public static IDataScorerTransform GetScorer(
TScorerFactory scorer,
IPredictor predictor,
IDataView input,
string featureColName,
string groupColName,
IEnumerable <KeyValuePair <RoleMappedSchema.ColumnRole, string> > customColumns,
IHostEnvironment env,
RoleMappedSchema trainSchema,
IComponentFactory <IPredictor, ISchemaBindableMapper> mapperFactory = null)
{
Contracts.CheckValue(env, nameof(env));
env.CheckValueOrNull(scorer);
env.CheckValue(predictor, nameof(predictor));
env.CheckValue(input, nameof(input));
env.CheckValueOrNull(featureColName);
env.CheckValueOrNull(groupColName);
env.CheckValueOrNull(customColumns);
env.CheckValueOrNull(trainSchema);
var schema = new RoleMappedSchema(input.Schema, label: null, feature: featureColName, group: groupColName, custom: customColumns, opt: true);
var sc = GetScorerComponentAndMapper(predictor, scorer, schema, env, mapperFactory, out var mapper);
return(sc.CreateComponent(env, input, mapper, trainSchema));
}
/// <summary>
/// Determines the scorer component factory (if the given one is null or empty), and creates the schema bound mapper.
/// </summary>
private static TScorerFactory GetScorerComponentAndMapper(
IPredictor predictor,
TScorerFactory scorerFactory,
RoleMappedSchema schema,
IHostEnvironment env,
IComponentFactory<IPredictor, ISchemaBindableMapper> mapperFactory,
out ISchemaBoundMapper mapper)
{
Contracts.AssertValue(env);
var bindable = GetSchemaBindableMapper(env, predictor, mapperFactory, scorerFactory as ICommandLineComponentFactory);
env.AssertValue(bindable);
mapper = bindable.Bind(env, schema);
if (scorerFactory != null)
return scorerFactory;
return GetScorerComponent(mapper);
}
