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function [conf, jobId] = bk_packDistMatrix(conf, varargin)
% BK_PACKGBDISTANCES
%
%
% Author:: Andrea Vedaldi
% AUTORIGHTS
% Copyright (C) 2008-09 Andrea Vedaldi
%
% This file is part of the VGG MKL Class and VGG MKL Det code packages,
% available in the terms of the GNU General Public License version 2.
conf_.blockPaths = '' ;
conf_.distMatrixPath = '' ;
conf_.kerPath = '' ;
conf_.kerDescrPath = '' ;
conf_.testMode = false ;
conf_.noClobber = false ;
if nargin < 1, conf = conf_ ; return ; end
conf = override(conf_, conf) ;
[jobId, taskId] = parallelDriver(varargin{:}, 'numNodes', 1) ;
if ~isnan(jobId) & isnan(taskId) ; return ; end
canSkip = conf.noClobber ;
canSkip = canSkip & (exist(conf.distMatrixPath, 'file') || ...
exist([conf.distMatrixPath '.mat'], 'file')) ;
if ~isempty(conf.kerPath)
canSkip = canSkip & (exist(conf.kerPath, 'file') || ...
exist([conf.kerPath '.mat'], 'file')) ;
end
if canSkip
fprintf('Skipping to avoid clobbeing.\n') ;
return ;
end
% load blocks
numRows = 0 ;
numCols = 0 ;
blocks = {} ;
for bi = 1:length(conf.blockPaths)
blocks{bi} = load(conf.blockPaths{bi}) ;
numRows = max(numRows, blocks{bi}.rowEnd) ;
numCols = max(numCols, blocks{bi}.colEnd) ;
end
% fill matrix
matrix = zeros(numRows, numCols) ;
for bi = 1:length(blocks)
block = blocks{bi} ;
rs = block.rowStart ;
re = block.rowEnd ;
cs = block.colStart;
ce = block.colEnd ;
matrix(rs:re, cs:ce) = block.matrix ;
end
% save back
fprintf('Saving ''%s''.\n', ...
conf.distMatrixPath) ;
ssave(conf.distMatrixPath, 'matrix') ;
% optionally compute kernel
if ~isempty(conf.kerPath)
if ~isempty(conf.kerDescrPath) & conf.testMode
fprintf('Loading ''%s''.\n', conf.kerDescrPath) ;
descr = load(conf.kerDescrPath) ;
mu = descr.mu ;
else
mu = 1 / mean(matrix(:)) ;
end
matrix = exp(- mu * matrix) ;
ker.matrix = matrix ;
ker.type = 'el2';
ker.feat = 'gb' ;
ker.pyrLevel = [] ;
ker.histName = '' ;
ker.name = 'el2_gb' ;
ker.mu = mu ;
% save back
fprintf('Saving ''%s''.\n', ...
conf.kerPath) ;
ssave(conf.kerPath, '-STRUCT', 'ker') ;
if ~isempty(conf.kerDescrPath) & ~conf.testMode
fprintf('Saving ''%s''.\n', ...
conf.kerDescrPath) ;
ker = rmfield(ker, 'matrix') ;
ssave(conf.kerDescrPath, '-STRUCT', 'ker') ;
end
end
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