PLearn 0.1
OneHotVMatrix.h
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00001 // -*- C++ -*-
00002 
00003 // PLearn (A C++ Machine Learning Library)
00004 // Copyright (C) 1998 Pascal Vincent
00005 // Copyright (C) 1999-2001 Pascal Vincent, Yoshua Bengio, Rejean Ducharme and University of Montreal
00006 // Copyright (C) 2002 Pascal Vincent, Julien Keable, Xavier Saint-Mleux
00007 //
00008 // Redistribution and use in source and binary forms, with or without
00009 // modification, are permitted provided that the following conditions are met:
00010 //
00011 //  1. Redistributions of source code must retain the above copyright
00012 //     notice, this list of conditions and the following disclaimer.
00013 //
00014 //  2. Redistributions in binary form must reproduce the above copyright
00015 //     notice, this list of conditions and the following disclaimer in the
00016 //     documentation and/or other materials provided with the distribution.
00017 //
00018 //  3. The name of the authors may not be used to endorse or promote
00019 //     products derived from this software without specific prior written
00020 //     permission.
00021 //
00022 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00023 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00024 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00025 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00026 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00027 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00028 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00029 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00030 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00031 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00032 //
00033 // This file is part of the PLearn library. For more information on the PLearn
00034 // library, go to the PLearn Web site at www.plearn.org
00035 
00036 
00037 /* *******************************************************
00038  * $Id: OneHotVMatrix.h 9456 2008-09-15 17:33:17Z tihocan $
00039  ******************************************************* */
00040 
00041 
00044 #ifndef OneHotVMatrix_INC
00045 #define OneHotVMatrix_INC
00046 
00047 #include "SourceVMatrix.h"
00048 #include "VMat.h"
00049 
00050 namespace PLearn {
00051 using namespace std;
00052 
00053 class OneHotVMatrix: public SourceVMatrix
00054 {
00055     typedef SourceVMatrix inherited;
00056 
00057 public:
00058 
00059     int nclasses;
00060     real cold_value;
00061     real hot_value;
00062     int index;
00063 
00064 public:
00065 
00066     // ******************
00067     // *  Constructors  *
00068     // ******************
00069 
00071     OneHotVMatrix(bool call_build_ = false);
00072 
00074     OneHotVMatrix(VMat the_source, int the_nclasses,
00075                   real the_cold_value=0.0, real the_host_value=1.0,
00076                   int the_index=-1, bool call_build_ = false);
00077 
00078     PLEARN_DECLARE_OBJECT(OneHotVMatrix);
00079 
00080 protected:
00081 
00082     virtual void getNewRow(int i, const Vec& samplevec) const;
00083     static void declareOptions(OptionList &ol);
00084 
00089     void updateNClassesAndWidth();
00090 
00091 public:
00092 
00093     virtual void build();
00094 
00095     virtual void reset_dimensions()
00096     {
00097         source->reset_dimensions();
00098         width_ = source->width() + nclasses - 1;
00099         length_ = source->length();
00100     }
00101     virtual real dot(int i1, int i2, int inputsize) const;
00102     virtual real dot(int i, const Vec& v) const;
00103 private:
00104     void build_();
00105 };
00106 
00107 inline VMat onehot(VMat the_source, int nclasses,
00108                    real cold_value=0.0, real hot_value=1.0, int index=-1,
00109                    bool call_build_=false)
00110 { return new OneHotVMatrix(the_source, nclasses, cold_value, hot_value, index,
00111                            call_build_); }
00112 
00113 DECLARE_OBJECT_PTR(OneHotVMatrix);
00114 
00115 } // end of namespace PLearn
00116 #endif
00117 
00118 
00119 /*
00120   Local Variables:
00121   mode:c++
00122   c-basic-offset:4
00123   c-file-style:"stroustrup"
00124   c-file-offsets:((innamespace . 0)(inline-open . 0))
00125   indent-tabs-mode:nil
00126   fill-column:79
00127   End:
00128 */
00129 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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