# 1.2 为什么神经网络会流行？(Why is Deep Learning taking off?)

![](/files/-Le0cUY9j-VYDVAZq5Sf)

红色曲线代表了传统机器学习算法的表现，例如是SVM，logistic regression，decision tree等。当数据量比较小的时候，传统学习模型的表现是比较好的。当数据量很大的时候，其性能基本趋于水平

构建一个深度学习的流程是首先产生Idea，然后将Idea转化为Code，最后进行Experiment。接着根据结果修改Idea，继续这种Idea->Code->Experiment的循环，直到最终训练得到表现不错的深度学习网络模型

![](/files/-Le0cUYBIhmCc55eKwLB)![](/files/-Le0cUYD4C_nm_Pq3Hsc)


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