指数平滑

def solve():
    import numpy as np
    import matplotlib.pyplot as plt
    np.random.seed(____)
    n = ____
    train_size = ____
    time = np.arange(____)
    ts = ____ * time + ____ * np.sin(____ * np.pi * time / ____) + np.random.normal(____, ____, n)
    train, test = ts[:train_size], ts[train_size:]
    alpha = ____
    es = [train[____]]
    for i in range(____, len(____)):
        es.append(alpha * train[i] + (____ - alpha) * es[-____])
    es_pred = np.full(len(____), es[-____])
    plt.figure(figsize=(____, ____))
    plt.plot(____)
    plt.plot(____)
    plt.plot(____)
    plt.plot(____)
    plt.xlabel(____)
    plt.ylabel(____)
    plt.title(____)
    plt.legend()
    plt.grid(____)
    plt.show()