PLearn 0.1
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00001 // -*- C++ -*- 00002 00003 // PLearn (A C++ Machine Learning Library) 00004 // Copyright (C) 1998 Pascal Vincent 00005 // Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio, Rejean Ducharme and University of Montreal 00006 // Copyright (C) 2001-2002 Nicolas Chapados, Ichiro Takeuchi, Jean-Sebastien Senecal 00007 // Copyright (C) 2002 Xiangdong Wang, Christian Dorion 00008 00009 // Redistribution and use in source and binary forms, with or without 00010 // modification, are permitted provided that the following conditions are met: 00011 // 00012 // 1. Redistributions of source code must retain the above copyright 00013 // notice, this list of conditions and the following disclaimer. 00014 // 00015 // 2. Redistributions in binary form must reproduce the above copyright 00016 // notice, this list of conditions and the following disclaimer in the 00017 // documentation and/or other materials provided with the distribution. 00018 // 00019 // 3. The name of the authors may not be used to endorse or promote 00020 // products derived from this software without specific prior written 00021 // permission. 00022 // 00023 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 00024 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 00025 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 00026 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00027 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 00028 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 00029 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 00030 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00031 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00032 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00033 // 00034 // This file is part of the PLearn library. For more information on the PLearn 00035 // library, go to the PLearn Web site at www.plearn.org 00036 00037 00038 /* ******************************************************* 00039 * $Id: AffineTransformWeightPenalty.h 3994 2005-08-25 13:35:03Z chapados $ 00040 * This file is part of the PLearn library. 00041 ******************************************************* */ 00042 00043 #ifndef AffineTransformWeightPenalty_INC 00044 #define AffineTransformWeightPenalty_INC 00045 00046 #include "UnaryVariable.h" 00047 #include <plearn/base/stringutils.h> 00048 00049 namespace PLearn { 00050 using namespace std; 00051 00052 00054 class AffineTransformWeightPenalty: public UnaryVariable 00055 { 00056 typedef UnaryVariable inherited; 00057 00058 protected: 00059 real weight_decay_; 00060 real bias_decay_; 00061 string penalty_type_; 00062 00063 public: 00065 AffineTransformWeightPenalty() 00066 : weight_decay_(0.0), bias_decay_(0.0), penalty_type_("L2_square") 00067 { 00068 string pt = lowerstring( penalty_type_ ); 00069 if( pt == "l1" ) 00070 penalty_type_ = "L1"; 00071 else if( pt == "l1_square" || pt == "l1 square" || pt == "l1square" ) 00072 penalty_type_ = "L1_square"; 00073 else if( pt == "l2_square" || pt == "l2 square" || pt == "l2square" ) 00074 penalty_type_ = "L2_square"; 00075 else if( pt == "l2" ) 00076 { 00077 PLWARNING("L2 penalty not supported, assuming you want L2 square"); 00078 penalty_type_ = "L2_square"; 00079 } 00080 else 00081 PLERROR("penalty_type_ \"%s\" not supported", penalty_type_.c_str()); 00082 } 00083 00084 AffineTransformWeightPenalty(Variable* affinetransform, real weight_decay, real bias_decay=0., string penalty_type="L2_square") 00085 : inherited(affinetransform, 1,1),weight_decay_(weight_decay),bias_decay_(bias_decay),penalty_type_(penalty_type) 00086 { 00087 string pt = lowerstring( penalty_type_ ); 00088 if( pt == "l1" ) 00089 penalty_type_ = "L1"; 00090 else if( pt == "l1_square" || pt == "l1 square" || pt == "l1square" ) 00091 penalty_type_ = "L1_square"; 00092 else if( pt == "l2_square" || pt == "l2 square" || pt == "l2square" ) 00093 penalty_type_ = "L2_square"; 00094 else if( pt == "l2" ) 00095 { 00096 PLWARNING("L2 penalty not supported, assuming you want L2 square"); 00097 penalty_type_ = "L2_square"; 00098 } 00099 else 00100 PLERROR("penalty_type_ \"%s\" not supported", penalty_type_.c_str()); 00101 } 00102 00103 PLEARN_DECLARE_OBJECT(AffineTransformWeightPenalty); 00104 static void declareOptions(OptionList &ol); 00105 00106 virtual void recomputeSize(int& l, int& w) const; 00107 virtual void fprop(); 00108 virtual void bprop(); 00109 }; 00110 00111 DECLARE_OBJECT_PTR(AffineTransformWeightPenalty); 00112 00115 inline Var affine_transform_weight_penalty(Var transformation, real weight_decay, real bias_decay=0, string penalty_type="L2_square") 00116 { return new AffineTransformWeightPenalty(transformation, weight_decay, bias_decay, penalty_type); } 00117 00118 } // end of namespace PLearn 00119 00120 #endif 00121 00122 00123 /* 00124 Local Variables: 00125 mode:c++ 00126 c-basic-offset:4 00127 c-file-style:"stroustrup" 00128 c-file-offsets:((innamespace . 0)(inline-open . 0)) 00129 indent-tabs-mode:nil 00130 fill-column:79 00131 End: 00132 */ 00133 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :