Internal Form of Equations
From Netica
Internal Form of Equations
Netica converts equations to an internal form for fast evaluation. Sometimes that means extra functions are invoked that weren't in the original equation; these functions always start with an underscore.
You may receive an error message that indicates there was a problem evaluating one of these functions. Generally that occurs because in your equation you supply values to a function that are out of its domain.
If you want to see what the internal representation of the equation in Netica looks like, you can generate a report by choosing Report → Horizontal Format from the menu and then Report → Equation.
Some example internal functions are:
_not _discretize _find0
_levels _select0 _Bernoulli