dimension reduction的用法和樣例：
例句
- The singular perturbation algorithm is proposed to reduce the system dimension.
採用奇異攝動演算法使系統降維。 - Maximum likelihood performs a nonlinear dimensionality reduction, choosing permutations that compact the permuted image vectors into a volumetrically minimal subspace.
極大似然方法實現了非線性的降維，將向量壓縮到一個低維空間。
