#2837 Use cache folder for lockfile
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The CI fail about the meteor metric is unrelated to this PR 
2021-10-05T13:35:42Z
https://github.com/huggingface/datasets/pull/2887#issuecomment-934422016
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2021-10-05T13:35:42Z
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Fixes #2837 

Use a cache folder directory to store the FileLock.

The issue was that the lock file was in a readonly folder.
