KeyError: unlabeled_train_iter.next() #29

%run /code/train.py --gpu=0 --n-labeled=10 --data-path /yahoo_answers_csv/ --batch-size=4 --batch-size-u=8 --epochs=50 --val-iteration=20 --lambda-u=0 --T=0.5 --alpha=16 --mix-layers-set 7 9 12 --separate-mix=True

train(labeled_trainloader, unlabeled_trainloader, model, optimizer, scheduler, criterion, epoch, n_labels, train_aug)
204 (inputs_u, inputs_u2, inputs_ori), (length_u,
--> 205 length_u2, length_ori) = unlabeled_train_iter.next()
206 except:

/torch/utils/data/dataloader.py in next(self)
520 self._reset()
--> 521 data = self._next_data()
522 self._num_yielded += 1

/torch/utils/data/dataloader.py in _next_data(self)
560 index = self._next_index() # may raise StopIteration
--> 561 data = self._dataset_fetcher.fetch(index) # may raise StopIteration
562 if self._pin_memory:

/torch/utils/data/_utils/fetch.py in fetch(self, possibly_batched_index)
43 if self.auto_collation:
---> 44 data = [self.dataset[idx] for idx in possibly_batched_index]
45 else:

/torch/utils/data/_utils/fetch.py in (.0)
43 if self.auto_collation:
---> 44 data = [self.dataset[idx] for idx in possibly_batched_index]
45 else:

/code/read_data.py in getitem(self, idx)
209 if self.aug is not None:
--> 210 u, v, ori = self.aug(self.text[idx], self.ids[idx])
211 encode_result_u, length_u = self.get_tokenized(u)

/code/read_data.py in call(self, ori, idx)
22 def call(self, ori, idx):
---> 23 out1 = self.de[idx]
24 out2 = self.ru[idx]

KeyError: 9226

May I ask what is the reason for this place? Thank you very much.