第三步:为TF新手准备的其他方面内容
https://github.com/tflearn/tflearn/blob/master/examples/others/recommender_wide_and_deep.py
https://github.com/tflearn/tflearn/blob/master/examples/notebooks/spiral.ipynb
https://github.com/tflearn/tflearn/blob/master/examples/extending_tensorflow/layers.py
https://github.com/tflearn/tflearn/blob/master/examples/extending_tensorflow/layers.py
https://github.com/tflearn/tflearn/blob/master/examples/extending_tensorflow/builtin_ops.py
https://github.com/tflearn/tflearn/blob/master/examples/extending_tensorflow/summaries.py
https://github.com/tflearn/tflearn/blob/master/examples/extending_tensorflow/variables.py