[NFC] polish applications/ColossalQA/colossalqa/chain/retrieval_qa/base.py code style (#5232)

applications/ColossalQA/colossalqa/chain/retrieval_qa/base.py

@@ -24,6 +24,7 @@ from langchain.pydantic_v1 import Field
 from langchain.schema import BaseRetriever, Document
 from langchain.schema.language_model import BaseLanguageModel
 
+
 class CustomBaseRetrievalQA(BaseRetrievalQA):
     """Base class for question-answering chains."""
 
@@ -98,7 +99,6 @@ class CustomBaseRetrievalQA(BaseRetrievalQA):
             for k, v in inputs.items()
             if k in ["stop", "temperature", "top_k", "top_p", "max_new_tokens", "doc_prefix"]
         }
-        answers = []
         if self.combine_documents_chain.memory is not None:
             buffered_history_backup, summarized_history_temp_backup = copy.deepcopy(
                 self.combine_documents_chain.memory.buffered_history
@@ -117,10 +117,10 @@ class CustomBaseRetrievalQA(BaseRetrievalQA):
             ) = copy.deepcopy(buffered_history_backup), copy.deepcopy(summarized_history_temp_backup)
 
         # if rejection_trigger_keywords is not given, return the response from LLM directly
-        rejection_trigger_keywrods = inputs.get('rejection_trigger_keywrods', [])
+        rejection_trigger_keywrods = inputs.get("rejection_trigger_keywrods", [])
         answer = answer if all([rej not in answer for rej in rejection_trigger_keywrods]) else None
-        if answer is None: 
-            answer = inputs.get('rejection_answer', "抱歉，根据提供的信息无法回答该问题。")
+        if answer is None:
+            answer = inputs.get("rejection_answer", "抱歉，根据提供的信息无法回答该问题。")
         if self.combine_documents_chain.memory is not None:
             self.combine_documents_chain.memory.save_context({"question": question}, {"output": answer})
 
@@ -161,10 +161,14 @@ class CustomBaseRetrievalQA(BaseRetrievalQA):
             input_documents=docs, question=question, callbacks=_run_manager.get_child(), **kwargs
         )
         # if rejection_trigger_keywords is not given, return the response from LLM directly
-        rejection_trigger_keywrods = inputs.get('rejection_trigger_keywrods', [])
-        answer = answer if all([rej not in answer for rej in rejection_trigger_keywrods]) or len(rejection_trigger_keywrods)==0 else None
+        rejection_trigger_keywrods = inputs.get("rejection_trigger_keywrods", [])
+        answer = (
+            answer
+            if all([rej not in answer for rej in rejection_trigger_keywrods]) or len(rejection_trigger_keywrods) == 0
+            else None
+        )
         if answer is None:
-            answer = inputs.get('rejection_answer', "抱歉，根据提供的信息无法回答该问题。")
+            answer = inputs.get("rejection_answer", "抱歉，根据提供的信息无法回答该问题。")
         self.combine_documents_chain.memory.save_context({"question": question}, {"output": answer})
 
         if self.return_source_documents: