[Feature] fit_transform ParameterLearning

[AlessandroBregoli]

Description

Add the method fit_transform to ParameterLearning. This method learn the parameter of a given node and update the network accordingly.

Acceptance Criteria

• Add the method fit_transform

Checklist

• fn fit_transform<T: process::NetworkProcess>( &self, net: &mut T, dataset: &tools::Dataset, node: usize)

(Optional) Extra info

It could be usefull to add a method for substituting parameters inside a NetworkProcess

An alternative version of fit_transorm can be:

fn fit_transform<T: process::NetworkProcess>( &self, net: T, dataset: &tools::Dataset, node: usize) -> T