演化学习具有全局优化性能好，实验样本数要求少等优点，但也存在一些问题，如演化学习的速度较慢、模型的稳定性较差等。
But it has some disadvantages, for example:the rate of evolutional learning is too slow sometimes, and the stability of network is discontented.
由于你未告诉我们具体要求，现另邮寄去样本数册，以使你们对我商品有个总的概念。
Since we are not informed of your specific requirements, we hereby send you, under separate cover, some sample books to give you a general idea of our commodities.
采用基于遗传程序设计方法实现函数自动建模无需预先确立经验模型，只需指定样本数据和精度要求即可获得回归表达式。
The method based on genetic programming to automatic model the function need not to estimate empirical formulas, only need the sample data and accuracy.
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