The more the small probability events happen, the more the impact to text categorization results.
小概率事件发生的情况越多，对文本分类的结果影响也就越大。
The calculation amount is huge and the convergence velocity is low, especially in the calculating of small probability events.
但是该法计算量大，收敛速度慢，尤其是对小失效概率问题。
Therefore, the small probability of extreme events of great value-the tail risks should call peoples' attention.
所以，对小概率大数值的极端尾部风险事件要引起人们的高度重视。
Using the way, the sampling efficiency for small-probability events can be improved considerably, as can be seen from the contrasts shown in a group of results of simulation.
应用该方法可以大大提高小概率事件的抽样效率，文中给出一组仿真结果对照。
Using the way, the sampling efficiency for small-probability events can be improved considerably, as can be seen from the contrasts shown in a group of results of simulation.
应用该方法可以大大提高小概率事件的抽样效率，文中给出一组仿真结果对照。
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