说明：  SP和CoSaMP的主要区别在于添加新候选对象的方式。更精确地说，SP在每次迭代中只增加K个新的候选值，而CoSaMP则增加了2K个新的候选值，这使得SP的计算效率更高，但底层的分析更加复杂。
(As declared by the authors, the main difference between SP and CoSaMP is the manner of adding new candidates. More precisely, SP only adds K new candidates in each iteration, while CoSaMP adds 2K, which makes the SP computationally more efficient, but the underlying analysis more complex.)