Enforce string-formatting with f-strings (#10980)

* First third

* Styling and fix mistake

* Quality

* All the rest

* Treat %s and %d

* typo

* Missing )

* Apply suggestions from code review

Co-authored-by: Lysandre Debut <lysandre@huggingface.co>

Co-authored-by: Lysandre Debut <lysandre@huggingface.co>

tests/test_modeling_rag.py

@@ -74,7 +74,7 @@ def _assert_tensors_equal(a, b, atol=1e-12, prefix=""):
             return True
         raise
     except Exception:
-        msg = "{} != {}".format(a, b)
+        msg = f"{a} != {b}"
         if prefix:
             msg = prefix + ": " + msg
         raise AssertionError(msg)