added Hybrid Search with BM25

app.py

@@ -420,11 +420,11 @@ class BSIChatbot:
         # )
 
         # Alles außer letzte Useranfrage, Normaler Query
-        query, context = self.retrieval(query, rerankingStep)
+        query, context = self.retrieval(query, rerankingStep, True)
         if stepBackPrompt == True:
             stepBackQuery = self.stepBackPrompt(query)
             print("DBG stepBackQuery:" + stepBackQuery)
-            stepBackQuery, stepBackContext = self.retrieval(stepBackQuery, rerankingStep)
+            stepBackQuery, stepBackContext = self.retrieval(stepBackQuery, rerankingStep, True)
             print("DBG stepBackContext:" + stepBackContext)
             sysPrompt = """
             You are an helpful Chatbot for the BSI IT-Grundschutz. Using the information contained in the context,