The real thing will be some mix of your code and the library's code, and in cases like this where you'd be writing all your logic in Python vs Golang, that will

The real thing will be some mix of your code and the library's code, and in cases like this where you'd be writing all your logic in Python vs Golang, that will have a significant effect on the results. A while back I implemented a game rules engine and MCTS in Torch (the Lua library). The training loop spent like half of its time running the rules engine. Writing it in Python would have been a disaster in comparison. To really make good use of the hardware and spend more time in the optimized machine learning code provided by libraries, one would have to write their rules engine in some language other than Lua or Python.