The minimum attributes reduction set is expected to acquire the brief regulated set. This is taken as NP-hard Problem, which can be figured out through the heuristic algorithm.

为了获得简明的规则集，通常希望能找出最小的属性约简集，而求解最小约简是NP难问题，解决此类难题通常采用启发式算法以求得近似最优解。

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Before returning to the talks they said developed nations are trying to sideline the Kyoto Protocol a legally binding deal that set reduction targets for 2012.

VOA: standard.2009.12.17

The Strategic Arms Reduction Treaty (START), signed in 1991,expired in December, and President Obama set the goal of achieving a new treaty as one of his major priorities.

VOA: standard.2010.03.26

By 2020 the country aims to emit 40% less greenhouse gas than it did in 1990, exceeding the ambitious 30% reduction set by the European Union.

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Railtrack faces fines both this year and next unless it meets tough new train delay reduction targets set by regulator Tom Winsor.

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The Alberta government website says the province is the first jurisdiction to set mandatory reduction targets for greenhouse gas emissions.

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