Update app.py

app.py

@@ -7,6 +7,8 @@ from transformers import pipeline
 from langchain.llms.huggingface_pipeline import HuggingFacePipeline
 from sentence_transformers import SentenceTransformer
 from sklearn.cluster import KMeans
+import nltk
+nltk.download('punkt')
 from nltk.tokenize import word_tokenize
 import numpy as np
 import scipy.spatial