private/xsvm_subject_loop.m (c0e4506) - SVMCrossVal.git

xsvm_subject_loop.m

%% subject loop
function decode = xsvm_subject_loop(header,subjectdata,svmopts)

nSubjects = numel(subjectdata);

decode = struct;
decode.decodePerformance = [];
decode.rawTimeCourse     = [];

disp(sprintf('computinig additional datastructs for %u subjects',nSubjects));

timeline = header.timeline;

for subjectDataID = 1:nSubjects
    currentSubject = subjectdata{subjectDataID};
    timePointArgs.pst           = currentSubject.pst;
    timePointArgs.labelMap      = LabelMap(header.classDef.labelCells,header.classDef.conditionCells);
    timePointArgs.eventList     = header.classDef.eventMatrix;

timePointMatrix{subjectDataID} = buildTimePointMatrix(timeline,timePointArgs);
end

timeLineStart   = timeline.frameShiftStart;
timeLineEnd     = timeline.frameShiftEnd;

addpath 'libsvm-mat-2.88-1';

display(sprintf('%u -fold cross validation for %u timeslices.\n',nSubjects,size(1:timeLineEnd-timeLineStart+1,2)));
disp(sprintf('Press ANY-Key to continue.\n Use Retrun if your Keyboard lacks the ANY-Key.'));
pause
for timeIndex = 1:timeLineEnd-timeLineStart+1
    cross_value = [];
    for validationSubjectID = 1:nSubjects
        svm_train_label = [];
        svm_train_data  = [];
        svm_validation_label = [];
        svm_validation_data  = [];
        for subjectDataID = 1:nSubjects
            svmstruct = calculateSVMTables(timePointMatrix{subjectDataID},timeIndex);
            if subjectDataID == validationSubjectID
                svm_validation_label = svmstruct.svmlabel;
                svm_validation_data  = svmstruct.svmdata;
            else
                svm_train_label = [svm_train_label; svmstruct.svmlabel];
                svm_train_data  = [svm_train_data;  svmstruct.svmdata];
            end
        end
        
%         display(sprintf('Time %u: validation subject: %u, validation set size %g, training set size %g with %u subjects',...
%             timeIndex, validationSubjectID, numel(svm_validation_label), numel(svm_train_label),nSubjects-1));
        
        svmmodel = svmtrain(svm_train_label,svm_train_data,svmopts);
        
        [plabel accuracy dvalue] = svmpredict(svm_validation_label,svm_validation_data,svmmodel,'');
        cross_value = [cross_value accuracy(1)];
        
    end
    decode.decodePerformance = [decode.decodePerformance mean(cross_value)];
%     decode.rawTimeCourse = [decode.rawTimeCourse cross_value];
    
%         decode.(namehelper)         = calculateDecodePerformance(header,currentSubject,svmopts);
% 
%         display('... done');
%         display('restoring warnings');
%         warning(warning_state);
% 
%         decode.decodePerformance    = [decode.decodePerformance decode.(namehelper).decodePerformance];
%         decode.rawTimeCourse        = [decode.rawTimeCourse decode.(namehelper).rawTimeCourse];

%         assignin('base','decode',decode);

%         if RANDOMIZE_DATAPOINTS
        %         rndindex  = randperm(length(svmlabel));
        %         svmdata   = svmdata(rndindex,:);
        %         svmlabel  = svmlabel(rndindex);
        %         end

end
end

SVMCrossVal.git

nSubject-fold cross validation. visualization still missing.