fixed rnn_cell import error

notebooks/3_NeuralNetworks/recurrent_network.ipynb

@@ -34,7 +34,7 @@
    ],
    "source": [
     "import tensorflow as tf\n",
-    "from tensorflow.models.rnn import rnn, rnn_cell\n",
+    "from tensorflow.python.ops import rnn, rnn_cell\n",
     "import numpy as np\n",
     "\n",
     "# Import MINST data\n",