polish(pu): change default model from gpt to kimi

rag_demo.py

@@ -74,7 +74,7 @@ def get_retriever(vectorstore, k=4):
     return vectorstore.as_retriever(search_kwargs={'k': k})
 
 
-def setup_rag_chain(model_name="gpt-4", temperature=0):
+def setup_rag_chain(model_name="kimi", temperature=0):
     """设置检索增强生成流程"""
     if model_name.startswith("gpt"):
         # 如果是以gpt开头的模型,使用原来的逻辑
@@ -101,7 +101,7 @@ def setup_rag_chain(model_name="gpt-4", temperature=0):
 
 
 # 执行查询并打印结果
-def execute_query(retriever, rag_chain, query, model_name="gpt-4", temperature=0):
+def execute_query(retriever, rag_chain, query, model_name="kimi", temperature=0):
     """
     执行查询并返回结果及检索到的文档块
 
@@ -145,7 +145,7 @@ def execute_query(retriever, rag_chain, query, model_name="gpt-4", temperature=0
     return retrieved_documents, response_text
 
 
-def execute_query_no_rag(model_name="gpt-4", temperature=0, query=""):
+def execute_query_no_rag(model_name="kimi", temperature=0, query=""):
     """执行无 RAG 链的查询"""
     if model_name.startswith("gpt"):
         # 如果是以gpt开头的模型,使用原来的逻辑