PLearn 0.1
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00001 // -*- C++ -*- 00002 00003 // ARDBaseKernel.cc 00004 // 00005 // Copyright (C) 2006-2007 Nicolas Chapados 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: Nicolas Chapados 00036 00040 #include "ARDBaseKernel.h" 00041 00042 namespace PLearn { 00043 using namespace std; 00044 00045 PLEARN_IMPLEMENT_OBJECT( 00046 ARDBaseKernel, 00047 "Base class for kernels that carry out Automatic Relevance Determination (ARD)", 00048 "The purpose of this Kernel is to introduce utility options that are\n" 00049 "generally shared by Kernels that perform Automatic Relevance Determination\n" 00050 "(ARD). It does not introduce any specific behavior related to those\n" 00051 "options (since exactly where the ARD hyperparameters are used is very\n" 00052 "kernel-specific, this is left to derived classes).\n" 00053 "\n" 00054 "Note that to make its operations more robust when used with unconstrained\n" 00055 "optimization of hyperparameters, all hyperparameters of this kernel are\n" 00056 "specified in the inverse softplus domain. See IIDNoiseKernel for more\n" 00057 "explanations.\n" 00058 ); 00059 00060 ARDBaseKernel::ARDBaseKernel() 00061 : m_isp_signal_sigma(0.0), 00062 m_isp_global_sigma(0.0) 00063 { } 00064 00065 00066 //##### declareOptions ###################################################### 00067 00068 void ARDBaseKernel::declareOptions(OptionList& ol) 00069 { 00070 declareOption( 00071 ol, "isp_signal_sigma", 00072 &ARDBaseKernel::m_isp_signal_sigma, 00073 OptionBase::buildoption, 00074 "Inverse softplus of the global signal variance. Default value=0.0"); 00075 00076 declareOption( 00077 ol, "isp_global_sigma", 00078 &ARDBaseKernel::m_isp_global_sigma, 00079 OptionBase::buildoption, 00080 "Inverse softplus of the global length-scale. Note that if ARD is\n" 00081 "performed on input-specific sigmas, this hyperparameter should have a\n" 00082 "fixed value (and not be varied during the optimization). Default\n" 00083 "value=0.0.\n"); 00084 00085 declareOption( 00086 ol, "isp_input_sigma", 00087 &ARDBaseKernel::m_isp_input_sigma, 00088 OptionBase::buildoption, 00089 "If specified, contain input-specific length-scales that can be\n" 00090 "individually optimized for (these are the ARD hyperparameters).\n"); 00091 00092 // Now call the parent class' declareOptions 00093 inherited::declareOptions(ol); 00094 } 00095 00096 00097 void ARDBaseKernel::build() 00098 { 00099 // ### Nothing to add here, simply calls build_ 00100 inherited::build(); 00101 build_(); 00102 } 00103 00104 00105 void ARDBaseKernel::build_() 00106 { } 00107 00108 00109 void ARDBaseKernel::makeDeepCopyFromShallowCopy(CopiesMap& copies) 00110 { 00111 inherited::makeDeepCopyFromShallowCopy(copies); 00112 00113 deepCopyField(m_isp_input_sigma, copies); 00114 deepCopyField(m_input_sigma, copies); 00115 } 00116 00117 } // end of namespace PLearn 00118 00119 00120 /* 00121 Local Variables: 00122 mode:c++ 00123 c-basic-offset:4 00124 c-file-style:"stroustrup" 00125 c-file-offsets:((innamespace . 0)(inline-open . 0)) 00126 indent-tabs-mode:nil 00127 fill-column:79 00128 End: 00129 */ 00130 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :