Introduction
See https://github.com/k2-fsa/icefall/pull/558
See https://tensorboard.dev/experiment/1ziQ2LFmQY2mt4dlUr5dyA/ for tensorboard logs
See https://github.com/k2-fsa/icefall/pull/558
See https://tensorboard.dev/experiment/1ziQ2LFmQY2mt4dlUr5dyA/ for tensorboard logs