/**
* <summary> The operator method calls forward method which starts with having no feature in the model. In each iteration,
* it keeps adding the features that are not currently listed.</summary>
*
* <param name="current"> FeatureSubset that will be added to new ArrayList.</param>
* <param name="numberOfFeatures">Indicates the indices of indexList.</param>
* <returns>ArrayList of FeatureSubSets created from forward.</returns>
*/
protected override List <FeatureSubSet> Operator(FeatureSubSet current, int numberOfFeatures)
{
var result = new List <FeatureSubSet>();
Forward(result, current, numberOfFeatures);
return(result);
}
/**
* <summary> The backward method starts with all the features and removes the least significant feature at each iteration.</summary>
*
* <param name="currentSubSetList">List to add the FeatureSubsets.</param>
* <param name="current"> FeatureSubset that will be added to currentSubSetList</param>
*/
protected void Backward(List <FeatureSubSet> currentSubSetList, FeatureSubSet current)
{
for (var i = 0; i < current.Size(); i++)
{
var candidate = (FeatureSubSet)current.Clone();
candidate.Remove(i);
currentSubSetList.Add(candidate);
}
}
/**
* <summary> The forward method starts with having no feature in the model. In each iteration, it keeps adding the features that are not currently listed.</summary>
*
* <param name="currentSubSetList">List to add the FeatureSubsets.</param>
* <param name="current"> FeatureSubset that will be added to currentSubSetList.</param>
* <param name="numberOfFeatures"> The number of features to add the subset.</param>
*/
protected void Forward(List <FeatureSubSet> currentSubSetList, FeatureSubSet current, int numberOfFeatures)
{
for (var i = 0; i < numberOfFeatures; i++)
{
if (!current.Contains(i))
{
var candidate = (FeatureSubSet)current.Clone();
candidate.Add(i);
currentSubSetList.Add(candidate);
}
}
}
/**
* <summary> A constructor that sets the initial subset with given input.</summary>
*
* <param name="initialSubSet">{@link FeatureSubSet} input.</param>
*/
public SubSetSelection(FeatureSubSet initialSubSet)
{
this.initialSubSet = initialSubSet;
}
protected abstract List <FeatureSubSet> Operator(FeatureSubSet current, int numberOfFeatures);
