  BESIII is a currently running tau-charm factory with the largest samples of
on threshold charm meson pairs, directly produced charmonia and some other
unique datasets at BEPCII collider. Machine learning techniques have been
employed to improve the performance of BESIII software. The studies for
reweighing MC, particle identification and cluster reconstruction for the CGEM
(Cylindrical Gas Electron Multiplier) inner tracker are presented.
