Update app.py

app.py

@@ -21,6 +21,7 @@ from pinecone_text.sparse import BM25Encoder
 from langchain_huggingface import HuggingFaceEmbeddings
 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