PLearn 0.1
ConstrainVariable.h
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00001 // -*- C++ -*-
00002 
00003 // ConstrainVariable.h
00004 //
00005 // Copyright (C) 2008 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 
00039 #ifndef ConstrainVariable_INC
00040 #define ConstrainVariable_INC
00041 
00042 #include <plearn/var/UnaryVariable.h>
00043 
00044 namespace PLearn {
00045 using namespace std;
00046 
00047 
00048 class ConstrainVariable: public UnaryVariable
00049 {
00050     typedef UnaryVariable inherited;
00051 
00052 public:
00053     double max_rowsum;
00054 
00056     ConstrainVariable();
00057 
00058     ConstrainVariable(Variable* input, bool call_build_ = true);
00059 
00060     PLEARN_DECLARE_OBJECT(ConstrainVariable);
00061 
00062     virtual void build();
00063 
00064     virtual void recomputeSize(int& l, int& w) const;
00065     virtual void fprop();
00066     virtual void bprop();
00068     virtual void bbprop();
00069     virtual void symbolicBprop();
00070     virtual void rfprop();
00071 
00072     inline real box_constrain(real x) const
00073     { return x<min_value ?min_value :(x>max_value ?max_value :x); }
00074 
00075 private:
00076 
00077     void build_();
00078 
00079 };
00080 
00081 DECLARE_OBJECT_PTR(ConstrainVariable);
00082 
00083 inline Var diag(Var v)
00084 { return new ConstrainVariable(v); }
00085 
00086 } // end of namespace PLearn
00087 
00088 #endif 
00089 
00090 
00091 /*
00092   Local Variables:
00093   mode:c++
00094   c-basic-offset:4
00095   c-file-style:"stroustrup"
00096   c-file-offsets:((innamespace . 0)(inline-open . 0))
00097   indent-tabs-mode:nil
00098   fill-column:79
00099   End:
00100 */
00101 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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