Keras

Keras is a deep learning framework that is probably the most different from every other framework described previously. Most of the described frameworks are low-level modules that directly interact with GPU using CUDA.

Keras, on the other hand, could be understood as a meta-framework that interacts with other frameworks such as Theano or TensorFlow to handle its GPU interactions or other system-level access management. As such, it is highly flexible and very user-friendly, allowing developers to choose from a variety of underlying model implementations. Keras community support is also gaining good momentum and, as of September 2017, TensorFlow team plans to integrate Keras as a subset of the TensorFlow project.