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## BART: Bayesian Additive Regression Trees
## Copyright (C) 2018 Robert McCulloch and Rodney Sparapani
## 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.crisk2.bart <- function(
x.train = matrix(0,0,0), y.train=NULL,
x.train2 = x.train, y.train2=NULL,
times=NULL, delta=NULL, K=NULL,
x.test = matrix(0,0,0), x.test2 = x.test,
sparse=FALSE, theta=0, omega=1,
a=0.5, b=1, augment=FALSE, rho=NULL, rho2=NULL,
xinfo=matrix(0,0,0), xinfo2=matrix(0,0,0), usequants=FALSE,
##cont=FALSE,
rm.const=TRUE, type='pbart',
ntype=as.integer(
factor(type, levels=c('wbart', 'pbart', 'lbart'))),
k = 2, ## BEWARE: do NOT use k for other purposes below
power = 2, base = 0.95,
offset = NULL, offset2 = NULL,
tau.num=c(NA, 3, 6)[ntype],
##binaryOffset = NULL, binaryOffset2 = NULL,
ntree = 50L, numcut = 100L,
ndpost = 1000L, nskip = 250L,
keepevery = 10L,
##nkeeptrain=ndpost, nkeeptest=ndpost,
##nkeeptestmean=ndpost,
##nkeeptreedraws=ndpost,
printevery=100L,
##treesaslists=FALSE,
##keeptrainfits=TRUE,
id=NULL, ## crisk2.bart only
seed = 99L, mc.cores = 2L, nice=19L
)
{
if(.Platform$OS.type!='unix')
stop('parallel::mcparallel/mccollect do not exist on windows')
RNGkind("L'Ecuyer-CMRG")
set.seed(seed)
parallel::mc.reset.stream()
if(is.na(ntype) || ntype==1)
stop("type argument must be set to either 'pbart' or 'lbart'")
x.train2 <- bartModelMatrix(x.train2)
x.test2 <- bartModelMatrix(x.test2)
x.train <- bartModelMatrix(x.train)
x.test <- bartModelMatrix(x.test)
if(length(y.train)==0) {
pre <- surv.pre.bart(times, delta, x.train, x.test, K=K)
pre2 <- surv.pre.bart(times, delta, x.train2, x.test2, K=K)
y.train <- pre$y.train
x.train <- pre$tx.train
x.test <- pre$tx.test
y.train2 <- 1*(y.train[y.train>0]==1)
x.train2 <- cbind(pre2$tx.train[y.train>0, ])
x.test2 <- pre2$tx.test
y.train <- 1*(y.train>0)
times <- pre$times
K <- pre$K
}
else {
if(length(x.train)==0 | length(x.train2)==0)
stop('both x.train and x.train2 must be provided')
## if(nrow(x.train)!=nrow(x.train2))
## stop('number of rows in x.train and x.train2 must be equal')
times <- unique(sort(x.train[ , 1]))
K <- length(times)
}
H <- 1
Mx <- 2^31-1
Nx <- 2*max(nrow(x.train), nrow(x.test))
if(Nx>Mx%/%ndpost) {
H <- ceiling(ndpost / (Mx %/% Nx))
ndpost <- ndpost %/% H
##nrow*ndpost>2Gi: due to the 2Gi limit in sendMaster
##(unless this limit was increased): reducing ndpost
}
mc.cores.detected <- detectCores()
if(mc.cores>mc.cores.detected) {
message('The number of cores requested, ', mc.cores,
',\n exceeds the number of cores detected via detectCores() ',
'reducing to ', mc.cores.detected)
mc.cores <- mc.cores.detected
}
mc.ndpost <- ceiling(ndpost/mc.cores)
post.list <- list()
for(h in 1:H) {
for(i in 1:mc.cores) {
parallel::mcparallel({psnice(value=nice);
crisk2.bart(x.train=x.train, y.train=y.train,
x.train2=x.train2, y.train2=y.train2,
x.test=x.test, x.test2=x.test2,
sparse=sparse, theta=theta, omega=omega,
a=a, b=b, augment=augment,
rho=rho, rho2=rho2,
xinfo=xinfo, xinfo2=xinfo2, usequants=usequants,
##cont=cont,
rm.const=rm.const, type=type,
