removed unnecessary imports

app.py

@@ -5,11 +5,9 @@ import faiss
 import PyPDF2
 import os
 
-from transformers import BertTokenizer, BertModel
 from transformers import DPRContextEncoder, DPRContextEncoderTokenizer, DPRQuestionEncoder, DPRQuestionEncoderTokenizer, BartForQuestionAnswering
 from transformers import BartForConditionalGeneration, BartTokenizer, AutoTokenizer
 
-from langchain.embeddings import HuggingFaceEmbeddings
 from langchain import text_splitter
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.document_loaders import PyPDFLoader