Build dynamic models with SysIdentPy

                
    from sysidentpy.model_structure_selection import FROLS
    from sysidentpy.basis_function import Polynomial
    from sysidentpy.utils.generate_data import get_siso_data
    
    x_train, x_valid, y_train, y_valid = get_siso_data(
        n=1000, colored_noise=False, sigma=0.0001, train_percentage=90
    )
    
    basis_function = Polynomial(degree=2)
    model = FROLS(ylag=2, xlag=2, basis_function=basis_function)
    
    model.fit(X=x_train, y=y_train)
    yhat = model.predict(X=x_valid, y=y_valid)
                
              

                
    from sysidentpy.model_structure_selection import FROLS
    from sysidentpy.basis_function import Legendre
    from sysidentpy.utils.generate_data import get_siso_data
    
    x_train, x_valid, y_train, y_valid = get_siso_data(
        n=1000, colored_noise=False, sigma=0.0001, train_percentage=90
    )
    
    basis_function = Legendre(degree=2)
    model = FROLS(ylag=2, xlag=2, basis_function=basis_function)
    
    model.fit(X=x_train, y=y_train)
    yhat = model.predict(X=x_valid, y=y_valid)
                
              

                
    from sysidentpy.model_structure_selection import FROLS
    from sysidentpy.basis_function import Fourier
    from sysidentpy.utils.generate_data import get_siso_data
    
    x_train, x_valid, y_train, y_valid = get_siso_data(
        n=1000, colored_noise=False, sigma=0.0001, train_percentage=90
    )
    
    basis_function = Fourier(degree=2)
    model = FROLS(ylag=2, xlag=2, basis_function=basis_function)
    
    model.fit(X=x_train, y=y_train)
    yhat = model.predict(X=x_valid, y=y_valid)
                
              

                
    from torch import nn
    from sysidentpy.neural_network import NARXNN
    
    from sysidentpy.basis_function import Polynomial
    from sysidentpy.utils.generate_data import get_siso_data
    
    x_train, x_valid, y_train, y_valid = get_siso_data(
        n=1000, colored_noise=False, sigma=0.01, train_percentage=80
    )
    
    class NARX(nn.Module):
        def __init__(self):
            super().__init__()
            self.lin = nn.Linear(4, 30)
            self.lin2 = nn.Linear(30, 1)
            self.tanh = nn.Tanh()
    
        def forward(self, xb):
            z = self.lin(xb)
            z = self.tanh(z)
            z = self.lin2(z)
            return z
    
    
    narx_net2 = NARXNN(
        net=NARX(),
        ylag=2,
        xlag=2,
        basis_function=Polynomial(degree=1),
        optimizer="Adam",
        optim_params={
            "betas": (0.9, 0.999),
            "eps": 1e-05,
        },
    )
    
    narx_net2.fit(X=x_train, y=y_train)
    yhat = narx_net2.predict(X=x_valid, y=y_valid)
                
              

                
    from sysidentpy.utils.generate_data import get_siso_data
    from sysidentpy.general_estimators import NARX
    from sklearn.linear_model import BayesianRidge
    from sysidentpy.basis_function import Polynomial
    
    x_train, x_valid, y_train, y_valid = get_siso_data(
        n=1000, colored_noise=False, sigma=0.0001, train_percentage=90
    )
    
    BayesianRidge_narx = NARX(
        base_estimator=BayesianRidge(),
        xlag=2,
        ylag=2,
        basis_function=Polynomial(degree=2),
        model_type="NARMAX",
    )
    
    BayesianRidge_narx.fit(X=x_train, y=y_train)
    yhat = BayesianRidge_narx.predict(X=x_valid, y=y_valid)
                
              

                
    from catboost import CatBoostRegressor
    from sysidentpy.utils.generate_data import get_siso_data
    from sysidentpy.general_estimators import NARX
    from sysidentpy.basis_function import Polynomial
    
    x_train, x_valid, y_train, y_valid = get_siso_data(
        n=1000, colored_noise=False, sigma=0.0001, train_percentage=90
    )
    
    catboost_narx = NARX(
        base_estimator=CatBoostRegressor(
            iterations=300,
            learning_rate=0.1
        ),
        xlag=2,
        ylag=2,
        basis_function=Polynomial(degree=2),
        model_type="NARMAX",
        fit_params={"verbose": False},
    )
    
    catboost_narx.fit(X=x_train, y=y_train)
    yhat = catboost_narx.predict(X=x_valid, y=y_valid, steps_ahead=None)