diff --git a/11_training_deep_neural_networks.ipynb b/11_training_deep_neural_networks.ipynb
index eeb6abb77..be84f8b3f 100644
--- a/11_training_deep_neural_networks.ipynb
+++ b/11_training_deep_neural_networks.ipynb
@@ -3375,7 +3375,7 @@
     "    def on_batch_begin(self, batch, logs=None):\n",
     "        # 노트: 에포크마다 `batch` 매개변수가 재설정됩니다\n",
     "        lr = K.get_value(self.model.optimizer.lr)\n",
-    "        K.set_value(self.model.optimizer.lr, lr * 0.1**(1 / s))\n",
+    "        K.set_value(self.model.optimizer.lr, lr * 0.1**(1 / self.s))\n",
     "\n",
     "    def on_epoch_end(self, epoch, logs=None):\n",
     "        logs = logs or {}\n",
@@ -7291,7 +7291,7 @@
    "provenance": []
   },
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },