# Copyright (C) 2006, 2007 Michael Creel <michael.creel@uab.es> # under the terms of the GNU General Public License. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; If not, see <http://www.gnu.org/licenses/>. # kernel_regression_nodes: for internal use by kernel_regression - does calculations on nodes function z = kernel_regression_nodes(eval_points, data, do_cv, kernel, points_per_node, nslaves, debug) if (nslaves > 0) global NEWORLD [info, myrank] = MPI_Comm_rank(NEWORLD); else myrank = 0; # if not parallel then do all on master node endif if myrank == 0 # Do this if I'm master startblock = nslaves*points_per_node + 1; endblock = rows(eval_points); else # this is for the slaves startblock = myrank*points_per_node - points_per_node + 1; endblock = myrank*points_per_node; endif # the block of eval_points this node does myeval = eval_points(startblock:endblock,:); nn = rows(myeval); n = rows(data); y = data(:,1); data = data(:,2:columns(data)); W = __kernel_weights(data, myeval, kernel); # drop own weight for CV if (do_cv) W = W - diag(diag(W)); endif den = sum(W,2); if !all(den) warning("kernel_regression: some evaluation points have no neighbors - increase the bandwidth"); den = den + eps; # avoid divide by zero endif W = W ./ (repmat(den,1,n)); z = W*y; if debug printf("z on node %d: \n", myrank); z' endif endfunction

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