Logging cleanup (#5973)

* Logging cleanup

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

unsloth/models/_utils.py

@@ -782,6 +782,22 @@ transformers_trainer_logger.addFilter(HideLoggingMessage("No label_names"))
 transformers_trainer_logger.addFilter(HideLoggingMessage("The tokenizer has new"))
 del transformers_trainer_logger
 
+# Strip the "[transformers] " prefix transformers>=5 adds; keep the messages.
+try:
+    try:
+        import transformers.utils.logging as _tf_log
+
+        _tf_log._configure_library_root_logger()
+    except Exception:
+        pass
+    _tf_root = logging.getLogger("transformers")
+    _tf_fmt = logging.Formatter("%(message)s")
+    for _h in list(_tf_root.handlers):
+        _h.setFormatter(_tf_fmt)
+    del _tf_root, _tf_fmt
+except Exception:
+    pass
+
 # Using the default loss: `ForCausalLMLoss`.
 try:
     from transformers.modeling_utils import logger as transformers_modeling_utils_logger