Embedding index getting out of range while running onlplab/alephbert-base model
## Environment info
- Platform: Google colab 

## Information

Model I am using: 'onlplab/alephbert-base'

The problem arises when using:
 [* ] the official example scripts: 
I tried to implement the code written in your official course (https://huggingface.co/course/chapter7/7?fw=pt)
When the only change I want to make is to replace the model with an  'onlplab/alephbert-base'.
I mean I want to do a finetuning question answering to the  'onlplab/alephbert-base'.

The tasks I am working on is:
 [ *] an official task: SQUaD


## To reproduce

Steps to reproduce the behavior:

1.Run the script:

      
      !pip install datasets transformers[sentencepiece]
      !pip install accelerate
      !apt install git-lfs
      
      from huggingface_hub import notebook_login
      from datasets import load_dataset
      from transformers import AutoTokenizer,BertTokenizerFast
      from transformers import AutoModelForQuestionAnswering, BertForQuestionAnswering
      import collections
      import numpy as np
      from datasets import load_metric
      from tqdm.auto import tqdm
      from transformers import TrainingArguments
      from transformers import Trainer
      from transformers import pipeline
      import torch
      
      raw_datasets = load_dataset("squad")
      raw_datasets["train"].filter(lambda x: len(x["answers"]["text"]) != 1)
      
      # model_checkpoint = "bert-base-cased"
      model_checkpoint = "onlplab/alephbert-base"
      
      # tokenizer = AutoTokenizer.from_pretrained(model_checkpoint)
      tokenizer = BertTokenizerFast.from_pretrained(model_checkpoint)
      
      context = raw_datasets["train"][0]["context"]
      question = raw_datasets["train"][0]["question"]
      
      inputs = tokenizer(question, context)
      tokenizer.decode(inputs["input_ids"])
      
      max_length = 384
      stride = 128
      
      
      def preprocess_training_examples(examples):
          questions = [q.strip() for q in examples["question"]]
          inputs = tokenizer(
              questions,
              examples["context"],
              max_length=max_length,
              truncation="only_second",
              stride=stride,
              return_overflowing_tokens=True,
              return_offsets_mapping=True,
              padding="max_length",
          )
      
          offset_mapping = inputs.pop("offset_mapping")
          sample_map = inputs.pop("overflow_to_sample_mapping")
          answers = examples["answers"]
          start_positions = []
          end_positions = []
      
          for i, offset in enumerate(offset_mapping):
              sample_idx = sample_map[i]
              answer = answers[sample_idx]
              start_char = answer["answer_start"][0]
              end_char = answer["answer_start"][0] + len(answer["text"][0])
              sequence_ids = inputs.sequence_ids(i)
      
              # Find the start and end of the context
              idx = 0
              while sequence_ids[idx] != 1:
                  idx += 1
              context_start = idx
              while sequence_ids[idx] == 1:
                  idx += 1
              context_end = idx - 1
      
              # If the answer is not fully inside the context, label is (0, 0)
              if offset[context_start][0] > end_char or offset[context_end][1] < start_char:
                  start_positions.append(0)
                  end_positions.append(0)
              else:
                  # Otherwise it's the start and end token positions
                  idx = context_start
                  while idx <= context_end and offset[idx][0] <= start_char:
                      idx += 1
                  start_positions.append(idx - 1)
      
                  idx = context_end
                  while idx >= context_start and offset[idx][1] >= end_char:
                      idx -= 1
                  end_positions.append(idx + 1)
      
          inputs["start_positions"] = start_positions
          inputs["end_positions"] = end_positions
          return inputs
      
      train_dataset = raw_datasets["train"].map(
          preprocess_training_examples,
          batched=True,
          remove_columns=raw_datasets["train"].column_names,
      )
      len(raw_datasets["train"]), len(train_dataset)
      
      def preprocess_validation_examples(examples):
          questions = [q.strip() for q in examples["question"]]
          inputs = tokenizer(
              questions,
              examples["context"],
              max_length=max_length,
              truncation="only_second",
              stride=stride,
              return_overflowing_tokens=True,
              return_offsets_mapping=True,
              padding="max_length",
          )
      
          sample_map = inputs.pop("overflow_to_sample_mapping")
          example_ids = []
      
          for i in range(len(inputs["input_ids"])):
              sample_idx = sample_map[i]
              example_ids.append(examples["id"][sample_idx])
      
              sequence_ids = inputs.sequence_ids(i)
              offset = inputs["offset_mapping"][i]
              inputs["offset_mapping"][i] = [
                  o if sequence_ids[k] == 1 else None for k, o in enumerate(offset)
              ]
      
          inputs["example_id"] = example_ids
          return inputs
      
      validation_dataset = raw_datasets["validation"].map(
          preprocess_validation_examples,
          batched=True,
          remove_columns=raw_datasets["validation"].column_names,
      )
      len(raw_datasets["validation"]), len(validation_dataset)
      
      
      metric = load_metric("squad")
      
      n_best = 20
      max_answer_length = 30
      
      def compute_metrics(start_logits, end_logits, features, examples):
          example_to_features = collections.defaultdict(list)
          for idx, feature in enumerate(features):
              example_to_features[feature["example_id"]].append(idx)
      
          predicted_answers = []
          for example in tqdm(examples):
              example_id = example["id"]
              context = example["context"]
              answers = []
      
