Update app.py

app.py

@@ -143,7 +143,7 @@ def generate_and_plot(file, query):
 import os
 import gradio as gr
 from langchain.chat_models import ChatOpenAI
-from langchain.document_loaders import PyPDFLoader
+from langchain_community.document_loaders import PyPDFLoader
 from langchain.text_splitter import CharacterTextSplitter
 # from langchain.embeddings.openai import OpenAIEmbeddings
 # from langchain.vectorstores import Chroma