pytorch RuntimeError: size mismatch, m1: [64 x 784], m2: [784 x 10] at
fromtorchimportnnclassMnist_Logistic(nn.Module):def__init__(self):super().__init__()self.lin=nn.Linear(748,10)defforward(self,xb):returnself.lin(xb)print(loss_func(model(xb),yb))出现错误sizemismatch,m1:[6