gistfile1.txt

/** @brief the class LocalTangentSpaceAlignment used to preprocess
 * data using Local Tangent Space Alignment (LTSA) algorithm as described in:
 *
 * Z. Zhang, H. Zha, Principal manifolds and nonlinear dimensionality
 * reduction via tangent space alignment, SIAM J. Sci. Comput. 26 (1)
 * (2004) 313-338.
 *
 * The stated eigenproblem is solved in the same way as
 * CLocallyLinearEmbedding (LAPACK or ARPACK if available).
 *
 * The local tangent space alignment step is parallel. Neighborhood
 * determination is not parallel as in CLocallyLinearEmbedding.
 *
 * This algorithm is pretty stable for variations of k parameter but
 * be sure it is set with a consistent value (at least 3-5) for reasonable
 * results.
 */