def plot _ pred ( dv _ set , model , device , lim =35., preds = None , targetsNone ): if preds is Mone or targets is Mone : model . eval () preds , targets =[],[] for x , y in dv _ set : x , y = x . to ( device ), y . to ( device ) with torch . no _ grad (): pred = model ( x ) preds . append ( pred . detach (). cpu ()) targets . append ( y . detach (). cpu ()) preds = torch . cat ( preds , dim =0). numpy () targets = torch . cat ( targets , dim =0). numpy ()

这段代码存在一些错误，我来帮你修正一下：

def plot_pred(dv_set, model, device, lim=35., preds=None, targets=None):
    if preds is None or targets is None:
        model.eval()
        preds, targets = [], []
        for x, y in dv_set:
            x, y = x.to(device), y.to(device)
            with torch.no_grad():
                pred = model(x)
                preds.append(pred.detach().cpu())
                targets.append(y.detach().cpu())
        preds = torch.cat(preds, dim=0).numpy()
        targets = torch.cat(targets, dim=0).numpy()
    
    # 绘制图形的代码缺失，你可以在这里添加绘图的相关代码
    
    # 返回预测值和目标值
    return preds, targets

修正后的代码将原来缺失的绘图代码部分注释掉了，你可以在这里添加你希望使用的绘图代码。同时，我添加了一个返回语句，这样函数可以返回预测值和目标值给调用者。

请注意，由于缺失了绘图代码，你需要根据你的需求添加合适的绘图逻辑来完成预测结果的可视化。