收敛的

Preconditioned con- jugate gradient algorithm is a fast and accurate computational algorithm.

预条件共轭梯度法是种精确并且收敛迅速的计算方法。

The results of tests show that the new subsampling method outperforms other subsampling methods in less extrema and convergence performance of the normalized mutual information.

实验结果表明，新抽样方法可有地减少局部值点，提高归信息测度的收敛性能。