Update app.py

app.py

@@ -3,12 +3,14 @@ from sentence_transformers import SentenceTransformer, util
 import PyPDF2
 import nltk
 from nltk.tokenize import sent_tokenize
-from pathlib import Path
+import os
 
-# Ensure NLTK resources are downloaded
-nltk_data_path = Path(nltk.data.find("tokenizers/punkt").path) if nltk.data.find("tokenizers/punkt") else None
-if not nltk_data_path:
-    nltk.download("punkt", quiet=True)
+# Ensure NLTK 'punkt' resource is available
+try:
+    nltk.data.find('tokenizers/punkt')
+except LookupError:
+    nltk.download('punkt', quiet=True, download_dir=os.path.expanduser('~/nltk_data'))
+    nltk.data.path.append(os.path.expanduser('~/nltk_data'))
 
 # Function to extract text from the uploaded PDF
 def extract_text_from_pdf(pdf_file):