这是一款平衡类的游戏，十分有意思。

It's kind of like Ballance. Challenging with great fun.

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然后介绍了非平衡类数据下分类算法性能的评价措施。

Section 4 introduces several performance measures for evaluating classifier algorithms in the presence of imbalanced data sets.

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摘要：最近在机器学习和数据挖掘上，非平衡类问题成为了一个研究热点。

Abstract: Recently, the problem of Class-imbalance has become a hotspot in machine learning and data mining.

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