The motivation and the description of the Map2RMM library is "Imaging particle collision data for event classification using machine learning", S.Chekanov, arXiv:1805.11650 (NIMA 931 (2019) 92 (https://doi.org/10.1016/j.nima.2019.04.031), ANL-HEP-144006). A follow up of this method is described in: S.V.Chekanov, Machine learning using rapidity-mass matrices for event classification problems in HEP. ANL-HEP-147750. arxiv.org:1810.06669 A short progress report is presented in the talk "Machine learning for event classification and automated discovery of new physics at the LHC experiments", PS April Meeting 2019, April 13–16, 2019; Denver, Colorado (APR19/Session/T13.6)).