[Bugfix] Fix load config when using bools (#9533)

vllm/engine/arg_utils.py

@@ -19,7 +19,7 @@ from vllm.model_executor.layers.quantization import QUANTIZATION_METHODS
 from vllm.transformers_utils.config import (
     maybe_register_config_serialize_by_value)
 from vllm.transformers_utils.utils import check_gguf_file
-from vllm.utils import FlexibleArgumentParser
+from vllm.utils import FlexibleArgumentParser, StoreBoolean
 
 if TYPE_CHECKING:
     from vllm.transformers_utils.tokenizer_group import BaseTokenizerGroup
@@ -1144,18 +1144,6 @@ class AsyncEngineArgs(EngineArgs):
         return parser
 
 
-class StoreBoolean(argparse.Action):
-
-    def __call__(self, parser, namespace, values, option_string=None):
-        if values.lower() == "true":
-            setattr(namespace, self.dest, True)
-        elif values.lower() == "false":
-            setattr(namespace, self.dest, False)
-        else:
-            raise ValueError(f"Invalid boolean value: {values}. "
-                             "Expected 'true' or 'false'.")
-
-
 # These functions are used by sphinx to build the documentation
 def _engine_args_parser():
     return EngineArgs.add_cli_args(FlexibleArgumentParser())