feat: update model_specific_adjustment (#5344)

Co-authored-by: hebiao064 <hebiaobuaa@gmail.com>

python/sglang/srt/utils.py

@@ -569,7 +569,7 @@ def encode_video(video_path, frame_count_limit=None):
 
 
 def load_image(
-    image_file: Union[Image.Image, str, bytes]
+    image_file: Union[Image.Image, str, bytes],
 ) -> tuple[Image.Image, tuple[int, int]]:
     image = image_size = None
     if isinstance(image_file, Image.Image):
@@ -1905,3 +1905,28 @@ def get_local_ip_by_remote() -> str:
         return s.getsockname()[0]
     except Exception:
         raise ValueError(f"Can not get local ip")
+
+
+def is_page_size_one(server_args):
+    return server_args.page_size == 1
+
+
+def is_no_spec_infer_or_topk_one(server_args):
+    return server_args.speculative_eagle_topk is None or (
+        server_args.speculative_eagle_topk is not None
+        and server_args.speculative_eagle_topk == 1
+        and is_page_size_one(server_args)
+    )
+
+
+def is_fa3_default_architecture(hf_config):
+    architectures = getattr(hf_config, "architectures", None)
+    if not isinstance(architectures, list) or not architectures:
+        return False
+    default_archs = {
+        "Qwen2ForCausalLM",
+        "Llama4ForConditionalGeneration",
+        "LlamaForCausalLM",
+        "MistralForCausalLM",
+    }
+    return architectures[0] in default_archs