Update app.py

app.py

@@ -15,6 +15,8 @@ import re
 import torch
 from transformers import BertTokenizer, BertModel, BertForMaskedLM
 from wordfreq import zipf_frequency
+from keras.preprocessing.sequence import pad_sequences
+from tensorflow.keras.utils import to_categorical
 
 bert_model = 'bert-large-uncased'
 tokenizer = BertTokenizer.from_pretrained(bert_model)