

TITLE
Improve the `run_xlni` example to use the Datasets library

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The [`run_xlni`](https://github.com/huggingface/transformers/blob/master/examples/text-classification/run_xnli.py) example should be improved (following the model of [`run_glue`](https://github.com/huggingface/transformers/blob/master/examples/text-classification/run_glue.py)) to use the Datasets library to download and preprocess the datasets.

Ideally, copying the `run_glue` example and adapting the relevant parts should be the way to go.