[Model] Add support for Gemma 3 (#14660)

Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
Signed-off-by: Roger Wang <ywang@roblox.com>
Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>
Co-authored-by: Roger Wang <ywang@roblox.com>
Co-authored-by: DarkLight1337 <tlleungac@connect.ust.hk>

examples/offline_inference/vision_language_multi_image.py

@@ -80,6 +80,42 @@ def load_deepseek_vl2(question: str, image_urls: list[str]):
     )
 
 
+def load_gemma3(question, image_urls: list[str]) -> ModelRequestData:
+    model_name = "google/gemma-3-4b-it"
+
+    llm = LLM(model=model_name,
+              max_model_len=8192,
+              max_num_seqs=2,
+              limit_mm_per_prompt={"image": len(image_urls)})
+
+    placeholders = [{"type": "image", "image": url} for url in image_urls]
+    messages = [{
+        "role":
+        "user",
+        "content": [
+            *placeholders,
+            {
+                "type": "text",
+                "text": question
+            },
+        ],
+    }]
+
+    processor = AutoProcessor.from_pretrained(model_name)
+
+    prompt = processor.apply_chat_template(messages,
+                                           tokenize=False,
+                                           add_generation_prompt=True)
+
+    return ModelRequestData(
+        llm=llm,
+        prompt=prompt,
+        stop_token_ids=None,
+        image_data=[fetch_image(url) for url in image_urls],
+        chat_template=None,
+    )
+
+
 def load_h2ovl(question: str, image_urls: list[str]) -> ModelRequestData:
     model_name = "h2oai/h2ovl-mississippi-800m"
 
@@ -496,6 +532,7 @@ def load_qwen2_5_vl(question, image_urls: list[str]) -> ModelRequestData:
 model_example_map = {
     "aria": load_aria,
     "deepseek_vl_v2": load_deepseek_vl2,
+    "gemma3": load_gemma3,
     "h2ovl_chat": load_h2ovl,
     "idefics3": load_idefics3,
     "internvl_chat": load_internvl,