BBTK_DECLARE_INPUT(In, std::string );
BBTK_DECLARE_INPUT(Label, std::string );
BBTK_DECLARE_INPUT(Colour, std::vector<double> );
BBTK_DECLARE_INPUT(In, std::string );
BBTK_DECLARE_INPUT(Label, std::string );
BBTK_DECLARE_INPUT(Colour, std::vector<double> );