When I use pytorch to fine-tune a VGG model in the Stanford Dogs dataset, a mistake accur:
Traceback (most recent call last):
File “/home/zyd/PycharmProjects/Dog Breed Identification/train.py”, line 237, in 
train_stanford()
File “/home/zyd/PycharmProjects/Dog Breed Identification/train.py”, line 148, in train_stanford
for idx, (images, labels) in enumerate(data_loader):
File “/home/zyd/anaconda3/lib/python3.6/site-packages/torch/utils/data/dataloader.py”, line 286, in next
return self._process_next_batch(batch)
File “/home/zyd/anaconda3/lib/python3.6/site-packages/torch/utils/data/dataloader.py”, line 307, in _process_next_batch
raise batch.exc_type(batch.exc_msg)
KeyError: ‘Traceback (most recent call last):\n  File “/home/zyd/anaconda3/lib/python3.6/site-packages/torch/utils/data/dataloader.py”, line 57, in _worker_loop\n    samples = collate_fn([dataset[i] for i in batch_indices])\n  File “/home/zyd/anaconda3/lib/python3.6/site-packages/torch/utils/data/dataloader.py”, line 57, in \n    samples = collate_fn([dataset[i] for i in batch_indices])\n  File “/home/zyd/PycharmProjects/Dog Breed Identification/dataset.py”, line 157, in getitem\n    label_idx = label_map[image_name]\nKeyError: ‘shih’\n’
and I have no idea how it comes