TensorFlow is required for the "train new model" functionality.

To install TF:

sudo apt-get install libblas-dev liblapack-dev python-dev \ libatlas-base-dev gfortran python-setuptools

sudo ​pip2 install \ http://ci.tensorflow.org/view/Nightly/job/nightly-pi/lastSuccessfulBuild/artifact/output-artifacts/tensorflow-1.3.0-cp27-none-any.whl