fix #4242

Former-commit-id: cf260e7af03f49aa5e3d6daf3b27738ff9b9bcb8

src/llamafactory/chat/vllm_engine.py

@@ -13,10 +13,11 @@ from .base_engine import BaseEngine, Response
 if is_vllm_available():
     from vllm import AsyncEngineArgs, AsyncLLMEngine, RequestOutput, SamplingParams
     from vllm.lora.request import LoRARequest
+
     try:
-        from vllm.multimodal import MultiModalData  # vllm==0.5.0
+        from vllm.multimodal import MultiModalData  # type: ignore (for vllm>=0.5.0)
     except ImportError:
-        from vllm.sequence import MultiModalData  # vllm<0.5.0
+        from vllm.sequence import MultiModalData  # for vllm<0.5.0
 
 
 if TYPE_CHECKING: