private BindingsImpl(DataViewSchema input, ISchemaBoundRowMapper mapper, string suffix, string scoreColumnKind,
bool user, int scoreColIndex, DataViewType predColType, string predictedLabelColumnName = DefaultColumnNames.PredictedLabel)
: base(input, mapper, suffix, user, predictedLabelColumnName)
{
Contracts.AssertNonEmpty(scoreColumnKind);
Contracts.Assert(DerivedColumnCount == 1);
ScoreColumnIndex = scoreColIndex;
ScoreColumnKind = scoreColumnKind;
PredColType = predColType;
_getScoreColumnKind = GetScoreColumnKind;
_getScoreValueKind = GetScoreValueKind;
// REVIEW: This logic is very specific to multiclass, which is deeply
// regrettable, but the class structure as designed and the status of this schema
// bearing object makes pushing the logic into the multiclass scorer almost impossible.
if (predColType is KeyDataViewType predColKeyType && predColKeyType.Count > 0)
{
var scoreColMetadata = mapper.OutputSchema[scoreColIndex].Annotations;
var trainLabelColumn = scoreColMetadata.Schema.GetColumnOrNull(AnnotationUtils.Kinds.TrainingLabelValues);
if (trainLabelColumn?.Type is VectorDataViewType trainLabelColVecType && (ulong)trainLabelColVecType.Size == predColKeyType.Count)
{
Contracts.Assert(trainLabelColVecType.Size > 0);
_predColMetadata = Utils.MarshalInvoke(_keyValueMetadataFromMetadataMethodInfo, trainLabelColVecType.RawType,
scoreColMetadata, trainLabelColumn.Value);
}
}
}
private static AnnotationInfo GetAnnotationInfo <T>(string kind, DataViewSchema.Annotations annotations)
{
T value = default;
annotations.GetValue(kind, ref value);
return(new AnnotationInfo <T>(kind, value, annotations.Schema[kind].Type));
}
internal static DataViewRow AnnotationsAsRow(DataViewSchema.Annotations annotations)
{
Contracts.CheckValue(annotations, nameof(annotations));
return(new AnnotationRow(annotations));
}
public AnnotationRow(DataViewSchema.Annotations annotations)
{
Contracts.AssertValue(annotations);
_annotations = annotations;
}
private static DataViewSchema.Annotations KeyValueMetadataFromMetadata <T>(DataViewSchema.Annotations meta, DataViewSchema.Column metaCol)
{
Contracts.AssertValue(meta);
Contracts.Assert(metaCol.Type.RawType == typeof(T));
var builder = new DataViewSchema.Annotations.Builder();
builder.Add(AnnotationUtils.Kinds.KeyValues, metaCol.Type, meta.GetGetter <T>(metaCol));
return(builder.ToAnnotations());
}
