Both - some models are wrapped (like ARIMA & ETS around statsmodels, Prophet around fbprophet) and we write others ourselves (RNNs, TCNs, N-Beats, ...). Basical

Both - some models are wrapped (like ARIMA & ETS around statsmodels, Prophet around fbprophet) and we write others ourselves (RNNs, TCNs, N-Beats, ...). Basically we take a pragmatic approach here, we do whatever is best to use a given model in Darts.