神经网络是一组连接的输入/输出单元，其中每个连接都与一个权重相关联。在学习阶段，通过调整这些权重，能够预测输入元素的正确类标号(A neural network is a set of connected input/output units, where each connection is associated with a weight. In the learning phase, by adjusting these weights, the correct class label of the input element can be predicted)