Exception: Insufficient initial conditions elements!

[rabiu42000]

I get this exception when i use model.fit(x_train, y_train, x_valid, y_valid) for MetaMSS same with FROLS. What causes this kind of exception?
\sysidentpy\polynomial_basis\narmax.py", line 559, in _model_prediction
raise Exception("Insufficient initial conditions elements!")

[wilsonrljr]

Hi @rabiu42000!

Are you using the old api (from sysidentpy.polynomial_basis import MetaMSS)?

And how many samples x_valid and y_valid have?