LLE（Locally Linear Embedding）算法，即局部线性嵌入算法。该算法是针对非线性信号特征矢量维数的优化方法，这种维数优化并不是仅仅在数量上简单的约简，而是在保持原始数据性质不变的情况下，将高维空间的信号映射到低维空间上，即特征值的二次提取-LLE (Locally Linear Embedding) algorithm, local linear embedding algorithm. The algorithm is a method for optimizing nonlinear signal feature vector dimension, this dimension optimization is not just a simple reduction in the number, but the nature of the original data remain under the same circumstances, would signal a high-dimensional space mapped onto the low dimensional space, i.e., the second characteristic value extraction