make exp3 works but no check

exp1/modified.py

@@ -66,8 +66,8 @@ def main():
 
     for t in range(2000):
         optimizer.zero_grad()  #清空上一步的残余更新参数值
-        prediction: torch.Tensor = net(test_data.x)  #喂给net训练数据x，输出预测值
-        loss: torch.Tensor = loss_func(prediction, test_data.y)  #计算两者的误差
+        prediction: torch.tensor = net(test_data.x)  #喂给net训练数据x，输出预测值
+        loss: torch.tensor = loss_func(prediction, test_data.y)  #计算两者的误差
         loss.backward()  #误差反向传播，计算参数更新值
         optimizer.step()  #将参数更新值施加到net的parameters上