Update app.py

app.py

@@ -536,6 +536,8 @@ from hazm import word_tokenize, sent_tokenize
 from sklearn.feature_extraction.text import TfidfVectorizer
 from sklearn.cluster import KMeans
 from sklearn.metrics.pairwise import cosine_similarity
+from concurrent.futures import ThreadPoolExecutor
+
 
 # تابع خلاصه‌سازی متن با استفاده از KMeans
 def summarize_text_with_kmeans(text, num_sentences=3):