).
2. dmlab2d.Environment takes a seed for it's Python/C++
3. Stuff in the scenarios and the bots that I don't think a relevant here.

1 & 2 should be controllable by the env_seed argument. However, this isn't wired in.

I've discussed this at https://github.com/deepmind/meltingpot/issues/113#issuecomment-1462212082 there may be more relevant info there on what solution to take (e.g. seed in a config, as an override to build, as an argument to reset()).

[ninell-oldenburg]

Amazing, thank you! Wired it in.