Nothing
Sparse regression with paired covariates
In palasso: Paired Lasso Regression
title: Sparse regression with paired covariates
header-includes: \usepackage{amsmath} \usepackage{xcolor} \usepackage{caption}\captionsetup[figure]{labelformat=empty}
\usepackage[section]{placeins} \definecolor{blue}{HTML}{0000CD} \definecolor{red}{HTML}{CD0000}
output: rmarkdown::html_vignette
vignette: >
%\VignetteIndexEntry{script}
%\VignetteEncoding{UTF-8}
%\VignetteEngine{knitr::rmarkdown}
editor_options:
chunk_output_type: console
Code for reproducing the results shown in the manuscript.
# Set eval to TRUE to create Figures.
# Set echo to TRUE for html, but to FALSE for pdf.
knitr::opts_chunk$set(eval=FALSE,echo=TRUE,fig.path="images/")
eval <- FALSE # TRUE or FALSE
Initialisation
### Loading functions. ###
inst <- rownames(utils::installed.packages())
cran <- c("devtools","R.utils","Matrix","glmnet","pROC","BiocManager","ashr")
# "googledrive", "httpuv"
if(!all(cran %in% inst)){
for(i in seq_along(cran)){
if(!cran[i] %in% inst){
install.packages(cran[i])
}
}
}
bioc <- c("edgeR","TCGAbiolinks")
if(!all(bioc %in% inst)){
#source("http://bioconductor.org/biocLite.R")
for(i in seq_along(bioc)){
if(!bioc[i] %in% inst){
#biocLite(bioc[i])
BiocManager::install(bioc[i])
}
}
}
#if(!"ashr" %in% inst){
# devtools::install_github("stephens999/ashr")
#}
user <- Sys.getenv("USERNAME")
path <- file.path("C:","Users",user,"Desktop","palasso")
if(user=="arra"){path <- "C:/Users/arra/Desktop/MATHS/palasso_desktop"}
if(user==""){path <- "/virdir/Scratch/arauschenberger/palasso"}
setwd(path)
folders <- c("data","results")
invisible(sapply(folders,function(x) if(!dir.exists(x)){dir.create(x)}))
if(user!="arra"){
devtools::install_github("kkdey/CorShrink") # ref="a9f6ba0"
devtools::install_github("rauschenberger/palasso") # ref="4a995a2"
}
if(FALSE){
# The functions <<save>>, <<file.exists>> and <<file.remove>> access the hard disk, but also try to access googledrive.
save <- function(object,file){
base::save(object,file=file)
tryCatch(expr=googledrive::drive_upload(media=file,path=file),
error=function(x) NULL)
#Sys.sleep(0.5)
}
file.exists <- function(file){
offline <- base::file.exists(file)
online <- FALSE
if(!offline){
d <- googledrive::as_dribble(x=file)
online <- tryCatch(expr=googledrive::some_files(d),
error=function(x) FALSE)
#Sys.sleep(0.5)
}
return(offline|online)
}
file.remove <- function(file){
base::file.remove(file)
tryCatch(expr=googledrive::drive_trash(file=file),
error=function(x) NULL)
#Sys.sleep(0.5)
}
# The function <<update>> moves files from the research cloud to the remote drive. Given both paths, it first verifies whether the folders SIM, GDC and CCA are available, and then copies all missing files from the research cloud to the remote drive.
# from: path to the origin
# to: path to the destination
update <- function(from,to){
dir <- c("SIM","GDC","CCA")
if(any(!dir.exists(file.path(from,dir)))){stop("Invalid.")}
if(any(!dir.exists(file.path(to,dir)))){stop("Invalid.")}
pb <- utils::txtProgressBar(min=0,max=1,style=3)
for(i in seq_along(dir)){
files0 <- dir(file.path(from,dir[i]))
files1 <- dir(file.path(to,dir[i]))
names <- files0[!files0 %in% files1]
for(j in seq_along(names)){
utils::setTxtProgressBar(pb=pb,value=(i-1)/3+(j*i)/(3*length(names)))
file.copy(from=file.path(from,dir[i],names[j]),
to=file.path(to,dir[i],names[j]),
copy.date=TRUE)
}
utils::setTxtProgressBar(pb=pb,value=i/3)
}
}
# update(from="results",to="//tsclient/N/palasso/results")
}
Preparation
Last data download started on 2019-03-26 (R version 3.5.3).
