[Feature] Support minicpmv v2.6 (#2785)

Co-authored-by: Chayenne <zhaochen20@outlook.com>
Co-authored-by: yizhang2077 <1109276519@qq.com>

python/sglang/lang/chat_template.py

@@ -88,7 +88,6 @@ register_chat_template(
     )
 )
 
-
 register_chat_template(
     ChatTemplate(
         name="claude",
@@ -101,7 +100,6 @@ register_chat_template(
     )
 )
 
-
 register_chat_template(
     ChatTemplate(
         name="chatml",
@@ -116,7 +114,6 @@ register_chat_template(
     )
 )
 
-
 register_chat_template(
     ChatTemplate(
         name="chatml-llava",
@@ -132,7 +129,6 @@ register_chat_template(
     )
 )
 
-
 # There is default system prompt for qwen
 # reference: https://modelscope.cn/models/qwen/Qwen2-72B-Instruct/file/view/master?fileName=tokenizer_config.json&status=1
 # The chat template is: "{% for message in messages %}{% if loop.first and messages[0]['role'] != 'system' %}{{ '<|im_start|>system\nYou are a helpful assistant.<|im_end|>\n' }}{% endif %}{{'<|im_start|>' + message['role'] + '\n' + message['content'] + '<|im_end|>' + '\n'}}{% endfor %}{% if add_generation_prompt %}{{ '<|im_start|>assistant\n' }}{% endif %}"
@@ -219,6 +215,21 @@ register_chat_template(
     )
 )
 
+# https://huggingface.co/openbmb/MiniCPM-V-2_6
+register_chat_template(
+    ChatTemplate(
+        name="minicpmv",
+        default_system_prompt=None,
+        role_prefix_and_suffix={
+            "system": ("", " "),
+            "user": ("user:", " "),
+            "assistant": ("assistant:", "</s>"),
+        },
+        stop_str=("<|im_end|>", "<|endoftext|>"),
+        image_token="(<image>./</image>)",
+    )
+)
+
 # The difference between "llama-3-instruct-llava" and "llama-3-instruct" is that llava uses a different image_token.
 register_chat_template(
     ChatTemplate(