add support for deepseek (#668)

### What problem does this PR solve?

#666 

### Type of change

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

api/db/init_data.py

@@ -123,7 +123,12 @@ factory_infos = [{
     "name": "Youdao",
     "logo": "",
     "tags": "LLM,TEXT EMBEDDING,SPEECH2TEXT,MODERATION",
-        "status": "1",
+    "status": "1",
+},{
+    "name": "DeepSeek",
+    "logo": "",
+    "tags": "LLM",
+    "status": "1",
 },
     # {
     #     "name": "文心一言",
@@ -331,6 +336,21 @@ def init_llm_factory():
             "max_tokens": 512,
             "model_type": LLMType.EMBEDDING.value
         },
+        # ------------------------ DeepSeek -----------------------
+        {
+            "fid": factory_infos[8]["name"],
+            "llm_name": "deepseek-chat",
+            "tags": "LLM,CHAT,",
+            "max_tokens": 32768,
+            "model_type": LLMType.CHAT.value
+        },
+        {
+            "fid": factory_infos[8]["name"],
+            "llm_name": "deepseek-coder",
+            "tags": "LLM,CHAT,",
+            "max_tokens": 16385,
+            "model_type": LLMType.CHAT.value
+        },
     ]
     for info in factory_infos:
         try:

rag/llm/__init__.py

@@ -45,6 +45,7 @@ ChatModel = {
     "Tongyi-Qianwen": QWenChat,
     "Ollama": OllamaChat,
     "Xinference": XinferenceChat,
-    "Moonshot": MoonshotChat
+    "Moonshot": MoonshotChat,
+    "DeepSeek": DeepSeekChat
 }
 

rag/llm/chat_model.py

@@ -24,16 +24,7 @@ from rag.utils import num_tokens_from_string
 
 
 class Base(ABC):
-    def __init__(self, key, model_name):
-        pass
-
-    def chat(self, system, history, gen_conf):
-        raise NotImplementedError("Please implement encode method!")
-
-
-class GptTurbo(Base):
-    def __init__(self, key, model_name="gpt-3.5-turbo", base_url="https://api.openai.com/v1"):
-        if not base_url: base_url="https://api.openai.com/v1"
+    def __init__(self, key, model_name, base_url):
         self.client = OpenAI(api_key=key, base_url=base_url)
         self.model_name = model_name
 
@@ -54,28 +45,28 @@ class GptTurbo(Base):
             return "**ERROR**: " + str(e), 0
 
 
-class MoonshotChat(GptTurbo):
+class GptTurbo(Base):
+    def __init__(self, key, model_name="gpt-3.5-turbo", base_url="https://api.openai.com/v1"):
+        if not base_url: base_url="https://api.openai.com/v1"
+        super().__init__(key, model_name, base_url)
+
+
+class MoonshotChat(Base):
     def __init__(self, key, model_name="moonshot-v1-8k", base_url="https://api.moonshot.cn/v1"):
         if not base_url: base_url="https://api.moonshot.cn/v1"
-        self.client = OpenAI(
-            api_key=key, base_url=base_url)
-        self.model_name = model_name
+        super().__init__(key, model_name, base_url)
 
-    def chat(self, system, history, gen_conf):
-        if system:
-            history.insert(0, {"role": "system", "content": system})
-        try:
-            response = self.client.chat.completions.create(
-                model=self.model_name,
-                messages=history,
-                **gen_conf)
-            ans = response.choices[0].message.content.strip()
-            if response.choices[0].finish_reason == "length":
-                ans += "...\nFor the content length reason, it stopped, continue?" if is_english(
-                    [ans]) else "······\n由于长度的原因，回答被截断了，要继续吗？"
-            return ans, response.usage.total_tokens
-        except openai.APIError as e:
-            return "**ERROR**: " + str(e), 0
+
+class XinferenceChat(Base):
+    def __init__(self, key=None, model_name="", base_url=""):
+        key = "xxx"
+        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"):
+        if not base_url: base_url="https://api.deepseek.com/v1"
+        super().__init__(key, model_name, base_url)
 
 
 class QWenChat(Base):
@@ -157,25 +148,3 @@ class OllamaChat(Base):
         except Exception as e:
             return "**ERROR**: " + str(e), 0
 
-
-class XinferenceChat(Base):
-    def __init__(self, key=None, model_name="", base_url=""):
-        self.client = OpenAI(api_key="xxx", base_url=base_url)
-        self.model_name = model_name
-
-    def chat(self, system, history, gen_conf):
-        if system:
-            history.insert(0, {"role": "system", "content": system})
-        try:
-            response = self.client.chat.completions.create(
-                model=self.model_name,
-                messages=history,
-                **gen_conf)
-            ans = response.choices[0].message.content.strip()
-            if response.choices[0].finish_reason == "length":
-                ans += "...\nFor the content length reason, it stopped, continue?" if is_english(
-                    [ans]) else "······\n由于长度的原因，回答被截断了，要继续吗？"
-            return ans, response.usage.total_tokens
-        except openai.APIError as e:
-            return "**ERROR**: " + str(e), 0
-