/// <summary>
/// Transfers namespace data to native space.
/// </summary>
/// <typeparam name="T">The feature type.</typeparam>
/// <param name="namespaceDense">The dense namespace.</param>
public void Visit <T>(INamespaceDense <T> namespaceDense)
{
Contract.Requires(namespaceDense != null);
Contract.Requires(namespaceDense.DenseFeature != null);
Contract.Requires(namespaceDense.DenseFeature.Value != null);
this.featureGroup = namespaceDense.FeatureGroup ?? '\0';
this.namespaceHash = namespaceDense.Name == null?
this.vw.HashSpace(this.featureGroup.ToString()) :
this.vw.HashSpace(this.featureGroup + namespaceDense.Name);
this.namespaceBuilder = this.builder.AddNamespace(this.featureGroup);
this.namespaceBuilder.PreAllocate(namespaceDense.DenseFeature.Value.Count);
var i = 0;
// support anchor feature
if (namespaceDense.DenseFeature.AddAnchor)
{
this.namespaceBuilder.AddFeature(this.namespaceHash, 1);
i++;
}
foreach (var v in namespaceDense.DenseFeature.Value)
{
this.namespaceBuilder.AddFeature(
(uint)(this.namespaceHash + i),
(float)Convert.ToDouble(v));
i++;
}
}
/// <summary>
/// Initializes a new <see cref="VowpalWabbitInterfaceVisitor"/> instance.
/// </summary>
/// <param name="vw">The associated vowpal wabbit instance.</param>
public VowpalWabbitInterfaceVisitor(VowpalWabbit vw)
{
this.vw = vw;
this.builder = null;
this.namespaceBuilder = null;
this.featureGroup = '\0';
this.namespaceHash = 0;
}
public void Visit(INamespaceSparse namespaceSparse)
{
// compute shared namespace hash
this.namespaceHash = namespaceSparse.Name == null?
this.vw.HashSpace(namespaceSparse.FeatureGroup.ToString()) :
this.vw.HashSpace(namespaceSparse.FeatureGroup + namespaceSparse.Name);
this.featureGroup = (byte)(namespaceSparse.FeatureGroup ?? 0);
this.namespaceBuilder = this.builder.AddNamespace(this.featureGroup);
// Visit each feature
foreach (var element in namespaceSparse.Features)
{
element.Visit();
}
}
public void Visit <T>(INamespaceDense <T> namespaceDense)
{
this.featureGroup = (byte)(namespaceDense.FeatureGroup ?? 0);
this.namespaceHash = namespaceDense.Name == null?
this.vw.HashSpace(this.featureGroup.ToString()) :
this.vw.HashSpace(this.featureGroup + namespaceDense.Name);
this.namespaceBuilder = this.builder.AddNamespace(this.featureGroup);
var i = 0;
foreach (var v in namespaceDense.DenseFeature.Value)
{
this.namespaceBuilder.AddFeature(
(uint)(this.namespaceHash + i),
(float)Convert.ToDouble(v));
i++;
}
}
