更新学习率时，分母为0.0，即group[‘t_total’]=0.0

# 报错
BERT/optimization.py", line 169, in step
    lr_scheduled = group['lr'] * schedule_fct(state['step']/(group['t_total']), group['warmup'])
ZeroDivisionError: float division by zero

解决方案：加入float(“1e-8”)

lr_scheduled = group['lr'] * schedule_fct(state['step']/(group['t_total']+float("1e-8")), group['warmup'])
                

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