run_summarization.py freezes 
Author: dorost1234
Pull request: no

## Environment info
<!-- You can run the command `transformers-cli env` and copy-and-paste its output below.
     Don't forget to fill out the missing fields in that output! -->

- `transformers` version: 4.10.2
- Platform: linux
- Python version: 3.8
- PyTorch version (GPU?): 1.7
- Tensorflow version (GPU?): - 
- Using GPU in script?: - 
- Using distributed or parallel set-up in script?: - 

### Who can help
<!-- Your issue will be replied to more quickly if you can figure out the right person to tag with @
 If you know how to use git blame, that is the easiest way, otherwise, here is a rough guide of **who to tag**.
 Please tag fewer than 3 people.

Models:

- albert, bert, xlm: @LysandreJik
- blenderbot, bart, marian, pegasus, encoderdecoder,  t5: @patrickvonplaten, @patil-suraj
- longformer, reformer, transfoxl, xlnet: @patrickvonplaten
- fsmt: @stas00
- funnel: @sgugger
- gpt2: @patrickvonplaten, @LysandreJik
- rag: @patrickvonplaten, @lhoestq
- tensorflow: @Rocketknight1

Library:

- benchmarks: @patrickvonplaten
- deepspeed: @stas00
- ray/raytune: @richardliaw, @amogkam
- text generation: @patrickvonplaten
- tokenizers: @LysandreJik
- trainer: @sgugger
- pipelines: @LysandreJik

Documentation: @sgugger

Model hub:

- for issues with a model report at https://discuss.huggingface.co/ and tag the model's creator.

HF projects:

- datasets: [different repo](https://github.com/huggingface/datasets)
- rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)

Examples:

- maintained examples (not research project or legacy): @sgugger, @patil-suraj
- research_projects/bert-loses-patience: @JetRunner
- research_projects/distillation: @VictorSanh

 -->
t5: @patrickvonplaten, @patil-suraj

## Information

I am running official run_summarization.py on A100, and this freezes for me after  this line 
```
09/16/2021 09:43:45 - INFO - datasets.utils.download_manager - Downloading took 0.0 min
09/16/2021 09:43:48 - INFO - datasets.utils.download_manager - Checksum Computation took 0.0 min
  0%|                                                                   | 0/5 [00:00<?, ?it/s]
```

## To reproduce
```
python run_seq2seq.py \
     --model_name_or_path t5-small \
     --do_train \
     --do_eval \
     --dataset_name cnn_dailymail \
     --dataset_config "3.0.0" \
     --source_prefix "summarize: " \
     --output_dir  temp/tst-summarization \
     --per_device_train_batch_size=4 \
     --per_device_eval_batch_size=4 \
    --overwrite_output_dir \
     --predict_with_generate
```
I have no idea why this is freezing and I am running the original codes no modifications. I appreciate your help a lot. thanks 

## Expected behavior
codes to be run 

Comments:
Not really sure about this. Looks like it's stuck at processing the dataset. Could you maybe see if you can just load the dataset? 

This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/master/CONTRIBUTING.md) are likely to be ignored.