fix nltk bug

app.py

@@ -1,3 +1,14 @@
+import nltk
+import ssl
+
+try:
+    _create_unverified_https_context = ssl._create_unverified_context
+except AttributeError:
+    pass
+else:
+    ssl._create_default_https_context = _create_unverified_https_context
+nltk.download("cmudict")
+
 import gradio as gr
 import numpy as np
 import torch