Python版本是3.9，飞桨是2.3.2，我运行了教程中飞桨框架关于房价预测模型例子的例子，发现损失函数为什么总是返回0，

# 计算损失
loss = F.square_error_cost(predicts, labels)

epoch: 0, iter: 0, loss is: [0.]
epoch: 0, iter: 20, loss is: [0.]
epoch: 0, iter: 40, loss is: [0.]
epoch: 1, iter: 0, loss is: [0.]
epoch: 1, iter: 20, loss is: [0.]
epoch: 1, iter: 40, loss is: [0.]
epoch: 2, iter: 0, loss is: [0.]
epoch: 2, iter: 20, loss is: [0.]
epoch: 2, iter: 40, loss is: [0.]
epoch: 3, iter: 0, loss is: [0.]
epoch: 3, iter: 20, loss is: [0.]
epoch: 3, iter: 40, loss is: [0.]
epoch: 4, iter: 0, loss is: [0.]
epoch: 4, iter: 20, loss is: [0.]
epoch: 4, iter: 40, loss is: [0.]
epoch: 5, iter: 0, loss is: [0.]
epoch: 5, iter: 20, loss is: [0.]
epoch: 5, iter: 40, loss is: [0.]
epoch: 6, iter: 0, loss is: [0.]
epoch: 6, iter: 20, loss is: [0.]
epoch: 6, iter: 40, loss is: [0.]
epoch: 7, iter: 0, loss is: [0.]
epoch: 7, iter: 20, loss is: [0.]
epoch: 7, iter: 40, loss is: [0.]
epoch: 8, iter: 0, loss is: [0.]
epoch: 8, iter: 20, loss is: [0.]
epoch: 8, iter: 40, loss is: [0.]
epoch: 9, iter: 0, loss is: [0.]
epoch: 9, iter: 20, loss is: [0.]
epoch: 9, iter: 40, loss is: [0.]
模型保存成功，模型参数保存在LR_model.pdparams中

新手，谢谢大神解释