Fixed RAG script which was failing on dummy example
# What does this PR do?
Fixed RAG script which was failing on test_epoch_end in dummy example
The dummy example fails when test_epoch_end is called. The prefix="test" should be dynamic in the log metrics too.
Also, test_finetune.sh was failing when test file was not present.

@shamanez would be ideal to review.

Let me know if more information is needed.
_The documentation is not available anymore as the PR was closed or merged._<|||||>Hi there. This is an unmaintained research project, so we normally don't accept PRs on it. You can try pinging the original authors and see if they accept your suggestion :-)<|||||>@sgugger  looks all good to me.<|||||>Thanks for having a look @shamanez and thanks for your contribution @kaustubhdhole !