diff --git a/data/example_dataset/example_dataset.py b/data/example_dataset/example_dataset.py
index d7492b44..5d6cfa22 100644
--- a/data/example_dataset/example_dataset.py
+++ b/data/example_dataset/example_dataset.py
@@ -1,6 +1,6 @@
 import json
 import datasets
-from typing import Any, Dict, List
+from typing import Any, Dict, Generator, List, Tuple
 
 
 _DESCRIPTION = "An example of dataset."
@@ -40,7 +40,7 @@ class ExampleDataset(datasets.GeneratorBasedBuilder):
             )
         ]
 
-    def _generate_examples(self, filepath: str) -> Dict[int, Dict[str, Any]]:
+    def _generate_examples(self, filepath: str) -> Generator[Tuple[int, Dict[str, Any]], None, None]:
         example_dataset = json.load(open(filepath, "r", encoding="utf-8"))
         for key, example in enumerate(example_dataset):
             yield key, example
diff --git a/src/llmtuner/hparams/parser.py b/src/llmtuner/hparams/parser.py
index f275a1cb..74bcac2f 100644
--- a/src/llmtuner/hparams/parser.py
+++ b/src/llmtuner/hparams/parser.py
@@ -73,19 +73,6 @@ def _verify_model_args(model_args: "ModelArguments", finetuning_args: "Finetunin
         if model_args.adapter_name_or_path is not None and len(model_args.adapter_name_or_path) != 1:
             raise ValueError("Quantized model only accepts a single adapter. Merge them first.")
 
-    if model_args.infer_backend == "vllm":
-        if finetuning_args.stage != "sft":
-            raise ValueError("vLLM engine only supports auto-regressive models.")
-
-        if model_args.adapter_name_or_path is not None:
-            raise ValueError("vLLM engine does not support LoRA adapters. Merge them first.")
-
-        if model_args.quantization_bit is not None:
-            raise ValueError("vLLM engine does not support quantization.")
-
-        if model_args.rope_scaling is not None:
-            raise ValueError("vLLM engine does not support RoPE scaling.")
-
 
 def _parse_train_args(args: Optional[Dict[str, Any]] = None) -> _TRAIN_CLS:
     parser = HfArgumentParser(_TRAIN_ARGS)
@@ -154,6 +141,9 @@ def get_train_args(args: Optional[Dict[str, Any]] = None) -> _TRAIN_CLS:
         if training_args.fp16 or training_args.bf16:
             raise ValueError("Turn off mixed precision training when using `pure_bf16`.")
 
+    if model_args.infer_backend == "vllm":
+        raise ValueError("vLLM backend is only available for API, CLI and Web.")
+
     _verify_model_args(model_args, finetuning_args)
 
     if (
@@ -252,12 +242,27 @@ def get_infer_args(args: Optional[Dict[str, Any]] = None) -> _INFER_CLS:
     model_args, data_args, finetuning_args, generating_args = _parse_infer_args(args)
 
     _set_transformers_logging()
-    _verify_model_args(model_args, finetuning_args)
-    model_args.device_map = "auto"
 
     if data_args.template is None:
         raise ValueError("Please specify which `template` to use.")
 
+    if model_args.infer_backend == "vllm":
+        if finetuning_args.stage != "sft":
+            raise ValueError("vLLM engine only supports auto-regressive models.")
+
+        if model_args.adapter_name_or_path is not None:
+            raise ValueError("vLLM engine does not support LoRA adapters. Merge them first.")
+
+        if model_args.quantization_bit is not None:
+            raise ValueError("vLLM engine does not support quantization.")
+
+        if model_args.rope_scaling is not None:
+            raise ValueError("vLLM engine does not support RoPE scaling.")
+
+    _verify_model_args(model_args, finetuning_args)
+
+    model_args.device_map = "auto"
+
     return model_args, data_args, finetuning_args, generating_args
 
 
@@ -265,12 +270,17 @@ def get_eval_args(args: Optional[Dict[str, Any]] = None) -> _EVAL_CLS:
     model_args, data_args, eval_args, finetuning_args = _parse_eval_args(args)
 
     _set_transformers_logging()
-    _verify_model_args(model_args, finetuning_args)
-    model_args.device_map = "auto"
 
     if data_args.template is None:
         raise ValueError("Please specify which `template` to use.")
 
+    if model_args.infer_backend == "vllm":
+        raise ValueError("vLLM backend is only available for API, CLI and Web.")
+
+    _verify_model_args(model_args, finetuning_args)
+
+    model_args.device_map = "auto"
+
     transformers.set_seed(eval_args.seed)
 
     return model_args, data_args, eval_args, finetuning_args