/// <summary>
/// Determine the default scorer for a schema bound mapper. This looks for text-valued ScoreColumnKind
/// metadata on the first column of the mapper. If that text is found and maps to a scorer loadable class,
/// that component is used. Otherwise, the GenericScorer is used.
/// </summary>
/// <param name="mapper">The schema bound mapper to get the default scorer.</param>.
/// <param name="suffix">An optional suffix to append to the default column names.</param>
public static TScorerFactory GetScorerComponent(
ISchemaBoundMapper mapper,
string suffix = null)
{
Contracts.AssertValue(mapper);
ComponentCatalog.LoadableClassInfo info = null;
DvText scoreKind = default;
if (mapper.OutputSchema.ColumnCount > 0 &&
mapper.OutputSchema.TryGetMetadata(TextType.Instance, MetadataUtils.Kinds.ScoreColumnKind, 0, ref scoreKind) &&
scoreKind.HasChars)
{
var loadName = scoreKind.ToString();
info = ComponentCatalog.GetLoadableClassInfo <SignatureDataScorer>(loadName);
if (info == null || !typeof(IDataScorerTransform).IsAssignableFrom(info.Type))
{
info = null;
}
}
Func <IHostEnvironment, IDataView, ISchemaBoundMapper, RoleMappedSchema, IDataScorerTransform> factoryFunc;
if (info == null)
{
factoryFunc = (env, data, innerMapper, trainSchema) =>
new GenericScorer(
env,
new GenericScorer.Arguments()
{
Suffix = suffix
},
data,
innerMapper,
trainSchema);
}
else
{
factoryFunc = (env, data, innerMapper, trainSchema) =>
{
object args = info.CreateArguments();
if (args is ScorerArgumentsBase scorerArgs)
{
scorerArgs.Suffix = suffix;
}
return((IDataScorerTransform)info.CreateInstance(
env,
args,
new object[] { data, innerMapper, trainSchema }));
};
}
return(ComponentFactoryUtils.CreateFromFunction(factoryFunc));
}
/// <summary>
/// Determine the default scorer for a schema bound mapper. This looks for text-valued ScoreColumnKind
/// metadata on the first column of the mapper. If that text is found and maps to a scorer loadable class,
/// that component is used. Otherwise, the GenericScorer is used.
/// </summary>
public static SubComponent <IDataScorerTransform, SignatureDataScorer> GetScorerComponent(ISchemaBoundMapper mapper)
{
Contracts.AssertValue(mapper);
string loadName = null;
DvText scoreKind = default;
if (mapper.OutputSchema.ColumnCount > 0 &&
mapper.OutputSchema.TryGetMetadata(TextType.Instance, MetadataUtils.Kinds.ScoreColumnKind, 0, ref scoreKind) &&
scoreKind.HasChars)
{
loadName = scoreKind.ToString();
var info = ComponentCatalog.GetLoadableClassInfo <SignatureDataScorer>(loadName);
if (info == null || !typeof(IDataScorerTransform).IsAssignableFrom(info.Type))
{
loadName = null;
}
}
if (loadName == null)
{
loadName = GenericScorer.LoadName;
}
return(new SubComponent <IDataScorerTransform, SignatureDataScorer>(loadName));
}