Update app.py

app.py

@@ -6,6 +6,8 @@ from nltk import sent_tokenize
 from sklearn.feature_extraction.text import TfidfVectorizer
 from sklearn.cluster import KMeans
 import numpy as np
+import plotly.graph_objs as go
+
 
 # Download the punkt tokenizer
 nltk.download('punkt_tab')