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## BART: Bayesian Additive Regression Trees
## Copyright (C) 2017-2018 Robert McCulloch and Rodney Sparapani
## mc.pwbart
## 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, a copy is available at
## https://www.R-project.org/Licenses/GPL-2
mc.pwbart = function(
x.test, #x matrix to predict at
treedraws, #$treedraws from wbart
mu=0, #mean to add on
mc.cores=2L,
transposed=FALSE,
dodraws=TRUE,
nice=19L
)
{
if(.Platform$OS.type!='unix')
stop('parallel::mcparallel/mccollect do not exist on windows')
if(!transposed) x.test <- t(bartModelMatrix(x.test))
p <- length(treedraws$cutpoints)
if(p!=nrow(x.test))
stop(paste0('The number of columns in x.test must be equal to ', p))
mc.cores.detected <- detectCores()
if(!is.na(mc.cores.detected) && mc.cores>mc.cores.detected) mc.cores <- mc.cores.detected
K <- ncol(x.test)
if(K<mc.cores) mc.cores=K
k <- K%/%mc.cores-1
j <- K
for(i in 1:mc.cores) {
if(i==mc.cores) h <- 1
else h <- j-k
##print(c(i=i, h=h, j=j))
parallel::mcparallel({psnice(value=nice);
pwbart(matrix(x.test[ , h:j], nrow=p, ncol=j-h+1), treedraws, mu, 1, TRUE)},
silent=(i!=1))
j <- h-1
}
## K <- ncol(x.test)
## k <- ceiling(K/mc.cores)
## h <- K-k
## parallel::mcparallel({psnice(value=nice);
## pwbart(trees, x.test[ , max(1, h):K], mu, 1, TRUE)})
## if(mc.cores>1) for(i in 1:(mc.cores-1)) {
## parallel::mcparallel({psnice(value=nice);
## pwbart(trees, x.test[ , max(1, (h-k)):(h-1)], mu, 1, TRUE)},
## silent=TRUE)
## h <- h-k
## }
pred.list <- parallel::mccollect()
pred <- pred.list[[1]]
type=class(pred)[1]
if(type=='list') pred <- pred[[1]]
else if(type!='matrix') return(pred.list) ## likely error messages
if(mc.cores>1) for(i in 2:mc.cores) {
if(type=='list') pred <- cbind(pred, pred.list[[i]][[1]])
else pred <- cbind(pred, pred.list[[i]])
}
##if(mc.cores>1) for(i in 2:mc.cores) pred <- cbind(pred, pred.list[[i]])
if(dodraws) return(pred)
else return(apply(pred, 2, mean))
## if(dodraws) return(pred+mu)
## else return(apply(pred, 2, mean)+mu)
}
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