基于Django Prophet的用户购买行为预测模型的构建和调优

pip install Django
pip install fbprophet

from fbprophet import Prophet

def build_model():
    # 从数据库中获取所有用户的购买数据
    purchases = Purchase.objects.all()

    # 为Prophet模型准备数据
    data = []
    for purchase in purchases:
        data.append({'ds': purchase.purchase_time, 'y': purchase.purchase_amount})

    # 创建Prophet模型实例
    model = Prophet()

    # 训练模型
    model.fit(data)

    return model

def evaluate_model(model):
    # 从数据库中获取所有用户的购买数据
    purchases = Purchase.objects.all()

    # 为Prophet模型准备数据
    data = []
    for purchase in purchases:
        data.append({'ds': purchase.purchase_time, 'y': purchase.purchase_amount})

    # 模型评估
    future = model.make_future_dataframe(periods=365)  # 预测未来一年的数据
    forecast = model.predict(future)

    # 计算误差
    forecast = forecast[['ds', 'yhat']]
    forecast.columns = ['ds', 'y']
    errors = forecast.set_index('ds').subtract(data.set_index('ds'))

    return errors

def tune_model(model):
    # 对模型进行调优
    model.add_seasonality(name='monthly', period=30.5, fourier_order=5)  # 添加月度周期
    model.add_seasonality(name='weekly', period=7, fourier_order=3)  # 添加周度周期
    model.fit(data)

    return model