[Frontend] Perform offline path replacement to `tokenizer` (#29706)

Signed-off-by: Tsukasa OI <floss_llm@irq.a4lg.com>

tests/entrypoints/offline_mode/test_offline_mode.py

@@ -23,6 +23,16 @@ MODEL_CONFIGS = [
         "max_num_seqs": 64,
         "tensor_parallel_size": 1,
     },
+    {
+        "model": "Qwen/Qwen3-0.6B",
+        "enforce_eager": True,
+        "gpu_memory_utilization": 0.50,
+        "max_model_len": 64,
+        "max_num_batched_tokens": 64,
+        "max_num_seqs": 64,
+        "tensor_parallel_size": 1,
+        "tokenizer": "Qwen/Qwen3-4B",
+    },
     {
         "model": "mistralai/Mistral-7B-Instruct-v0.1",
         "enforce_eager": True,

vllm/engine/arg_utils.py

@@ -581,15 +581,26 @@ class EngineArgs:
         from vllm.plugins import load_general_plugins
 
         load_general_plugins()
-        # when use hf offline,replace model id to local model path
+        # when use hf offline,replace model and tokenizer id to local model path
         if huggingface_hub.constants.HF_HUB_OFFLINE:
             model_id = self.model
             self.model = get_model_path(self.model, self.revision)
-            logger.info(
-                "HF_HUB_OFFLINE is True, replace model_id [%s] to model_path [%s]",
-                model_id,
-                self.model,
-            )
+            if model_id is not self.model:
+                logger.info(
+                    "HF_HUB_OFFLINE is True, replace model_id [%s] to model_path [%s]",
+                    model_id,
+                    self.model,
+                )
+            if self.tokenizer is not None:
+                tokenizer_id = self.tokenizer
+                self.tokenizer = get_model_path(self.tokenizer, self.tokenizer_revision)
+                if tokenizer_id is not self.tokenizer:
+                    logger.info(
+                        "HF_HUB_OFFLINE is True, replace tokenizer_id [%s] "
+                        "to tokenizer_path [%s]",
+                        tokenizer_id,
+                        self.tokenizer,
+                    )
 
     @staticmethod
     def add_cli_args(parser: FlexibleArgumentParser) -> FlexibleArgumentParser: