Update app.py

app.py

@@ -5,6 +5,8 @@ from langchain_community.document_loaders import PDFPlumberLoader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain_core.vectorstores import InMemoryVectorStore
 from langchain_core.prompts import ChatPromptTemplate
+from langchain.embeddings import OpenAIEmbeddings
+
 
 # Set up Hugging Face model and token
 model = "mistralai/Mixtral-8x7B-Instruct-v0.1"  # You can change to a model of your choice from Hugging Face
@@ -23,8 +25,11 @@ Answer:
 pdfs_directory = '../pdfs'
 os.makedirs(pdfs_directory, exist_ok=True)
 
+# Initialize the embedding model
+embedding = OpenAIEmbeddings()
+
 # Initialize the vector store for document indexing
-vector_store = InMemoryVectorStore()
+vector_store = InMemoryVectorStore(embedding=embedding)
 
 # Function to upload PDF file
 def upload_pdf(file):