Unregularized or Regularized version of cost function

[Nikronic]

In the ex3.pdf, instructor says we should write unregularized cost function in the file lrCostFunction but in this file,all comments are about regularized version of cost function. So we implement and compare our result to understand which is correct.
(regularized should be correct because of too many parameters - prevent overfitting)

[Nikronic]

Documentation in ex3.pdf separated vectorization and regularization
So we must regularization. we do it in single step not separate phase.