              # Loop through all features associated with that example
              for feature_index in example_to_features[example_id]:
                  start_logit = start_logits[feature_index]
                  end_logit = end_logits[feature_index]
                  offsets = features[feature_index]["offset_mapping"]
      
                  start_indexes = np.argsort(start_logit)[-1 : -n_best - 1 : -1].tolist()
                  end_indexes = np.argsort(end_logit)[-1 : -n_best - 1 : -1].tolist()
                  for start_index in start_indexes:
                      for end_index in end_indexes:
                          # Skip answers that are not fully in the context
                          if offsets[start_index] is None or offsets[end_index] is None:
                              continue
                          # Skip answers with a length that is either < 0 or > max_answer_length
                          if (
                              end_index < start_index
                              or end_index - start_index + 1 > max_answer_length
                          ):
                              continue
      
                          answer = {
                              "text": context[offsets[start_index][0] : offsets[end_index][1]],
                              "logit_score": start_logit[start_index] + end_logit[end_index],
                          }
                          answers.append(answer)
      
              # Select the answer with the best score
              if len(answers) > 0:
                  best_answer = max(answers, key=lambda x: x["logit_score"])
                  predicted_answers.append(
                      {"id": example_id, "prediction_text": best_answer["text"]}
                  )
              else:
                  predicted_answers.append({"id": example_id, "prediction_text": ""})
      
          theoretical_answers = [{"id": ex["id"], "answers": ex["answers"]} for ex in examples]
          return metric.compute(predictions=predicted_answers, references=theoretical_answers)
      
      # model = AutoModelForQuestionAnswering.from_pretrained(model_checkpoint)
      model = BertForQuestionAnswering.from_pretrained(model_checkpoint)
      
      args = TrainingArguments(
          "alephbert-finetuned-squad",
          evaluation_strategy="no",
          save_strategy="epoch",
          learning_rate=2e-5,
          num_train_epochs=3,
          weight_decay=0.01,
          fp16=False,
          push_to_hub=False, #TODO enable it if we eant push to hub
      ) 
      
      trainer = Trainer(
          model=model,
          args=args,
          train_dataset=train_dataset,
          eval_dataset=validation_dataset,
          tokenizer=tokenizer,
      )
      trainer.train() #TODO enable it if we want to train
      
      predictions, _ = trainer.predict(validation_dataset)
      start_logits, end_logits = predictions
      compute_metrics(start_logits, end_logits, validation_dataset, raw_datasets["validation"])
      
      # Save the model
      output_dir = "aleph_bert-finetuned-squad"
      trainer.save_model(output_dir)
      
      
      # Replace this with your own checkpoint
      #model_checkpoint = "huggingface-course/bert-finetuned-squad"
      model_checkpoint=output_dir
      question_answerer = pipeline("question-answering", model=model_checkpoint)
      
      context = """
      🤗 Transformers is backed by the three most popular deep learning libraries — Jax, PyTorch and TensorFlow — with a seamless integration
      between them. It's straightforward to train your models with one before loading them for inference with the other.
      """
      question = "Which deep learning libraries back 🤗 Transformers?"
      question_answerer(question=question, context=context)
      
 
2. The problem arises on trainer.train() 
3. If i change the model back to Bert the code runs well.
4. I dont know what is the problem

Thanks

## Expected behavior
from:  torch.embedding(weight, input, padding_idx, scale_grad_by_freq, sparse)
IndexError: index out of range in self


        
        --> 211 trainer.train() #TODO enable it if we want to train
            212 
            213 predictions, _ = trainer.predict(validation_dataset)
        
        11 frames
        [/usr/local/lib/python3.7/dist-packages/torch/nn/functional.py](https://localhost:8080/#) in embedding(input, weight, padding_idx, max_norm, norm_type, scale_grad_by_freq, sparse)
           2042         # remove once script supports set_grad_enabled
           2043         _no_grad_embedding_renorm_(weight, input, max_norm, norm_type)
        -> 2044     return torch.embedding(weight, input, padding_idx, scale_grad_by_freq, sparse)
           2045 
           2046 
        
        IndexError: index out of range in self
        


[Question_answering_(PyTorch).zip](https://github.com/huggingface/transformers/files/8142807/Question_answering_.PyTorch.zip)


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