支持长方形输入

[Enlion91]

模型输出和训练时，配置输入只能是正方形，若要输出长方形则需要修改源码，希望再配置策可以直接支持。 If this is your first time, please read our contributor guidelines: 如果这是您第一次提交请先阅读我们提供的贡献指南 https://gitee.com/mindspore/mindspore/blob/master/CONTRIBUTING.md

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