Update app.py

app.py

@@ -4,6 +4,10 @@ from huggingface_hub import InferenceClient
 import langchain
 from langchain import HuggingFaceHub
 from langchain.cache import InMemoryCache
+from langchain.document_loaders import PyPDFLoader, OnlinePDFLoader, Docx2txtLoader, UnstructuredWordDocumentLoader, UnstructuredPowerPointLoader
+from langchain.text_splitter import CharacterTextSplitter
+from langchain.vectorstores import Chroma
+from langchain.chains import RetrievalQA
 import gradio as gr
 
 HUGGINGFACEHUB_API_TOKEN = os.environ["HUGGINGFACEHUB_API_TOKEN"]