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Another one: there doesn't seem to be a single test file.

Honestly, this looks like a PoC - Proof of Concept. They've open sourced what used to be a PoC at one point.

Seems like that was the intent: "We have eliminated every single hand-engineered feature and most heuristics from the system"

It seems like what they've released is entirely useless. Just done for the headlines I guess. All the real information is the components not provided. They may as well have uploaded the CPython source and told us that was the algorithm, which executes a hand-engineered model of heuristics stored in a closed-source .py file.

I think the goal is for AI to take over the heuristics. This is basically code for the AI model

Not really that surprising: all logic that used to be in the code is now in the model; the only code that is left is some glue to connect the outside world to the number crunching, just like Llama2 runs your LLMs with only 700 lines of C.

They're eating the code. They're eating the algorithms.