too many values to unpack (expected 4)

[vounteer]

When I run demo_ wild.sh An error occurred
/home/eini/anaconda3/lib/python3.7/site-packages/torch/optim/lr_scheduler.py:82: UserWarning: Detected call of lr_scheduler.step() before optimizer.step(). In PyTorch 1.1.0 and later, you should call them in the opposite order: optimizer.step() before lr_scheduler.step(). Failure to do this will result in PyTorch skipping the first value of the learning rate schedule.See more details at https://pytorch.org/docs/stable/optim.html#how-to-adjust-learning-rate
"https://pytorch.org/docs/stable/optim.html#how-to-adjust-learning-rate", UserWarning)
Traceback (most recent call last):
File "main.py", line 80, in
train(args, configs)
File "main.py", line 46, in train
trainer.train()
File "/home/eini/WZY/open-VehicleReID-master/trainers/base.py", line 72, in train
for i,inputs in enumerate(self.train_loader):
File "/home/eini/anaconda3/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 346, in next
data = self.dataset_fetcher.fetch(index) # may raise StopIteration
File "/home/eini/anaconda3/lib/python3.7/site-packages/torch/utils/data/_utils/fetch.py", line 44, in fetch
data = [self.dataset[idx] for idx in possibly_batched_index]
File "/home/eini/anaconda3/lib/python3.7/site-packages/torch/utils/data/utils/fetch.py", line 44, in
data = [self.dataset[idx] for idx in possibly_batched_index]
File "/home/eini/WZY/open-VehicleReID-master/dataset/preprocessor.py", line 33, in getitem
imgpath, id, cam, fname = self.dataset[index]
ValueError: too many values to unpack (expected 4)

[BravoLu]

You can check the of number of the items of self.dataset