Update app.py

app.py

@@ -17,6 +17,7 @@ from langchain_community.retrievers import PineconeHybridSearchRetriever
 from langchain_groq import ChatGroq
 from langchain.retrievers import ContextualCompressionRetriever
 from langchain.retrievers.document_compressors import FlashrankRerank
+from langchain_community.chat_models import ChatPerplexity
 
 # Load environment variables
 load_dotenv(".env")
@@ -74,7 +75,8 @@ retriever = PineconeHybridSearchRetriever(
 )
 
 # Initialize LLM
-llm = ChatGroq(model="llama-3.1-70b-versatile", temperature=0, max_tokens=1024, max_retries=2)
+# llm = ChatGroq(model="llama-3.1-70b-versatile", temperature=0, max_tokens=1024, max_retries=2)
+llm = ChatPerplexity(temperature=0, pplx_api_key=GROQ_API_KEY, model="llama-3.1-sonar-large-128k-online", max_tokens=1024, max_retries=2)
 
 
 # Initialize Reranker