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1. 3x3的时候会有重复
1. 重复的权重，虽然权重看起来都一样，但是有稍微的不同，不是完全一样
2. 3x3太小了导致了样本的信噪比太低，大部分的样本切出来都是0
2. 5x5的时候会有网格状重复
3. 7x7的时候边框区域问题
1. 输入的信噪比
2. loss函数的设计
3. grad信息的应用