namespace Microsoft.ML
{
    public static class CustomMappingCatalog
    {
        public static StatefulCustomMappingEstimator<TSrc, TDst, TState> StatefulCustomMapping<TSrc, TDst, TState>(this TransformsCatalog catalog, Action<TSrc, TDst, TState> mapAction, Action<TState> stateInitAction, string contractName)
            where TSrc, new(), class
            where TDst, new(), class
            where TState, new(), class;
    }
}