root/applications/bdmtoolbox/mex/merger.cpp @ 463

#include <stat/merger.h>

#ifdef MEX
#include <itpp/itmex.h>
#include <mex/mex_logger.h>
#include <mex/mex_parser.h>
#include <mex/config2mxstruct.h>
#endif

/*! \file
\brief Merging static pdfs
Merger is a program/mex-function for static merging of given pdfs on given support.

In command line, it expected config file with the following structure:
\code
Sources = (... any epdf or mpdf  ...);
Support = {grid=([low1d,high1d],[low2d,high2d],...);
                   nbins=[bins1d,bins2d,... ]};
// OR
Support = {pdf={class='epdf',...};
                   nsamples=2};
Merger = {class="merger_base",...}
\endcode

In mex-file, the above structures (Sources,Support,Merger) are input arguments. Type >>merger for help.
*/

using namespace bdm;

#ifdef MEX
void mexFunction (int n_output, mxArray *output[], int n_input, const mxArray *input[])
{
        // Check the number of inputs and output arguments
        if (n_input != 3) mexErrMsgTxt ("Usage:\n"
                                            "result=merger(sources, support, merger)\n"
                                            "  sources= { struct('class','epdf'),... };  % cell of pdfs (epdfs or mpdfs) to be merged,\n"
                                            "  support= struct(\n"
                                            "           grid    = {[dim1_start,dim1_end], [dim2_start, dim2_end]...}  %support boundary \n"
                                            "           nbins   = [bins_in_dim1, bins_in_dim2,...]                    %fixed \n"
                                            "         === OR ==\n"
                                            "           pdf     = struct('class','epdf'); % pdf to draw samples from\n"
                                            "           nsamples= 100;                    % number of samples\n"
                                            "           );\n"
                                            "        If all elements are present,  (grid,nbins) is used;\n"
                                            "  merger = struct('class','merger_*');       % object to be used for merging,\n\n"
                                            "see documentation of classes epdf, mpdf, merger_base and their offsprings in BDM.");

        // LOAD CONFIG
        UImxArray Cfg;
        Cfg.addList (input[0], "Sources");
        Cfg.addGroup (input[1], "Support");
        Cfg.addGroup (input[2], "Merger");

        //DBG
        Cfg.writeFile ("merger.cfg");
#else
int main() {
        UIFile Cfg ("merger.cfg");
#endif
        // Sources
        Array<mpdf*> Sources;
        //abuse Mer to store sources
        Setting& _Sources = Cfg.lookup ("Sources");
        int Slen = _Sources.getLength();
        Sources.set_size (Slen);
        for (int i = 0; i < Slen; i++) {
                try {
                        mpdf* mtmp = UI::build<mpdf> (_Sources, i);
                        Sources (i) = mtmp;
                } catch (UIException) {
                        // it is not mpdf - see if it is epdf
                        try {
                                shared_ptr<epdf> etmp = UI::build<epdf> (_Sources, i);
                                if (etmp) {
                                        Sources (i) = new mepdf (etmp);
                                }
                        } catch (UIException e) {
                                it_error ("No mpdfs or epdfs found! " + string (e.what()));
                        } catch (std::exception e) {
                                it_error ("Error in UI at " + _Sources[i].getPath());
                        }
                } catch (std::exception e) {
                        it_error ("Error in UI at " + _Sources[i].getPath());
                }
        }

        merger_base* Merger = UI::build<merger_base> (Cfg, "Merger");

        // Support
        Setting & _Supp = Cfg.lookup ("Support");

        if (_Supp.exists ("grid") &&  _Supp.exists ("nbins")) {
                Array<vec> bounds (0);
                UI::get (bounds, _Supp, "grid");
                ivec nbins (0);
                UI::get (nbins, _Supp, "nbins");
                Merger->set_support (bounds, nbins);

        } else {
                if (_Supp.exists ("pdf") &&  _Supp.exists ("nsamples")) {
                        epdf *g0 = UI::build<epdf> (_Supp, "pdf");
                        int npoints = 100;
                        _Supp.lookupValue ("nsamples", npoints);
                        Merger->set_support (*g0, npoints);
                        delete g0;
                } else it_error ("Use either [grid,nbins] or [pdf,nsamples].");
        }
// COMPUTE RESULTS
        Merger->set_sources (Sources, true); // takes care of deletion of sources
        Merger->merge();

// save results
        Array<vec> source_vals (Sources.length());
        for (int i = 0;i < Sources.length();i++) {
                datalink_m2e dl;
                dl.set_connection (Sources (i)->_rv(), Sources (i)->_rvc(), Merger->_rv());

                vec ll (Merger->_Smp()._samples().length());
                for (int j = 0; j < Merger->_Smp()._samples().length(); j++) {
                        vec dt = dl.pushdown (Merger->_Smp()._samples() (j));
                        vec dtc = dl.get_cond (Merger->_Smp()._samples() (j));
                        ll (j) = Sources (i)->evallogcond (dt, dtc);
                }

                vec sll = exp (ll);

                source_vals (i) = sll / sum (sll);
        }

        vec ll (Merger->_Smp()._samples().length());
        for (int j = 0; j < Merger->_Smp()._samples().length(); j++) {
                ll (j) = Merger->evallog (Merger->_Smp()._samples() (j));
        }

        vec sll = exp (ll);

        vec mix_val = sll / sum (sll);


#ifdef MEX
        mxArray* tmp ;
        // Save results
        if (n_output > 0) {
                tmp = mxCreateStructMatrix (1, 1, 0, NULL);
                //support
                Array<vec> &samples = Merger->_Smp()._samples();
                if (samples.size() > 0) {
                        mxArray* fld = mxCreateDoubleMatrix (samples (0).length(), samples.size(), mxREAL);
                        Arrayvec2mxArray (samples, fld);
                        mxReplaceFieldNM (tmp, "support", fld);
                }

                //weights
                vec &w = Merger->_Smp()._w();
                mxArray* fldw = mxCreateDoubleMatrix (1, w.length(), mxREAL);
                vec2mxArray (w, fldw);
                mxReplaceFieldNM (tmp, "weights", fldw);

                //mixture values
                mxArray* fldm = mxCreateDoubleMatrix (1, w.length(), mxREAL);
                vec2mxArray (mix_val, fldm);
                mxReplaceFieldNM (tmp, "mix", fldm);

                // sources
                char srcstr[20];
                for (int i = 0;i < Sources.length();i++) {
                        sprintf (srcstr, "source%d", i + 1);
                        mxArray* fldw = mxCreateDoubleMatrix (1, source_vals (i).length(), mxREAL);
                        vec2mxArray (source_vals (i), fldw);
                        mxReplaceFieldNM (tmp, srcstr, fldw);
                }

                output[0] = tmp;
        }
#endif
}