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Stochastic nonlinear dimensionality reduction based on nearest neighbors
TIAN Shoucai, SUN Xili, LU Yonggang
Journal of Computer Applications
2016, 36 (2):
377-381.
DOI: 10.11772/j.issn.1001-9081.2016.02.0377
As linear dimensionality reduction methods usually cannot produce satisfactory low-dimensional embedding when applied to data with nonlinear structure, a new nonlinear dimensionality reduction method named NNSE was proposed to keep the local nearest neighbor information in the high-dimensional space. Firstly, the nearest neighbor points were found by calculating the Euclidean distance between the sample points in the high-dimensional space, then a random initial distribution of the data points was generated in the low-dimensional space. Secondly, by moving the data points towards the mean position of their nearest neighbors found in the high-dimensional space, the data point positions were iteratively optimized until the embedding becomes stable. In the comparison with a state-of-the-art nonlinear stochastic dimensionality reduction method named t-SNE (t-distributed Stochastic Neighbor Embedding), the low-dimensional embedding produced by NNSE method is similar to the visualization produced by the t-SNE method. However, it is shown that the NNSE method is superior to t-SNE in preserving the local nearest neighbor information in the low-dimensional embedding by using a quantitative indicator.
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