So sánh phương pháp

	Kernel PCA	Locally Linear Embedding (LLE)
Lĩnh vực	Học máy	Học máy
Họ	Latent structure	Machine learning
Năm ra đời	1998	2000
Người khởi xướng	Schölkopf, B.; Smola, A. J.; Müller, K.-R.	Sam Roweis & Lawrence Saul
Loại	Nonlinear dimensionality reduction via kernel trick	Nonlinear manifold dimensionality reduction
Công trình gốc	Schölkopf, B., Smola, A. J., & Müller, K.-R. (1998). Nonlinear component analysis as a kernel eigenvalue problem. Neural Computation, 10(5), 1299–1319.	Roweis, S. T., & Saul, L. K. (2000). Nonlinear dimensionality reduction by locally linear embedding. Science, 290(5500), 2323–2326.
Tên gọi khác	KPCA, kernel PCA, nonlinear PCA via kernel trick, kernel eigenvalue decomposition	LLE, manifold learning, nonlinear dimensionality reduction, yerel doğrusal gömme
Liên quan	5	3
Tóm tắt	Kernel Principal Component Analysis (Kernel PCA) is a nonlinear dimensionality-reduction method introduced by Bernhard Schölkopf, Alexander Smola, and Klaus-Robert Müller in 1997–1998. It extends classical linear PCA to curved, non-linear data manifolds by implicitly mapping input data into a high-dimensional feature space via a kernel function, then performing standard PCA in that space — all without ever computing the mapping explicitly.	Locally linear embedding, introduced by Sam Roweis and Lawrence Saul in 2000, is a manifold-learning method for nonlinear dimensionality reduction. It assumes that although data may curve through a high-dimensional space, each point and its neighbours lie approximately on a flat patch. LLE captures each point as a weighted combination of its neighbours and then finds a low-dimensional layout that preserves those same local relationships, unrolling curved structure into a faithful low-dimensional map.