Add **kwargs to model base class constructors (#9252)

Updated constructors for base and derived classes in chat, embedding,
rerank, sequence2txt, and tts models to accept **kwargs. This change
improves extensibility and allows passing additional parameters without
breaking existing interfaces.

- [x] Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: IT: Sop.Son <sop.son@feavn.local>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

rag/llm/chat_model.py

@@ -1216,11 +1216,11 @@ class LmStudioChat(Base):
 class OpenAI_APIChat(Base):
     _FACTORY_NAME = ["VLLM", "OpenAI-API-Compatible"]
 
-    def __init__(self, key, model_name, base_url):
+    def __init__(self, key, model_name, base_url, **kwargs):
         if not base_url:
             raise ValueError("url cannot be None")
         model_name = model_name.split("___")[0]
-        super().__init__(key, model_name, base_url)
+        super().__init__(key, model_name, base_url, **kwargs)
 
 
 class PPIOChat(Base):

rag/llm/embedding_model.py

@@ -37,7 +37,12 @@ from rag.utils import num_tokens_from_string, truncate
 
 
 class Base(ABC):
-    def __init__(self, key, model_name):
+    def __init__(self, key, model_name, **kwargs):
+        """
+        Constructor for abstract base class.
+        Parameters are accepted for interface consistency but are not stored.
+        Subclasses should implement their own initialization as needed.
+        """
         pass
 
     def encode(self, texts: list):
@@ -864,7 +869,7 @@ class VoyageEmbed(Base):
 class HuggingFaceEmbed(Base):
     _FACTORY_NAME = "HuggingFace"
 
-    def __init__(self, key, model_name, base_url=None):
+    def __init__(self, key, model_name, base_url=None, **kwargs):
         if not model_name:
             raise ValueError("Model name cannot be None")
         self.key = key

rag/llm/rerank_model.py

@@ -33,7 +33,11 @@ from api.utils.log_utils import log_exception
 from rag.utils import num_tokens_from_string, truncate
 
 class Base(ABC):
-    def __init__(self, key, model_name):
+    def __init__(self, key, model_name, **kwargs):
+        """
+        Abstract base class constructor.
+        Parameters are not stored; initialization is left to subclasses.
+        """
         pass
 
     def similarity(self, query: str, texts: list):
@@ -315,7 +319,7 @@ class NvidiaRerank(Base):
 class LmStudioRerank(Base):
     _FACTORY_NAME = "LM-Studio"
 
-    def __init__(self, key, model_name, base_url):
+    def __init__(self, key, model_name, base_url, **kwargs):
         pass
 
     def similarity(self, query: str, texts: list):
@@ -396,7 +400,7 @@ class CoHereRerank(Base):
 class TogetherAIRerank(Base):
     _FACTORY_NAME = "TogetherAI"
 
-    def __init__(self, key, model_name, base_url):
+    def __init__(self, key, model_name, base_url, **kwargs):
         pass
 
     def similarity(self, query: str, texts: list):

rag/llm/sequence2txt_model.py

@@ -28,7 +28,11 @@ from rag.utils import num_tokens_from_string
 
 
 class Base(ABC):
-    def __init__(self, key, model_name):
+    def __init__(self, key, model_name, **kwargs):
+        """
+        Abstract base class constructor.
+        Parameters are not stored; initialization is left to subclasses.
+        """
         pass
 
     def transcription(self, audio, **kwargs):

rag/llm/tts_model.py

@@ -63,7 +63,11 @@ class ServeTTSRequest(BaseModel):
 
 
 class Base(ABC):
-    def __init__(self, key, model_name, base_url):
+    def __init__(self, key, model_name, base_url, **kwargs):
+        """
+        Abstract base class constructor.
+        Parameters are not stored; subclasses should handle their own initialization.
+        """
         pass
 
     def tts(self, audio):