指数平滑

def solve():
    import numpy as np
    import warnings
    warnings.filterwarnings(____)
    from statsmodels.tsa.holtwinters import SimpleExpSmoothing
    np.random.seed(____)
    y = np.cumsum(np.random.randn(____)) + ____
    model = SimpleExpSmoothing(____).fit(____)
    forecast = model.forecast(____)
    print(len(____))