message: Removed version check for 1.9
diff: " \n",
  " # If you have a GPU, we recommend using CuDNNGRU(provides a 3x speedup than GRU)\n",
  " # the code automatically does that.\n",
  - " if tf.test.is_gpu_available() and '1.9' in tf.__version__:\n",
  + " if tf.test.is_gpu_available():\n",
  " self.gru = tf.keras.layers.CuDNNGRU(self.enc_units, \n",
  " return_sequences=True, \n",
  " return_state=True, \n",
  " \n",
  " # If you have a GPU, we recommend using CuDNNGRU(provides a 3x speedup than GRU)\n",
  " # the code automatically does that.\n",
  - " if tf.test.is_gpu_available() and '1.9' in tf.__version__:\n",
  + " if tf.test.is_gpu_available():\n",
  " self.gru = tf.keras.layers.CuDNNGRU(self.dec_units, \n",
  " return_sequences=True,\n",
  " return_state=True, \n",
  