title: Multi-news dataset loader attempts to strip wrong character from beginning of summaries
comments: Hi ! Thanks for reporting :)
  
  This dataset was simply converted from [tensorflow datasets](https://github.com/tensorflow/datasets/blob/master/tensorflow_datasets/summarization/multi_news.py)
  
  I think we can just remove the `.strip("- ")` and keep this character
body: ## Describe the bug
  
  The `multi_news.py` data loader has [a line which attempts to strip `"- "` from the beginning of summaries](https://github.com/huggingface/datasets/blob/aa743886221d76afb409d263e1b136e7a71fe2b4/datasets/multi_news/multi_news.py#L97). The actual character in the multi-news dataset, however, is `"– "`, which is different, e.g. `"– " != "- "`.
  
  I would have just opened a PR to fix the mistake, but I am wondering what the motivation for stripping this character is? AFAICT most approaches just leave it in, e.g. the current SOTA on this dataset, [PRIMERA](https://huggingface.co/allenai/PRIMERA-multinews) (you can see its in the generated summaries of the model in their [example notebook](https://github.com/allenai/PRIMER/blob/main/Evaluation_Example.ipynb)).
  
  ## Environment info
  <!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
  - `datasets` version: 2.2.0
  - Platform: Linux-5.4.188+-x86_64-with-Ubuntu-18.04-bionic
  - Python version: 3.7.13
  - PyArrow version: 6.0.1
  - Pandas version: 1.3.5
  