Public Member Functions | Protected Member Functions | Static Protected Member Functions

CHessianLocallyLinearEmbedding Class Reference

Detailed Description

the class HessianLocallyLinearEmbedding used to preprocess data using Hessian Locally Linear Embedding algorithm described in

Donoho, D., & Grimes, C. (2003). Hessian eigenmaps: new tools for nonlinear dimensionality reduction. Proceedings of National Academy of Science (Vol. 100, pp. 5591-5596).

Stated eigenproblem is solved in the same way as in CLocallyLinearEmbedding (LAPACK or ARPACK if available).

The hessian estimation step is parallel and neighborhood determination too as in CLocallyLinearEmbedding.

Be sure k value is set with at least 1+[target dim]+1/2 [target_dim]*[1 + target dim], e.g. greater than 6 for target dimensionality of 2.

Definition at line 42 of file HessianLocallyLinearEmbedding.h.

Inheritance diagram for CHessianLocallyLinearEmbedding:
Inheritance graph

List of all members.

Public Member Functions

 CHessianLocallyLinearEmbedding ()
virtual ~CHessianLocallyLinearEmbedding ()
virtual const char * get_name () const

Protected Member Functions

virtual SGMatrix< float64_tconstruct_weight_matrix (CSimpleFeatures< float64_t > *simple_features, float64_t *W_matrix, SGMatrix< int32_t > neighborhood_matrix)

Static Protected Member Functions

static void * run_hessianestimation_thread (void *p)

Constructor & Destructor Documentation


Definition at line 74 of file HessianLocallyLinearEmbedding.cpp.

~CHessianLocallyLinearEmbedding (  )  [virtual]


Definition at line 79 of file HessianLocallyLinearEmbedding.cpp.

Member Function Documentation

SGMatrix< float64_t > construct_weight_matrix ( CSimpleFeatures< float64_t > *  simple_features,
float64_t W_matrix,
SGMatrix< int32_t >  neighborhood_matrix 
) [protected, virtual]


construct weight matrix

simple_features features to be used
W_matrix weight matrix
neighborhood_matrix matrix containing neighbor idxs

Reimplemented from CLocallyLinearEmbedding.

Definition at line 88 of file HessianLocallyLinearEmbedding.cpp.

const char * get_name (  )  const [virtual]

get name

Reimplemented from CLocallyLinearEmbedding.

Definition at line 83 of file HessianLocallyLinearEmbedding.cpp.

void * run_hessianestimation_thread ( void *  p  )  [static, protected]


run hessian estimation thread

p thread params

Definition at line 192 of file HessianLocallyLinearEmbedding.cpp.

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