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function [conf, jobId] = bk_calcDistMatrixBlock(conf, varargin)
% BK_CALCDISTMATRIXBLOCK
%
% 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_.gbPaths = '' ;
conf_.gbTestPaths = '' ;
conf_.blockDefs = struct ;
conf_.blockPaths = '' ;
conf_.noClobber = false ;
conf_.distFn = [] ;
if nargin < 1, conf = conf_ ; return ; end
conf = override(conf_, conf) ;
[jobId, taskId] = parallelDriver(varargin{:}, 'numNodes', length(conf.blockDefs)) ;
if ~isnan(jobId) & isnan(taskId) ; return ; end
for bi = 1:length(conf.blockDefs)
% try to lock the Block
locked = parallelLock(bi, varargin{:}) ;
if ~locked, continue ; end
block = conf.blockDefs(bi) ;
blockPath = conf.blockPaths{bi} ;
fprintf('Computing block %d (%d-%d, %d-%d).\n', ...
bi, block.rowStart, block.rowEnd, ...
block.colStart, block.colEnd) ;
% No clobber logic
if conf.noClobber & checkFile(blockPath)
sprintf('\tSkipping to avoid clobbering ''%''.\n', blockPath) ;
continue ;
end
% Load descriptors for range of images in block
row = block.rowStart : block.rowEnd ;
col = block.colStart : block.colEnd ;
clear rowDescrs ;
clear colDescrs ;
for i = 1:length(row)
data = load(conf.gbPaths{row(i)}) ;
rowDescrs{i} = data.descrs ;
end
for j = 1:length(col)
if ~isempty(conf.gbTestPaths)
data = load(conf.gbTestPaths{col(j)}) ;
else
data = load(conf.gbPaths{col(j)}) ;
end
colDescrs{j} = data.descrs ;
end
% Compute distance
tic
if 1
block.matrix = feval(conf.distFn, rowDescrs, colDescrs) ;
else
block.matrix = zeros(length(row), length(col)) ;
for i = 1:length(row)
for j = 1:length(col)
da = rowDescrs{i} ;
db = colDescrs{j} ;
block.matrix(i,j) = feval(conf.distFn,da,db) ;
end
fprintf('%5.2f %%: %5.1fm remaining.\n', ...
i/length(row)*100, ...
toc / i * (length(row)-i) / 60) ;
end
end
% Save block
ensuredir(fileparts(blockPath)) ;
fprintf('Saving block to ''%s''.\n', blockPath) ;
ssave(blockPath, '-STRUCT', 'block') ;
end
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