PLearn 0.1
VMat.cc
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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 and University of Montreal
00006 //
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 /* *******************************************************
00039  * $Id: VMat.cc 8607 2008-02-29 17:11:46Z nouiz $ *
00040  * This file is part of the PLearn library.               *
00041  ******************************************************** */
00042 #include "VMat.h"
00043 #include <plearn/io/fileutils.h>
00044 
00045 #include "MemoryVMatrix.h"
00046 #include "FileVMatrix.h"
00047 #include "SelectRowsVMatrix.h"
00048 #include "SelectColumnsVMatrix.h"
00049 #include "SelectRowsFileIndexVMatrix.h"
00050 #include <plearn/io/MatIO.h>
00051 
00052 // TODO-PPath   : this class is now PPath compliant
00053 // TODO-PStream : this class is now PStream compliant
00054 
00055 namespace PLearn {
00056 using namespace std;
00057 
00060 VMat::VMat() {}
00061 VMat::VMat(VMatrix* d): PP<VMatrix>(d) {}
00062 VMat::VMat(const VMat& d) :PP<VMatrix>(d) {}
00063 VMat::VMat(const Mat& datamat): PP<VMatrix>(new MemoryVMatrix(datamat)) {}
00064 VMat::~VMat() {}
00065 
00066 VMat VMat::subMatRows(int i, int l) const
00067 {
00068     VMat res = ptr->subMat(i,0,l,width());
00069     res->defineSizes(ptr->inputsize(), ptr->targetsize(), ptr->weightsize());
00070     return res;
00071 }
00072 
00073 VMat VMat::rows(TVec<int> rows_indices) const
00074 { return new SelectRowsVMatrix(*this, rows_indices); }
00075 
00076 VMat VMat::rows(Vec rows_indices) const
00077 { return new SelectRowsVMatrix(*this, rows_indices); }
00078 
00079 VMat VMat::rows(const PPath& indexfile) const
00080 { return new SelectRowsFileIndexVMatrix(*this, indexfile); }
00081 
00082 VMat VMat::columns(TVec<int> columns_indices) const
00083 { return new SelectColumnsVMatrix(*this, columns_indices); }
00084 
00085 VMat VMat::columns(Vec columns_indices) const
00086 { return new SelectColumnsVMatrix(*this, columns_indices); }
00087 
00089 // precompute //
00091 void VMat::precompute() {
00092     VMat backup = *this;
00093     *this = new MemoryVMatrix(Mat(*this));
00094     (*this)->setFieldInfos( backup->getFieldInfos() );
00095 
00096     // We restore the sizes info (lost in the Mat conversion).
00097     // Note that there would probably be more info to restore (like
00098     // field infos, string mappings, ...).
00099     (*this)->copySizesFrom(backup);
00100 
00101     //TODO
00102     //(*this)->copyFieldInfosFrom(backup);
00103 }
00104 
00105 void VMat::precompute(const PPath& pmatfile, bool use_existing_file)
00106 {
00107     VMat backup = *this;
00108     Array<VMField> infos = (*this)->getFieldInfos();
00109     if(!use_existing_file || !pathexists(pmatfile))
00110         save(pmatfile);
00111     *this = new FileVMatrix(pmatfile);
00112     (*this)->setFieldInfos( infos );
00113     (*this)->copySizesFrom(backup);
00114     // TODO same as above
00115 }
00116 
00117 
00118 template <>
00119 void deepCopyField(VMat& field, CopiesMap& copies)
00120 {
00121     if (field)
00122         field = static_cast<VMatrix*>(field->deepCopy(copies));
00123 }
00124 
00126 // loadAsciiAsVMat //
00128 VMat loadAsciiAsVMat(const PPath& filename)
00129 {
00130     Mat m;
00131     TVec<string> fn;
00132     TVec< map<string,real> > map_sr;  // String -> real mappings.
00133     int inputsize = -1;
00134     int targetsize = -1;
00135     int weightsize = -1;
00136     loadAscii(filename, m, fn, inputsize, targetsize, weightsize, &map_sr);
00137     VMat vm = new MemoryVMatrix(m);
00138     if(inputsize>=0)
00139         vm->defineSizes(inputsize,targetsize,weightsize);
00140     else
00141         vm->defineSizes(m.width(),0,0);
00142 
00143     vm->updateMtime(filename);
00144     // Set the discovered string -> real mappings.
00145     for (int i = 0; i < map_sr.length(); i++) {
00146         vm->setStringMapping(i, map_sr[i]);
00147     }
00148     for(int i=0;i<fn.size();i++)
00149         vm->declareField(i, fn[i]);
00150     return vm;
00151 }
00152 
00153 } // end of namespace PLearn
00154 
00155 
00156 /*
00157   Local Variables:
00158   mode:c++
00159   c-basic-offset:4
00160   c-file-style:"stroustrup"
00161   c-file-offsets:((innamespace . 0)(inline-open . 0))
00162   indent-tabs-mode:nil
00163   fill-column:79
00164   End:
00165 */
00166 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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