使用梯度下降的bp神经网络实现iris数据的分类的java程序，适合初学者-BP neural network using gradient descent to achieve iris data classification of the Java program, suitable for beginners

搭建简单的BP神经网络，对数据进行分类，理解简单的神经网络搭建方法。(A simple BP neural network is built to classify data and understand simple neural network building method.)