invalid argument 0: Sizes of tensors must match except in dimension 0. Got 1

原因：dataloader 需要的数据维度是一样的，有的有两个目标，有的有一个目标，就会出现异常：

解决方法：凑成一样的。

Traceback (most recent call last):
File "G:/project/facebox/faceboxes/tools/convert_tenser.py", line 116, in <module>
gen_data(batch_size,data_path,target_path)
File "G:/project/facebox/faceboxes/tools/convert_tenser.py", line 30, in gen_data
for step, samples in enumerate(dataloader):
File "D:\ProgramData\Miniconda3\lib\site-packages\torch\utils\data\dataloader.py", line 314, in __next__
batch = self.collate_fn([self.dataset[i] for i in indices])
File "D:\ProgramData\Miniconda3\lib\site-packages\torch\utils\data\dataloader.py", line 184, in default_collate
return {key: default_collate([d[key] for d in batch]) for key in batch[0]}
File "D:\ProgramD

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