Update app.py

app.py

@@ -5,6 +5,8 @@ from langchain.llms import CTransformers
 from transformers import AutoModelForCausalLM, AutoTokenizer
 from transformers import pipeline
 from langchain.llms.huggingface_pipeline import HuggingFacePipeline
+from sentence_transformers import SentenceTransformer
+
 
 load_dotenv()