[Model] Siglip2 Model Support (#27566)

Signed-off-by: piood <2477084691@qq.com>

vllm/transformers_utils/config.py

@@ -26,7 +26,10 @@ from huggingface_hub.utils import (
 )
 from transformers import GenerationConfig, PretrainedConfig
 from transformers.models.auto.image_processing_auto import get_image_processor_config
-from transformers.models.auto.modeling_auto import MODEL_FOR_CAUSAL_LM_MAPPING_NAMES
+from transformers.models.auto.modeling_auto import (
+    MODEL_FOR_CAUSAL_LM_MAPPING_NAMES,
+    MODEL_MAPPING_NAMES,
+)
 from transformers.models.auto.tokenization_auto import get_tokenizer_config
 from transformers.utils import CONFIG_NAME as HF_CONFIG_NAME
 
@@ -616,6 +619,13 @@ def get_config(
         model_type = MODEL_FOR_CAUSAL_LM_MAPPING_NAMES[config.model_type]
         config.update({"architectures": [model_type]})
 
+    # Architecture mapping for models without explicit architectures field
+    if not config.architectures:
+        if config.model_type not in MODEL_MAPPING_NAMES:
+            raise ValueError(f"Cannot find architecture name for {config.model_type}")
+        model_type = MODEL_MAPPING_NAMES[config.model_type]
+        config.update({"architectures": [model_type]})
+
     # ModelOpt 0.31.0 and after saves the quantization config in the model
     # config file.
     quantization_config = config_dict.get("quantization_config", None)