updates per recrawl

app.py

@@ -7,7 +7,7 @@ import re
 from translate import Translator
 
 
-from llama_index.indices.managed.vectara import VectaraIndex
+from llama_index.indices.managed.vectara import VectaraIndex, VectaraQueryEngine
 from llama_index.core.agent import ReActAgent
 from llama_index.llms.openai import OpenAI
 from llama_index.core.tools import QueryEngineTool, ToolMetadata
@@ -28,9 +28,12 @@ def launch_bot():
         vectara = VectaraIndex(vectara_api_key=cfg.api_key, 
                                vectara_customer_id=cfg.customer_id, 
                                vectara_corpus_id=cfg.corpus_id)
+        vectara_retriever = vectara.as_retriever(n_sentences_before=5, n_sentences_after=10, 
+                                                 lambda_val=0.005, similarity_top_k=10)
         vectara_tool = QueryEngineTool(
-            query_engine = vectara.as_query_engine(summary_enabled=True, summary_num_results=5, summary_response_lang = languages[cfg.language],
-                                                   summary_prompt_name="vectara-summary-ext-24-05-large"),
+            query_engine = VectaraQueryEngine.from_args(retriever=vectara_retriever, summary_enabled=True, 
+                                                        summary_num_results=5, summary_response_lang = languages[cfg.language],
+                                                        summary_prompt_name="vectara-summary-ext-24-05-large"),
             metadata = ToolMetadata(name="Vectara", 
                                     description="Vectara Query Engine that is able to answer any questions about the Justice Harvard class."),
         )
@@ -40,7 +43,7 @@ def launch_bot():
             context = f'''
                 You are a teacher assistant at Justice Harvard course. You are helping a student with his questions.
                 The student is {cfg.student_age} years old, so make sure to adapt your response as appropriate to that age.
-                Phrase your answer to fit an {cfg.style} style.
+                You respond in the {cfg.style} style.
                 ''',
             verbose=True
         )