private IEnumerable <KeyValuePair <RoleMappedSchema.ColumnRole, string> > GetColumnRoles(
RoleMappedSchema testSchema, Schema scoredSchema)
{
switch (PredictionKind)
{
case PredictionKind.BinaryClassification:
yield return(RoleMappedSchema.CreatePair(RoleMappedSchema.ColumnRole.Label, testSchema.Label.Value.Name));
var scoreCol = EvaluateUtils.GetScoreColumn(Host, scoredSchema, null, nameof(BinaryClassifierMamlEvaluator.ArgumentsBase.ScoreColumn),
MetadataUtils.Const.ScoreColumnKind.BinaryClassification);
yield return(RoleMappedSchema.CreatePair(MetadataUtils.Const.ScoreValueKind.Score, scoreCol.Name));
// Get the optional probability column.
var probCol = EvaluateUtils.GetOptAuxScoreColumn(Host, scoredSchema, null, nameof(BinaryClassifierMamlEvaluator.Arguments.ProbabilityColumn),
scoreCol.Index, MetadataUtils.Const.ScoreValueKind.Probability, NumberType.Float.Equals);
if (probCol.HasValue)
{
yield return(RoleMappedSchema.CreatePair(MetadataUtils.Const.ScoreValueKind.Probability, probCol.Value.Name));
}
yield break;
case PredictionKind.Regression:
yield return(RoleMappedSchema.CreatePair(RoleMappedSchema.ColumnRole.Label, testSchema.Label.Value.Name));
scoreCol = EvaluateUtils.GetScoreColumn(Host, scoredSchema, null, nameof(RegressionMamlEvaluator.Arguments.ScoreColumn),
MetadataUtils.Const.ScoreColumnKind.Regression);
yield return(RoleMappedSchema.CreatePair(MetadataUtils.Const.ScoreValueKind.Score, scoreCol.Name));
yield break;
case PredictionKind.MultiClassClassification:
yield return(RoleMappedSchema.CreatePair(RoleMappedSchema.ColumnRole.Label, testSchema.Label.Value.Name));
scoreCol = EvaluateUtils.GetScoreColumn(Host, scoredSchema, null, nameof(MultiClassMamlEvaluator.Arguments.ScoreColumn),
MetadataUtils.Const.ScoreColumnKind.MultiClassClassification);
yield return(RoleMappedSchema.CreatePair(MetadataUtils.Const.ScoreValueKind.Score, scoreCol.Name));
yield break;
default:
throw Host.Except("Unrecognized prediction kind '{0}'", PredictionKind);
}
}
