Efficient prediction of attosecond two-colour pulses from an X-ray free-electron laser with machine learning oleh Karim K. Alaa El-Din, Oliver G. Alexander, Leszek J. Frasinski, Florian Mintert, Zhaoheng Guo, Joseph Duris, Zhen Zhang, David B. Cesar, Paris Franz, Taran Driver, Peter Walter, James P. Cryan, Agostino Marinelli, Jon P. Marangos, Rick Mukherjee