报错：RuntimeError: Expected object of backend CUDA but got backend CPU for argument #3 'index'

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    RuntimeError: Expected object of backend CUDA but got backend CPU for argument #3 'index'
    分析：data数据或者model没有调用.to(device)
    解决：
        # 进行可用设备检测, 有GPU的话将优先使用GPU
        device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
        model = model.to(device) 或 model = model.cuda(device)
        output = model(input.to(device)) 或 output = model(input.cuda(device))
        # 选择损失函数, 这里选择预定义的交叉熵损失函数
        criterion = torch.nn.CrossEntropyLoss().to(device) 或 criterion = torch.nn.CrossEntropyLoss().cuda(device)
        loss = criterion(output, lable.to(device)) 或 loss = criterion(output, lable.cuda(device))