Update app.py

app.py

@@ -9,7 +9,7 @@ from copy import deepcopy
 from typing import List
 import os
 from langchain import HuggingFaceHub, PromptTemplate, LLMChain
-from langchain.document_loaders import UnstructuredPDFLoader
+from langchain_community.document_loaders import UnstructuredPDFLoader
 from nltk.corpus import stopwords
 from nltk.tokenize import word_tokenize
 from nltk import FreqDist