[VLM] Florence-2 supports online serving (#16164)

Signed-off-by: Isotr0py <2037008807@qq.com>

examples/template_florence2.jinja

+{%- for message in messages -%}
+    {%- if message['role'] == 'user' -%}
+        {{- message['content'] -}}
+    {%- elif message['role'] == 'assistant' -%}
+        {{- message['content'] -}}
+    {%- endif -%}
+{%- endfor -%}

vllm/entrypoints/chat_utils.py

@@ -487,8 +487,8 @@ class BaseMultiModalItemTracker(ABC, Generic[_T]):
                 return "<|endoftext10|>"  # 200010 (see vocab.json in hf model)
             if model_type in ("minicpmo", "minicpmv"):
                 return "(<image>./</image>)"
-            if model_type in ("blip-2", "fuyu", "paligemma", "pixtral",
-                              "mistral3"):
+            if model_type in ("blip-2", "florence2", "fuyu", "paligemma",
+                              "pixtral", "mistral3"):
                 # These models do not use image tokens in the prompt
                 return None
             if model_type == "qwen":

vllm/model_executor/models/florence2.py

@@ -10,7 +10,7 @@ import torch
 import torch.nn as nn
 import torch.nn.functional as F
 from einops import rearrange
-from transformers import BatchFeature, PretrainedConfig
+from transformers import BartTokenizer, BatchFeature, PretrainedConfig
 
 from vllm.config import VllmConfig
 from vllm.model_executor.layers.logits_processor import LogitsProcessor
@@ -826,6 +826,18 @@ class Florence2MultiModalProcessor(
     ) -> Union[str, list[int]]:
         return [self.info.get_hf_config().eos_token_id]
 
+    def _apply_hf_processor_tokens_only(
+        self,
+        prompt_tokens: list[int],
+    ) -> list[int]:
+        hf_processor = self.info.get_hf_processor()
+        tokenizer: BartTokenizer = hf_processor.tokenizer
+        prompt_text = tokenizer.decode(prompt_tokens)
+        # convert task tokens to prompt
+        prompt_text = hf_processor._construct_prompts([prompt_text])[0]
+        prompt_tokens = tokenizer.encode(prompt_text, add_special_tokens=False)
+        return prompt_tokens
+
     def _call_hf_processor(
         self,
         prompt: str,