Add std:: before size_t
Add newral_network class
Implement Constractor of neural_network
Add data member of neural_network
Fix indent
Replace data member
Add member function
Add '_' to data member
Add to neural_network::learn()
Add data member
Fix constractor
Implement neural_network::learn()
Change main function
Implement neural_network::check()
Change main function
Implement neural_network::print_weight() for debug
Change int to double
Fix
Fix, because mistake the size of weight_
Add and implement neural_network::transfer()