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* do not use prefix="val" for test

The dummy example fails when test_epoch_end is called. The prefix="test" should be dynamic in the log metrics too.

* Create test.source

* Create test.target

* check

* update the RAG-end2end with new PL and RAY

* removed unwanted comments

* Black preview

* Fixup too!

* Fix check copies

* Use the same version as the CI

* Bump black

* Updates the default branch from master to main

* Links from `master` to `main`

* Typo

* Update examples/flax/README.md
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* [research_projects] deal with security alerts

* add a note of the original PL ver and warning

* Replace legacy torch.Tensor constructor with torch.{tensor, empty}

* Remove torch.Tensor in examples

* initial

* code quality test

* code quality

* added test functions in test_modeling_rag.py and test_retrieval_rag.py to test end2end retreiver

* minor change in test_modeling_rag

* fixed tests

* Update examples/research_projects/rag-end2end-retriever/README.md

typo corrected as suggested by lhoestq
Co-authored-by: Quentin Lhoest <42851186+lhoestq@users.noreply.github.com>

* Update examples/research_projects/rag-end2end-retriever/finetune_rag.py

type change suggested by lhoestq
Co-authored-by: Quentin Lhoest <42851186+lhoestq@users.noreply.github.com>

* Update src/transformers/models/rag/retrieval_rag.py

Adding this change as mentioned by lhoestq.
Co-authored-by: Quentin Lhoest <42851186+lhoestq@users.noreply.github.com>

* completed the minor changes suggested by the reviewers
Co-authored-by: Quentin Lhoest <42851186+lhoestq@users.noreply.github.com>