新增openai的向量，重排模型

backend/app/settings.py

@@ -16,7 +16,6 @@ from modelProvide.customDashScope import CustomDashScope
 from util.register import *
 from llama_index.core.callbacks import CallbackManager
 
-
 ModelPlateCategory = '模型平台'
 
 def init_settings():
@@ -130,15 +129,19 @@ class OpenAIPlatform(ModelPlatform):
     
     def embedding(self):
         from llama_index.embeddings.openai import OpenAIEmbedding
-        dimensions = os.getenv("EMBEDDING_DIM")
-        config = {
-            "model": os.getenv("EMBEDDING_MODEL"),
-            "dimensions": int(dimensions) if dimensions is not None else None,
-        }
-        return OpenAIEmbedding(**config)
+        return OpenAIEmbedding(api_key=os.getenv('OPENAI_API_KEY'),
+                               api_base= os.getenv('EMBEDDING_BASE_URL'),
+                               model_name = os.getenv('EMBEDDING_MODEL'),
+                               dimensions= int(os.getenv("EMBEDDING_DIM")))
     
     def rerank(self):
-        pass  
+        from app.engine.rerank.siliconCloudRerank import SiliconCloudRerank
+        postprocess = [SiliconCloudRerank(top_n = int(os.getenv('RERANK_TOP_N',5)),
+                                          model = os.getenv('RERANK_MODEL'),
+                                          base_url = os.getenv('RERANK_BASE_URL'),
+                                          api_key = os.getenv('OPENAI_API_KEY')                                         
+                                        )]
+        return postprocess
 
 @register(ModelPlateCategory,'dashscope')   
 class DashscopePlatform(ModelPlatform):