Fix Mistral yarn warning in Transformers v5 (#37292)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
Co-authored-by: Julien Denize <40604584+juliendenize@users.noreply.github.com>

vllm/transformers_utils/configs/mistral.py

@@ -2,7 +2,9 @@
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 from typing import Any
 
+from packaging.version import Version
 from transformers import PretrainedConfig, WhisperConfig
+from transformers import __version__ as TRANSFORMERS_VERSION
 
 from vllm.logger import init_logger
 
@@ -134,6 +136,10 @@ def _remap_mistral_yarn_args(config: dict) -> dict:
             # Cast to remove Transformers > v5 type warnings
             config["rope_parameters"][new_name] = cast(yarn_config.pop(old_name))
 
+    # Ignore apply_yarn_scaling in Transformers > v5 RoPE validation to remove warnings
+    if Version(TRANSFORMERS_VERSION) >= Version("5.3.0.dev0"):
+        config["ignore_keys_at_rope_validation"] = {"apply_yarn_scaling"}
+
     assert len(yarn_config) == 0, f"Unparsed yarn config: {yarn_config}"
 
     return config