Muti step ahead prediction using closed loop NARX problem!!

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musa butt
musa butt 2021-5-2
Hello,
I am working on a multivariate time series forecasting task for which i have trainned a NARX network which gives me quite good results,after training the model from nntool i export the model which i assumes is the open loop model,now for multistep ahead forecast i convert it in closed loop NARX but the performace for this model is drasticaly bad.How i can forecast with such poor model kindly help me in this regard.
1)How the close loop model performance be improved?
2)How i can use my close loop model to forecast the unknown targets?

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