将260个样本中随机抽出部分学生的身高和体重作为训练样本（男女生都有），然后训练一个BP神经网络，最后将剩下的样本输入网络进行测试，检测BP网络的分类性能。260个样本的体重和身高在文档中。可以在男生样本中抽取70%用来训练，在女生样本中抽取70%用来训练。(The 260 samples were randomly selected from the part of the students' height and weight as the training sample (boys and girls), and then train a BP neural network, and finally the rest of the network input samples for testing, performance testing of BP network classification. The weight and height of the 260 samples are in the document. A sample of 70% can be used for training, and 70% for girls to be trained.)