support chat model in huggingface (#2802)

### What problem does this PR solve?

#2794

### Type of change
- [x] New Feature (non-breaking change which adds functionality)

rag/llm/__init__.py

@@ -107,6 +107,7 @@ ChatModel = {
     "BaiduYiyan": BaiduYiyanChat,
     "Anthropic": AnthropicChat,
     "Google Cloud": GoogleChat,
+    "HuggingFace": HuggingFaceChat,
 }
 
 RerankModel = {

rag/llm/chat_model.py

@@ -104,7 +104,13 @@ class XinferenceChat(Base):
         if base_url.split("/")[-1] != "v1":
             base_url = os.path.join(base_url, "v1")
         super().__init__(key, model_name, base_url)
-
+class HuggingFaceChat(Base):
+    def __init__(self, key=None, model_name="", base_url=""):
+        if not base_url:
+            raise ValueError("Local llm url cannot be None")
+        if base_url.split("/")[-1] != "v1":
+            base_url = os.path.join(base_url, "v1")
+        super().__init__(key, model_name, base_url)
 
 class DeepSeekChat(Base):
     def __init__(self, key, model_name="deepseek-chat", base_url="https://api.deepseek.com/v1"):

web/src/pages/user-setting/setting-model/ollama-modal/index.tsx

@@ -54,7 +54,10 @@ const OllamaModal = ({
     llmFactoryToUrlMap[llmFactory as LlmFactory] ||
     'https://github.com/infiniflow/ragflow/blob/main/docs/guides/deploy_local_llm.mdx';
   const optionsMap = {
-    HuggingFace: [{ value: 'embedding', label: 'embedding' }],
+    HuggingFace: [
+      { value: 'embedding', label: 'embedding' },
+      { value: 'chat', label: 'chat' },
+    ],
     Xinference: [
       { value: 'chat', label: 'chat' },
       { value: 'embedding', label: 'embedding' },