既然模型的预测能力如此之小，那它们有什么用呢？
If models have so little predictive power, what use are they?
前言：目的：探讨模型对未知样本的预测能力的优劣。
Objective: to explore the predicting ability of model to unknown samples.
实验结果表明该模型具有较好的逼近能力，预测效果良好。
Experiment show the model have the preferable approach ability and predication performance.
实验结果表明该模型具有较好的逼近能力，预测效果良好。
Experiment show the model have the preferable approach ability and predication performance.
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