Update requirements.txt

requirements.txt

@@ -1,4 +1,8 @@
-shiny==0.7.0
-shinyswatch==0.4.2
-seaborn==0.12.2
-matplotlib==3.7.1
+sentence-transformers
+langchain 
+PyPDF2 
+openai 
+chroma 
+faiss-cpu 
+transformer-embeddings
+-U langchain-community