scripts : improve get-wikitext-2.sh (#19952)
* scripts : improve get-wikitext-2.sh
Switch to sh, add curl fallback, and avoid redundant downloads
Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>
* fix indent
Signed-off-by: Adrien Gallouët <angt@huggingface.co>
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Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>
Signed-off-by: Adrien Gallouët <angt@huggingface.co>