Update app.py

app.py

@@ -4,6 +4,7 @@ import torch
 from transformers import PegasusTokenizer, PegasusForConditionalGeneration
 import tensorflow as tf
 from tensorflow.python.lib.io import file_io
+from nltk.tokenize import sent_tokenize
 
 
 import io
@@ -151,7 +152,7 @@ def pegasus(text):
         tokenized_sentences = []
         sentences = []
         length = 0
-        for sentence in tokenized_sentences(file):
+        for sentence in sent_tokenize(file):
             length += len(sentence)
             # 512 is the maximum input length for the Pegasus model
             if length < 512: