Update app.py

app.py

@@ -8,7 +8,10 @@ import random
 import urllib.parse
 import spacy
 import nltk
-from nltk.tokenize import word_tokenize
+from nltk.tokenize import word_tokenize, sent_tokenize
+from sklearn.feature_extraction.text import TfidfVectorizer
+from sklearn.metrics.pairwise import cosine_similarity
+import numpy as np
 from nltk.tokenize import sent_tokenize
 from typing import List, Dict
 from tempfile import NamedTemporaryFile