@author: Xiang Ma
@date: 11/17/2019
@desp: This is used to record the study process
use polynomial(poly_reg.py) and neural network(nn_reg.py) to regress a log function.
The code is almost identical to the code of nn_reg.py, but when do predicting, using predict_classes() method instead.
This is used in multi classification, a little difference of binary classification. It uses one-hot encoding.