k=k, power=power, base=base,
offset=offset, offset2=offset2, tau.num=tau.num,
##binaryOffset=binaryOffset,
##binaryOffset2=binaryOffset2,
ntree=ntree, numcut=numcut,
ndpost=mc.ndpost, nskip=nskip,
keepevery = keepevery,
##nkeeptrain=mc.ndpost, nkeeptest=mc.ndpost,
##nkeeptreedraws=mc.ndpost,
printevery=printevery)},
##keeptrainfits=TRUE)},
silent=(i!=1))
## to avoid duplication of output
## capture stdout from first posterior only
}
post.list[[h]] <- parallel::mccollect()
}
if((H==1 & mc.cores==1) |
attr(post.list[[1]][[1]], 'class')!='crisk2bart')
return(post.list[[1]][[1]])
else {
for(h in 1:H) for(i in mc.cores:1) {
if(h==1 & i==mc.cores) {
post <- post.list[[1]][[mc.cores]]
post$ndpost <- H*mc.cores*mc.ndpost
p <- ncol(x.train[ , post$rm.const])
old.text <- paste0(as.character(mc.ndpost), ' ',
as.character(ntree), ' ', as.character(p))
old.stop <- nchar(old.text)
post$treedraws$trees <- sub(old.text,
paste0(as.character(post$ndpost),
' ', as.character(ntree),
' ', as.character(p)),
post$treedraws$trees)
p <- ncol(x.train2[ , post$rm.const2])
old.text <- paste0(as.character(mc.ndpost), ' ',
as.character(ntree), ' ', as.character(p))
old.stop2 <- nchar(old.text)
post$treedraws2$trees <- sub(old.text,
paste0(as.character(post$ndpost),
' ', as.character(ntree),
' ', as.character(p)),
post$treedraws2$trees)
}
else {
if(length(x.test)>0) {
post$yhat.test <- rbind(post$yhat.test,
post.list[[h]][[i]]$yhat.test)
post$yhat.test2 <- rbind(post$yhat.test2,
post.list[[h]][[i]]$yhat.test2)
post$prob.test <- rbind(post$prob.test,
post.list[[h]][[i]]$prob.test)
post$prob.test2 <- rbind(post$prob.test2,
post.list[[h]][[i]]$prob.test2)
post$cif.test <- rbind(post$cif.test,
post.list[[h]][[i]]$cif.test)
post$cif.test2 <- rbind(post$cif.test2,
post.list[[h]][[i]]$cif.test2)
post$surv.test <- rbind(post$surv.test,
post.list[[h]][[i]]$surv.test)
}
post$varcount <- rbind(post$varcount,
post.list[[h]][[i]]$varcount)
post$varcount2 <- rbind(post$varcount2,
post.list[[h]][[i]]$varcount2)
post$varprob <- rbind(post$varprob,
post.list[[h]][[i]]$varprob)
post$varprob2 <- rbind(post$varprob2,
post.list[[h]][[i]]$varprob2)
post$treedraws$trees <- paste0(post$treedraws$trees,
substr(post.list[[h]][[i]]$treedraws$trees, old.stop+2,
nchar(post.list[[h]][[i]]$treedraws$trees)))
post$treedraws2$trees <- paste0(post$treedraws2$trees,
substr(post.list[[h]][[i]]$treedraws2$trees, old.stop2+2,
nchar(post.list[[h]][[i]]$treedraws2$trees)))
}
post.list[[h]][[i]] <- NULL
}
if(length(x.test)>0) {
post$prob.test.mean <- apply(post$prob.test, 2, mean)
post$prob.test2.mean <- apply(post$prob.test2, 2, mean)
post$cif.test.mean <- apply(post$cif.test, 2, mean)
post$cif.test2.mean <- apply(post$cif.test2, 2, mean)
post$surv.test.mean <- apply(post$surv.test, 2, mean)
}
post$varcount.mean <- apply(post$varcount, 2, mean)
post$varcount2.mean <- apply(post$varcount2, 2, mean)
post$varprob.mean <- apply(post$varprob, 2, mean)
post$varprob2.mean <- apply(post$varprob2, 2, mean)
attr(post, 'class') <- 'crisk2bart'
return(post)
}
}
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