[Model][1/N] Automatic conversion of CrossEncoding model (#20012)

Signed-off-by: wang.yuqi <noooop@126.com>

vllm/config.py

@@ -569,6 +569,10 @@ class ModelConfig:
         else:
             self.truncation_side = "right"
 
+        model_info, arch = self.registry.inspect_model_cls(self.architectures)
+        self._model_info = model_info
+        self._architecture = arch
+
         self.pooler_config = self._init_pooler_config()
 
         self.dtype = _get_and_verify_dtype(
@@ -660,8 +664,18 @@ class ModelConfig:
 
     @property
     def architectures(self) -> list[str]:
+        # architectures in the model config.
         return getattr(self.hf_config, "architectures", [])
 
+    @property
+    def architecture(self) -> str:
+        # The architecture vllm actually used.
+        return self._architecture
+
+    @property
+    def model_info(self) -> dict[str, Any]:
+        return self._model_info
+
     def maybe_pull_model_tokenizer_for_s3(self, model: str,
                                           tokenizer: str) -> None:
         """Pull model/tokenizer from S3 to temporary directory when needed.
@@ -4450,6 +4464,9 @@ class VllmConfig:
     def __post_init__(self):
         """Verify configs are valid & consistent with each other.
         """
+
+        self.try_verify_and_update_config()
+
         if self.model_config is not None:
             self.model_config.verify_async_output_proc(self.parallel_config,
                                                        self.speculative_config,
@@ -4694,11 +4711,21 @@ class VllmConfig:
             batch_size_capture_list)
 
     def recalculate_max_model_len(self, max_model_len: int):
+        # Can only be called in try_verify_and_update_config
         model_config = self.model_config
         max_model_len = model_config.get_and_verify_max_len(max_model_len)
         self.model_config.max_model_len = max_model_len
         self.scheduler_config.max_model_len = max_model_len
-        self.compute_hash()
+
+    def try_verify_and_update_config(self):
+        architecture = getattr(self.model_config, "architecture", None)
+        if architecture is None:
+            return
+
+        from vllm.model_executor.models.config import MODELS_CONFIG_MAP
+        cls = MODELS_CONFIG_MAP.get(architecture, None)
+        if cls is not None:
+            cls.verify_and_update_config(self)
 
     def __str__(self):
         return (