Update utils.py

utils.py

@@ -62,7 +62,10 @@ from tempfile import NamedTemporaryFile
 import nltk
 from nltk.corpus import stopwords
 from nltk.tokenize import word_tokenize
-from nltk.stem import WordNetLemmatizer
+from nltk.stem import WordNetLemmatizer, PorterStemmer
+from nltk.tokenize import RegexpTokenizer
+from transformers import BertModel, BertTokenizer
+from nltk.stem.snowball import SnowballStemmer
 
 from sklearn.feature_extraction.text import TfidfVectorizer
 from sklearn.metrics.pairwise import cosine_similarity