epoch-15-avg-7
initialize from https://huggingface.co/marcoyang/icefall-multi-kd-pretrain-amp-fp16/blob/main/exp_md1000/iter-612000-avg-4.pt
WER:
    greedy: 2.44/5.71
    modified_beam_search: 2.35/5.6
EER:
    1.07
mAP:
    45.89