protected override Aggregator GetAggregatorCore(RoleMappedSchema schema, string stratName)
{
return(new Aggregator(Host, LossFunction, schema.Weight != null, stratName));
}
protected override ISchemaBoundMapper BindCore(IChannel ch, RoleMappedSchema schema)
{
return(new SingleValueRowMapper(schema, this, new Schema(ScoreType, _quantiles)));
}
protected override Aggregator GetAggregatorCore(RoleMappedSchema schema, string stratName)
{
return(new Aggregator(Host, _aucCount, _numTopResults, _k, _p, _streaming, schema.Name == null ? -1 : schema.Name.Index, stratName));
}
protected abstract ISchemaBoundMapper BindCore(IChannel ch, RoleMappedSchema schema);
protected override ISchemaBoundMapper BindCore(IChannel ch, RoleMappedSchema schema)
{
var outputSchema = new ScoreMapperSchema(ScoreType, _scoreColumnKind);
return(new SingleValueRowMapper(schema, this, outputSchema));
}
public MultiClassClassifierScorer(IHostEnvironment env, Arguments args, IDataView data, ISchemaBoundMapper mapper, RoleMappedSchema trainSchema)
: base(args, env, data, WrapIfNeeded(env, mapper, trainSchema), trainSchema, RegistrationName, MetadataUtils.Const.ScoreColumnKind.MultiClassClassification,
MetadataUtils.Const.ScoreValueKind.Score, OutputTypeMatches, GetPredColType)
{
}
public virtual bool SaveAsOnnx(OnnxContext ctx, RoleMappedSchema schema, string[] outputNames) => false;
public static ISchemaBoundMapper WrapCore <T>(IHostEnvironment env, ISchemaBoundMapper mapper, RoleMappedSchema trainSchema)
{
Contracts.AssertValue(env);
env.AssertValue(mapper);
env.AssertValue(trainSchema);
env.Assert(mapper is ISchemaBoundRowMapper);
// Key values from the training schema label, will map to slot names of the score output.
var type = trainSchema.Schema.GetMetadataTypeOrNull(MetadataUtils.Kinds.KeyValues, trainSchema.Label.Index);
env.AssertValue(type);
env.Assert(type.IsVector);
// Wrap the fetching of the metadata as a simple getter.
ValueGetter <VBuffer <T> > getter =
(ref VBuffer <T> value) =>
{
trainSchema.Schema.GetMetadata(MetadataUtils.Kinds.KeyValues,
trainSchema.Label.Index, ref value);
};
return(LabelNameBindableMapper.CreateBound <T>(env, (ISchemaBoundRowMapper)mapper, type.AsVector, getter, MetadataUtils.Kinds.SlotNames, CanWrap));
}
/// <summary>
/// This function performs a number of checks on the inputs and, if appropriate and possible, will produce
/// a mapper with slots names on the output score column properly mapped. If this is not possible for any
/// reason, it will just return the input bound mapper.
/// </summary>
private static ISchemaBoundMapper WrapIfNeeded(IHostEnvironment env, ISchemaBoundMapper mapper, RoleMappedSchema trainSchema)
{
Contracts.CheckValue(env, nameof(env));
env.CheckValue(mapper, nameof(mapper));
env.CheckValueOrNull(trainSchema);
// The idea is that we will take the key values from the train schema label, and present
// them as slot name metadata. But there are a number of conditions for this to actually
// happen, so we test those here. If these are not
if (trainSchema == null || trainSchema.Label == null)
{
return(mapper); // We don't even have a label identified in a training schema.
}
var keyType = trainSchema.Schema.GetMetadataTypeOrNull(MetadataUtils.Kinds.KeyValues, trainSchema.Label.Index);
if (keyType == null || !CanWrap(mapper, keyType))
{
return(mapper);
}
// Great!! All checks pass.
return(Utils.MarshalInvoke(WrapCore <int>, keyType.ItemType.RawType, env, mapper, trainSchema));
}
protected override IEnumerable <KeyValuePair <RoleMappedSchema.ColumnRole, string> > GetInputColumnRolesCore(RoleMappedSchema schema)
{
foreach (var col in base.GetInputColumnRolesCore(schema))
{
if (!col.Key.Equals(RoleMappedSchema.ColumnRole.Label))
{
yield return(col);
}
else if (schema.Schema.TryGetColumnIndex(col.Value, out int labelIndex))
{
yield return(col);
}
}
if (_calculateDbi)
{
string feat = EvaluateUtils.GetColName(_featureCol, schema.Feature, DefaultColumnNames.Features);
if (!schema.Schema.TryGetColumnIndex(feat, out int featCol))
{
throw Host.ExceptUserArg(nameof(Arguments.FeatureColumn), "Features column '{0}' not found", feat);
}
yield return(RoleMappedSchema.ColumnRole.Feature.Bind(feat));
}
}
public ClusteringScorer(IHostEnvironment env, Arguments args, IDataView data, ISchemaBoundMapper mapper, RoleMappedSchema trainSchema)
: base(args, env, data, mapper, trainSchema, RegistrationName, MetadataUtils.Const.ScoreColumnKind.Clustering,
MetadataUtils.Const.ScoreValueKind.Score, OutputTypeMatches, GetPredColType)
{
}
public FoldResult(Dictionary <string, IDataView> metrics, Schema scoreSchema, RoleMappedData perInstance, RoleMappedSchema trainSchema)
{
Metrics = metrics;
ScoreSchema = scoreSchema;
PerInstanceResults = perInstance;
TrainSchema = trainSchema;
}
