Fix too many clause while searching. (#5119)

### What problem does this PR solve?

#5100

### Type of change

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

rag/nlp/synonym.py

@@ -66,7 +66,7 @@ class Dealer:
         except Exception as e:
             logging.error("Fail to load synonym!" + str(e))
 
-    def lookup(self, tk):
+    def lookup(self, tk, topn=8):
         if re.match(r"[a-z]+$", tk):
             res = list(set([re.sub("_", " ", syn.name().split(".")[0]) for syn in wordnet.synsets(tk)]) - set([tk]))
             return [t for t in res if t]
@@ -76,7 +76,7 @@ class Dealer:
         res = self.dictionary.get(re.sub(r"[ \t]+", " ", tk.lower()), [])
         if isinstance(res, str):
             res = [res]
-        return res
+        return res[:topn]
 
 
 if __name__ == '__main__':

rag/raptor.py

@@ -39,6 +39,7 @@ class RecursiveAbstractiveProcessing4TreeOrganizedRetrieval:
         if response:
             return response
         response = self._llm_model.chat(system, history, gen_conf)
+        response = re.sub(r"<think>.*</think>", "", response, flags=re.DOTALL)
         if response.find("**ERROR**") >= 0:
             raise Exception(response)
         set_llm_cache(self._llm_model.llm_name, system, response, history, gen_conf)