Update app.py

app.py

@@ -1,12 +1,13 @@
 from langchain_community.document_loaders import PyPDFLoader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain_community.embeddings import SentenceTransformerEmbeddings
-from langchain.vectorstores import Chroma
+from langchain_community.vectorstores import Chroma
 from langchain_community.llms import LlamaCpp
 from langchain.chains import RetrievalQA
 from langchain.schema.runnable import RunnablePassthrough
 from langchain.schema.output_parser import StrOutputParser
 from langchain.prompts import ChatPromptTemplate
+from langchain_huggingface import HuggingFaceEmbeddings
 import gradio as gr
 import os