It's possible to create neural networks from raw code. But there are many code libraries you can use to speed up the process. These libraries include Microsoft CNTK, Google TensorFlow, Theano, PyTorch ...

TensorFlow* is a leading deep learning and machine learning framework, and as of May 2017, it now integrates optimizations for Intel® Xeon® processors and Intel® Xeon Phi™ processors. This is the ...