grpc_server: fix tokenizer group usage

Author: dtrifiro

vllm/entrypoints/grpc/grpc_server.py

@@ -92,7 +92,6 @@ def __init__(self, engine: AsyncLLMEngine, args: argparse.Namespace):
         self.engine: AsyncLLMEngine = engine
 
         # These set in _post_init()
-        self.tokenizer_group: BaseTokenizerGroup = None
         self.tokenizer: Union[PreTrainedTokenizer,
                               PreTrainedTokenizerFast] = None
         self.config: ModelConfig = None
@@ -101,9 +100,13 @@ def __init__(self, engine: AsyncLLMEngine, args: argparse.Namespace):
         self.skip_special_tokens = not args.output_special_tokens
         self.default_include_stop_seqs = args.default_include_stop_seqs
 
+    @property
+    def tokenizer_group(self) -> BaseTokenizerGroup:
+        return self.engine.engine
+
+
     async def _post_init(self):
         self.config = await self.engine.get_model_config()
-        self.tokenizer_group = await self.engine.get_tokenizer_group()
         self.tokenizer = await self.engine.get_tokenizer()
 
         # Swap in the special TGIS stats logger