Update vector_store_retriever.py

vector_store_retriever.py

@@ -10,6 +10,7 @@ from langchain.embeddings import HuggingFaceInstructEmbeddings
 from langchain.vectorstores import Chroma
 from transformers import AutoTokenizer
 from transformers import Tool
+from dotenv import load_dotenv
 
 load_dotenv()