[Misc] Update Mistral-3.1 example (vllm-project#16147)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>
Signed-off-by: Yang Wang <elainewy@meta.com>

Author: DarkLight1337

examples/offline_inference/mistral-small.py

@@ -13,9 +13,14 @@
 # - Server:
 #
 # ```bash
+# # Mistral format
 # vllm serve mistralai/Mistral-Small-3.1-24B-Instruct-2503 \
 #   --tokenizer-mode mistral --config-format mistral --load-format mistral \
 #   --limit-mm-per-prompt 'image=4' --max-model-len 16384
+#
+# # HF format
+# vllm serve mistralai/Mistral-Small-3.1-24B-Instruct-2503 \
+#   --limit-mm-per-prompt 'image=4' --max-model-len 16384
 # ```
 #
 # - Client:
@@ -44,19 +49,22 @@
 #     python demo.py simple
 #     python demo.py advanced
 
+# Lower max_model_len and/or max_num_seqs on low-VRAM GPUs.
+# These scripts have been tested on 2x L40 GPUs
+
 
 def run_simple_demo(args: argparse.Namespace):
     model_name = "mistralai/Mistral-Small-3.1-24B-Instruct-2503"
     sampling_params = SamplingParams(max_tokens=8192)
 
-    # Lower max_model_len and/or max_num_seqs on low-VRAM GPUs.
     llm = LLM(
         model=model_name,
-        tokenizer_mode="mistral",
-        config_format="mistral",
-        load_format="mistral",
+        tokenizer_mode="mistral" if args.format == "mistral" else "auto",
+        config_format="mistral" if args.format == "mistral" else "auto",
+        load_format="mistral" if args.format == "mistral" else "auto",
         max_model_len=4096,
         max_num_seqs=2,
+        tensor_parallel_size=2,
         disable_mm_preprocessor_cache=args.disable_mm_preprocessor_cache,
     )
 
@@ -88,17 +96,18 @@ def run_simple_demo(args: argparse.Namespace):
 
 def run_advanced_demo(args: argparse.Namespace):
     model_name = "mistralai/Mistral-Small-3.1-24B-Instruct-2503"
-    max_img_per_msg = 5
+    max_img_per_msg = 3
     max_tokens_per_img = 4096
 
     sampling_params = SamplingParams(max_tokens=8192, temperature=0.7)
     llm = LLM(
         model=model_name,
-        tokenizer_mode="mistral",
-        config_format="mistral",
-        load_format="mistral",
+        tokenizer_mode="mistral" if args.format == "mistral" else "auto",
+        config_format="mistral" if args.format == "mistral" else "auto",
+        load_format="mistral" if args.format == "mistral" else "auto",
         limit_mm_per_prompt={"image": max_img_per_msg},
         max_model_len=max_img_per_msg * max_tokens_per_img,
+        tensor_parallel_size=2,
         disable_mm_preprocessor_cache=args.disable_mm_preprocessor_cache,
     )
 
@@ -166,6 +175,11 @@ def main():
         help="Specify the demo mode: 'simple' or 'advanced'",
     )
 
+    parser.add_argument('--format',
+                        choices=["mistral", "hf"],
+                        default="mistral",
+                        help='Specify the format of the model to load.')
+
     parser.add_argument(
         '--disable-mm-preprocessor-cache',
         action='store_true',