PLearn 0.1
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00001 // -*- C++ -*- 00002 00003 // ShiftAndRescaleFeatureRealFunction.cc 00004 // 00005 // Copyright (C) 2006 Pascal Vincent 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: Pascal Vincent 00036 00040 #include "ShiftAndRescaleFeatureRealFunction.h" 00041 00042 namespace PLearn { 00043 using namespace std; 00044 00045 PLEARN_IMPLEMENT_OBJECT( 00046 ShiftAndRescaleFeatureRealFunction, 00047 "A function that transforms a feature x yielding (x+shift)*scale", 00048 "Also handles missing values (NaN) by returning value_for_missing." 00049 ); 00050 00051 // ### Nothing to add here, simply calls build_ 00052 void ShiftAndRescaleFeatureRealFunction::build() 00053 { 00054 inherited::build(); 00055 build_(); 00056 } 00057 00058 void ShiftAndRescaleFeatureRealFunction::makeDeepCopyFromShallowCopy(CopiesMap& copies) 00059 { 00060 inherited::makeDeepCopyFromShallowCopy(copies); 00061 } 00062 00063 void ShiftAndRescaleFeatureRealFunction::declareOptions(OptionList& ol) 00064 { 00065 // ### Declare all of this object's options here. 00066 // ### For the "flags" of each option, you should typically specify 00067 // ### one of OptionBase::buildoption, OptionBase::learntoption or 00068 // ### OptionBase::tuningoption. If you don't provide one of these three, 00069 // ### this option will be ignored when loading values from a script. 00070 // ### You can also combine flags, for example with OptionBase::nosave: 00071 // ### (OptionBase::buildoption | OptionBase::nosave) 00072 00073 declareOption(ol, "shift", &ShiftAndRescaleFeatureRealFunction::shift, 00074 OptionBase::buildoption, 00075 "Evaluation will return (x[which_feature]+shift)*scale."); 00076 00077 declareOption(ol, "scale", &ShiftAndRescaleFeatureRealFunction::scale, 00078 OptionBase::buildoption, 00079 "Evaluation will return (x[which_feature]+shift)*scale."); 00080 00081 declareOption(ol, "value_for_missing", &ShiftAndRescaleFeatureRealFunction::value_for_missing, 00082 OptionBase::buildoption, 00083 "If x[which_feature] is missing (NaN), evaluation will return value_for_missing."); 00084 00085 // Now call the parent class' declareOptions 00086 inherited::declareOptions(ol); 00087 } 00088 00089 real ShiftAndRescaleFeatureRealFunction::evaluateFeature(real x) const 00090 { 00091 if(is_missing(x)) 00092 return value_for_missing; 00093 else 00094 return (x+shift)*scale; 00095 } 00096 00097 void ShiftAndRescaleFeatureRealFunction::build_() 00098 {} 00099 00100 00101 } // end of namespace PLearn 00102 00103 00104 /* 00105 Local Variables: 00106 mode:c++ 00107 c-basic-offset:4 00108 c-file-style:"stroustrup" 00109 c-file-offsets:((innamespace . 0)(inline-open . 0)) 00110 indent-tabs-mode:nil 00111 fill-column:79 00112 End: 00113 */ 00114 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :