Logger module
  originally developed for DeepMD-kit
  by Han Wang, Linfeng Zhang, Jiequn Han, and Weinan E. 
  "DeePMD-kit: A deep learning package for many-body potential energy representation 
  and molecular dynamics." Computer Physics Communications 228 (2018): 178-184
  licensed under GNU LGPLv3.0.
  See https://github.com/deepmodeling/deepmd-kit for details.

