SSD报错：The shape of the mask [32, 8732] at index 0does not match the shape of the indexed tenso

IndexError: The shape of the mask [32, 8732] at index 0does not match the shape of the indexed tensor [279424, 1] at index 0

如果出现类似于以上的索引错误，需要将layers/modules/multibox_loss.py 的代码按照下图修改即可。注释掉的是源代码，下面的是新加的，即交换两行代码的顺序即可。

解决了这个问题，又会出现一个新问题：

IndexError: invalid index of a 0-dim tensor. Use tensor.item() to
convert a 0-dim tensor to a Python number

解决方法：将错误行的 .data[0] 修改为 .item() 即可：

 # loc_loss += loss_l.data[0]# conf_loss += loss_c.data[0]loc_loss += loss_l.item()
conf_loss += loss_c.item()

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SSD报错：The shape of the mask [32, 8732] at index 0does not match the shape of the indexed tenso

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