PLearn 0.1
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00001 // -*- C++ -*- 00002 00003 // ManifoldKNNDistribution.h 00004 // 00005 // Copyright (C) 2007 Hugo Larochelle 00006 // 00007 // Redistribution and use in source and binary forms, with or without 00008 // modification, are permitted provided that the following conditions are met: 00009 // 00010 // 1. Redistributions of source code must retain the above copyright 00011 // notice, this list of conditions and the following disclaimer. 00012 // 00013 // 2. Redistributions in binary form must reproduce the above copyright 00014 // notice, this list of conditions and the following disclaimer in the 00015 // documentation and/or other materials provided with the distribution. 00016 // 00017 // 3. The name of the authors may not be used to endorse or promote 00018 // products derived from this software without specific prior written 00019 // permission. 00020 // 00021 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 00022 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 00023 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 00024 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00025 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 00026 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 00027 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 00028 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00029 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00030 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00031 // 00032 // This file is part of the PLearn library. For more information on the PLearn 00033 // library, go to the PLearn Web site at www.plearn.org 00034 00035 // Authors: Hugo Larochelle 00036 00040 #ifndef ManifoldKNNDistribution_INC 00041 #define ManifoldKNNDistribution_INC 00042 00043 #include <plearn_learners/distributions/UnconditionalDistribution.h> 00044 #include <plearn_learners/nearest_neighbors/GenericNearestNeighbors.h> 00045 00046 namespace PLearn { 00047 00048 // -*- C++ -*- 00049 00050 00055 class ManifoldKNNDistribution : public UnconditionalDistribution 00056 { 00057 typedef UnconditionalDistribution inherited; 00058 00059 public: 00060 //##### Public Build Options ############################################ 00061 00063 PP<GenericNearestNeighbors> knn_manifold; 00064 00067 PP<GenericNearestNeighbors> knn_density; 00068 00070 int manifold_dimensionality; 00071 00074 real min_sigma_square; 00075 00079 bool center_around_manifold_neighbors; 00080 00084 bool use_gaussian_distribution; 00085 00087 PP<PDistribution> density_learner; 00088 00089 public: 00090 //##### Public Member Functions ######################################### 00091 00093 // ### Make sure the implementation in the .cc 00094 // ### initializes all fields to reasonable default values. 00095 ManifoldKNNDistribution(); 00096 00097 00098 //##### UnconditionalDistribution Member Functions ###################### 00099 00101 virtual real log_density(const Vec& x) const; 00102 00104 virtual real survival_fn(const Vec& y) const; 00105 00107 virtual real cdf(const Vec& y) const; 00108 00110 virtual void expectation(Vec& mu) const; 00111 00113 virtual void variance(Mat& cov) const; 00114 00116 virtual void generate(Vec& y) const; 00117 00120 virtual void resetGenerator(long g_seed) const; 00121 00122 //##### PLearner Member Functions ####################################### 00123 00127 virtual void forget(); 00128 00132 virtual void train(); 00133 00134 00135 //##### PLearn::Object Protocol ######################################### 00136 00137 // Declares other standard object methods. 00138 PLEARN_DECLARE_OBJECT(ManifoldKNNDistribution); 00139 00140 // Simply calls inherited::build() then build_() 00141 virtual void build(); 00142 00144 virtual void makeDeepCopyFromShallowCopy(CopiesMap& copies); 00145 00146 protected: 00147 //##### Protected Options ############################################### 00148 00150 mutable Mat nearest_neighbors_manifold; 00152 mutable Vec nearest_neighbors_manifold_vec; 00154 mutable Mat nearest_neighbors_density; 00156 mutable Vec nearest_neighbors_density_vec; 00158 mutable Mat eig_vectors; 00160 mutable Vec eig_values; 00162 mutable Mat Ut, V; 00164 mutable Vec S; 00166 mutable Vec eig_vectors_projection; 00168 mutable Vec neighbors_mean; 00170 mutable Vec test_minus_mean; 00171 00173 mutable VMat density_learner_train_set; 00174 00175 protected: 00176 //##### Protected Member Functions ###################################### 00177 00179 static void declareOptions(OptionList& ol); 00180 00181 void computeLocalPrincipalComponents(const Vec& x, 00182 Vec& eig_values, 00183 Mat& eig_vectors) const; 00184 00185 private: 00186 //##### Private Member Functions ######################################## 00187 00189 void build_(); 00190 00191 private: 00192 //##### Private Data Members ############################################ 00193 00194 // The rest of the private stuff goes here 00195 }; 00196 00197 // Declares a few other classes and functions related to this class 00198 DECLARE_OBJECT_PTR(ManifoldKNNDistribution); 00199 00200 } // end of namespace PLearn 00201 00202 #endif 00203 00204 00205 /* 00206 Local Variables: 00207 mode:c++ 00208 c-basic-offset:4 00209 c-file-style:"stroustrup" 00210 c-file-offsets:((innamespace . 0)(inline-open . 0)) 00211 indent-tabs-mode:nil 00212 fill-column:79 00213 End: 00214 */ 00215 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :