message: Fix pip installation in speech training script
diff: "colab": {}
  },
  "source": [
  - "# Replace Colab's default TensorFlow install with a more recent\n",
  + "# Replace Colab's default TensorFlow install with an older\n",
  "# build that contains the operations that are needed for training\n",
  "!pip uninstall -y tensorflow tensorflow_estimator tensorboard\n",
  - "!pip install -q tf-estimator-nightly==1.14.0.dev2019072901 tf-nightly-gpu==1.15.0.dev20190729"
  + "!pip install -q tensorflow==1.15"
  ],
  "execution_count": 0,
  "outputs": []
  },
  "source": [
  "# Clone the repository from GitHub\n",
  - "!git clone -q https://github.com/tensorflow/tensorflow\n",
  - "# Check out a commit that has been tested to work\n",
  - "# with the build of TensorFlow we're using\n",
  - "!git -c advice.detachedHead=false -C tensorflow checkout 17ce384df70"
  + "!git clone -q https://github.com/tensorflow/tensorflow\n"
  ],
  "execution_count": 0,
  "outputs": []
  "--wanted_words=${WANTED_WORDS} --silence_percentage=25 --unknown_percentage=25 \\\n",
  "--quantize=1 --verbosity=WARN --how_many_training_steps=${TRAINING_STEPS} \\\n",
  "--learning_rate=${LEARNING_RATE} --summaries_dir=/content/retrain_logs \\\n",
  - "--data_dir=/content/speech_dataset --train_dir=/content/speech_commands_train \\\n"
  + "--data_dir=/content/speech_dataset --train_dir=/content/speech_commands_train\n"
  ],
  "execution_count": 0,
  "outputs": []
  