Architecture layers

[ghost]

what are the main architecture layers of Quadtrix.cpp

[Eamon2009]

I like to divide it in four layers

1. User Interface — React + frontend with PWA assets and a service worker
2. API Layer — FastAPI app in backend/ handling sessions
3. Model Backends — the C++ executable (main.cpp + include/) and the PyTorch checkpoint (engine/inference.py)
4. Training & Data — character-level C++ training from data/input.txt and GPT-2 BPE PyTorch training from engine/input.txt.