Design of network topology
Determine:
Number of input nodes
Too few nodes => misclassification
Too many nodes=> overfitting
Problems with dollar sign:
https://stackoverflow.com/questions/42560090/what-is-the-meaning-of-the-dollar-sign-in-r-function
Problem with tilde sign:
https://stackoverflow.com/questions/14976331/use-of-tilde-in-r-programming-language?noredirect=1&lq=1
