PLearn 0.1
IdentityVariable.h
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00001 // -*- C++ -*-
00002 
00003 // PLearn (A C++ Machine Learning Library)
00004 // Copyright (C) 2004 Jasmin Lapalme
00005 
00006 // Redistribution and use in source and binary forms, with or without
00007 // modification, are permitted provided that the following conditions are met:
00008 // 
00009 //  1. Redistributions of source code must retain the above copyright
00010 //     notice, this list of conditions and the following disclaimer.
00011 // 
00012 //  2. Redistributions in binary form must reproduce the above copyright
00013 //     notice, this list of conditions and the following disclaimer in the
00014 //     documentation and/or other materials provided with the distribution.
00015 // 
00016 //  3. The name of the authors may not be used to endorse or promote
00017 //     products derived from this software without specific prior written
00018 //     permission.
00019 // 
00020 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00021 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00022 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00023 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00024 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00025 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00026 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00027 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00028 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00029 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00030 // 
00031 // This file is part of the PLearn library. For more information on the PLearn
00032 // library, go to the PLearn Web site at www.plearn.org
00033 
00034 #ifndef IdentityVariable_INC
00035 #define IdentityVariable_INC
00036 
00037 #include "UnaryVariable.h"
00038 
00039 namespace PLearn {
00040 using namespace std;
00041 
00042 class IdentityVariable: public UnaryVariable {
00043     typedef UnaryVariable inherited;
00044 
00045 public:
00047     IdentityVariable() {}
00048     IdentityVariable(Variable* input);
00049 
00050     PLEARN_DECLARE_OBJECT(IdentityVariable);
00051 
00052     virtual void recomputeSize(int& l, int& w) const;
00053     virtual void fprop();
00054     virtual void bprop();
00055     virtual void bbprop();
00056     virtual void symbolicBprop();
00057     virtual void rfprop();
00058     inline void setInput(Var the_input){ input = the_input;}
00059 };
00060 
00061 DECLARE_OBJECT_PTR(IdentityVariable);
00062 
00063 inline Var iden(Var v)
00064 { return new IdentityVariable(v); }
00065 
00066 } // end of namespace PLearn
00067 
00068 #endif 
00069 
00070 
00071 /*
00072   Local Variables:
00073   mode:c++
00074   c-basic-offset:4
00075   c-file-style:"stroustrup"
00076   c-file-offsets:((innamespace . 0)(inline-open . 0))
00077   indent-tabs-mode:nil
00078   fill-column:79
00079   End:
00080 */
00081 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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