Update app.py

app.py

@@ -3,6 +3,7 @@ from haystack.nodes import FARMReader, PreProcessor, PDFToTextConverter, TfidfRe
 from haystack.document_stores import InMemoryDocumentStore
 from haystack.pipelines import ExtractiveQAPipeline
 #from torch import 
+from sentence_transformers import CrossEncoder, SentenceTransformer
 
 document_store = InMemoryDocumentStore()
 model = "Saturdays/mdeberta-v3-base-squad2_refugees_dataset_finetuned"