/// <inheritdoc/>
protected override void setMapping(FeatureInstance featureInstance, NodeMapping mapping)
{
var instanceNodeData = featureInstance.Origin.Words.Skip(Index).First();
var generalNodeData = IndexPrefix + Index;
mapping.SetMapping(instanceNodeData, generalNodeData);
}
private void indexPositions(FeatureInstance feature)
{
//set index of all indexed positions
foreach (var coveredPosition in feature.CoveredPositions)
{
_coveredPositions[coveredPosition] = true;
}
}
internal FeatureCover(FeatureInstance feature, ParsedUtterance utterance)
{
OriginalUtterance = utterance;
_coveredPositions = new bool[feature.MaxOriginPosition + 1];
FeatureInstances = new[] { feature };
indexPositions(feature);
FeatureKey = createFeatureKey();
}
private FeatureCover(FeatureCover previousCover, FeatureInstance extendingFeature)
{
OriginalUtterance = previousCover.OriginalUtterance;
_coveredPositions = previousCover._coveredPositions.ToArray();
FeatureInstances = previousCover.FeatureInstances.Concat(new[] { extendingFeature }).OrderBy(f => f.CoveredPositions.First()).ToArray();
indexPositions(extendingFeature);
FeatureKey = createFeatureKey();
}
internal IEnumerable <FeatureCover> Extend(FeatureInstance feature)
{
var hasOverlap = feature.CoveredPositions.Where(p => _coveredPositions[p]).Any();
if (hasOverlap)
{
return(new FeatureCover[0]);
}
return(new[] {
new FeatureCover(this, feature)
});
}
protected override IEnumerable <FeatureInstance> generateFeatures(ParsedUtterance expression, ComposedGraph graph)
{
var featureInstances = new List <FeatureInstance>();
var wordIndex = 0;
foreach (var word in expression.Words)
{
var feature = new UnigramFeature(word);
var featureInstance = new FeatureInstance(expression, feature, wordIndex);
featureInstances.Add(featureInstance);
++wordIndex;
}
return(featureInstances);
}
/// <inheritdoc/>
protected override IEnumerable <FeatureInstance> generateFeatures(ParsedUtterance expression, ComposedGraph graph)
{
var featureInstances = new List <FeatureInstance>();
var wordIndex = 0;
foreach (var word in expression.Words)
{
if (graph.HasEvidence(word))
{
var nodeFeature = new NodeFeature(wordIndex);
var instance = new FeatureInstance(expression, nodeFeature, wordIndex);
featureInstances.Add(instance);
}
++wordIndex;
}
return(featureInstances);
}
/// <inheritdoc/>
protected override void setMapping(FeatureInstance featureInstance, NodeMapping mapping)
{
//nothing to do
}
internal void SetMapping(FeatureInstance featureInstance, NodeMapping mapping)
{
setMapping(featureInstance, mapping);
}
abstract protected void setMapping(FeatureInstance featureInstance, NodeMapping mapping);