Sizes of tensors must match except in dimension 1. Got 61 and 60 in dimension 2

1. 背景介绍
在训练编码解码网络模型时，出现以下错误：

RuntimeError: Sizes of tensors must match except in dimension 1. Got 61 and 60 in dimension 2

2. 错误产生原因
在模型中有以下操作：torch.cat(x, y)

当x, y的尺寸不一致时，就会出现以上错误。原因是上下采样过程中四舍五入造成的tensor相加尺寸问题，

3. 解决方法
方法1：在图像输入时，宽和高最好是32的整数倍，就不会出现取整的问题。

方法2：把x、y 调整到相同的尺寸。

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