namespace Microsoft.ML
{
    public static class CustomMappingCatalog : Object
    {
        public static CustomMappingEstimator<TSrc, TDst> CustomMapping<TSrc, TDst>(this TransformsCatalog catalog, Action<TSrc, TDst> mapAction, ? contractName, SchemaDefinition inputSchemaDefinition = null, SchemaDefinition outputSchemaDefinition = null)
            where TSrc, new(), class
            where TDst, new(), class;
    }
}