### Downloading "Isoform Expression Quantification". ###
#rm(list=ls())
#<<functions>>
directory <- file.path(path,"data")
setwd(directory)
# Retrieving cancer types:
project <- TCGAbiolinks::getGDCprojects()$id
project <- project[grepl(x=project,pattern="TCGA")]
# Downloading isoform expression data:
y <- X <- list()
for(i in seq_along(project)){
query <- TCGAbiolinks::GDCquery(project=project[i],
data.category="Transcriptome Profiling",
data.type="Isoform Expression Quantification")
TCGAbiolinks::GDCdownload(query,method="api",directory=directory)
trace(TCGAbiolinks:::readTranscriptomeProfiling,tracer=quote(ignore.case<-TRUE))
X[[i]] <- TCGAbiolinks::GDCprepare(query,directory=directory)
X[[i]][,c("miRNA_ID","reads_per_million_miRNA_mapped",
"cross-mapped","miRNA_region")] <- NULL
y[[i]] <- rep(project[i],times=length(unique(X[[i]]$barcode)))
}
save(list=c("y","X"),file=file.path(path,"data","isoform_raw.RData"))
load(file.path(path,"data","isoform_raw.RData"),verbose=TRUE)
# Merging isoform expression data:
Xs <- do.call(what=rbind,args=X) # sparse matrix
y <- do.call(what="c",args=y)
# Transform to matrix
Xs$isoform_coords <- gsub(pattern="hg38:chr",replacement="",x=Xs$isoform_coords)
samples <- unique(Xs$barcode)
covariates <- unique(Xs$isoform_coords)
row <- match(Xs$barcode,samples)
col <- match(Xs$isoform_coords,covariates)
X <- Matrix::sparseMatrix(i=row,j=col,x=Xs$read_count,dimnames=list(samples,covariates))
# Order by molecular location
split <- strsplit(x=colnames(X),split=":|-")
chr <- sapply(split,function(x) x[[1]])
pos <- sapply(split,function(x) x[[2]])
order <- order(chr,pos)
X <- X[,order]
if(FALSE){ # testing
i <- sample(seq_len(nrow(Xs)),size=1)
Xs$read_count[i]
X[Xs$barcode[i],Xs$isoform_coords[i]]
}
save(list=c("y","X"),file=file.path(path,"data","isoform_all.RData"))
### Downloading "miRNA Expression Quantification". ###
#rm(list=ls())
#<<functions>>
directory <- file.path(path,"data")
setwd(directory)
# Downloading data.
project <- TCGAbiolinks::getGDCprojects()$id
project <- project[grepl(x=project,pattern="TCGA")]
y <- X <- list()
for(i in seq_along(project)){
query <- TCGAbiolinks::GDCquery(project=project[i],
data.category="Transcriptome Profiling",
data.type="miRNA Expression Quantification")
TCGAbiolinks::GDCdownload(query,method="api",directory=directory)
trace(TCGAbiolinks:::readTranscriptomeProfiling,tracer=quote(ignore.case<-TRUE))
data <- TCGAbiolinks::GDCprepare(query,directory=directory)
X[[i]] <- t(data[,c(seq(from=2,to=ncol(data),by=3))])
y[[i]] <- rep(project[i],times=nrow(X[[i]]))
}
save(list=c("y","X"),file=file.path(path,"data","miRNA_raw.RData"))
load(file.path(path,"data","miRNA_raw.RData"))
X <- do.call(what=rbind,args=X)
y <- do.call(what="c",args=y)
rownames(X) <- gsub(pattern="read_count_",replacement="",x=rownames(X))
save(list=c("y","X"),file=file.path(path,"data","miRNA_all.RData"))
### Downloading "Gene Expression Quantification". ###
#rm(list=ls())
#<<functions>>
directory <- file.path(path,"data")
setwd(directory)
# Retrieving cancer types:
project <- TCGAbiolinks::getGDCprojects()$id
project <- project[grepl(x=project,pattern="TCGA")]
# Downloading data:
memory.limit(size=16000) # Activate virtual memory in system control!
y <- X <- list()
for(i in seq_along(project)){
query <- TCGAbiolinks::GDCquery(project=project[i],
data.category="Transcriptome Profiling",
data.type="Gene Expression Quantification",
workflow.type="HTSeq - Counts"); gc()
TCGAbiolinks::GDCdownload(query=query,method="api",directory=directory); gc()
trace(TCGAbiolinks:::readTranscriptomeProfiling,tracer=quote(ignore.case<-TRUE)); gc()
X[[i]] <- TCGAbiolinks::GDCprepare(query,directory=directory); gc()
y[[i]] <- rep(project[i],times=ncol(X[[i]])); gc()
}
save(list=c("y","X"),file=file.path(path,"data","gene_raw.RData"))
load(file.path(path,"data","gene_raw.RData"))
genes <- SummarizedExperiment::rowData(X[[1]])
mart <- biomaRt::useMart("ensembl",dataset="hsapiens_gene_ensembl") #
char <- biomaRt::getBM(attributes=c("ensembl_gene_id","chromosome_name","transcript_start","gene_biotype"),filters=c("biotype","chromosome_name"),values=list("protein_coding",c(1:22,"X")),mart=mart)
select <- genes$ensembl_gene_id[genes$ensembl_gene_id %in% char$ensembl_gene_id]
X <- lapply(X,function(x) t(SummarizedExperiment::assays(x)$"HTSeq - Counts"[select,]))
X <- do.call(what=rbind,args=X)
y <- do.call(what="c",args=y)
save(list=c("y","X"),file=file.path(path,"data","gene_all.RData"))
### Downloading "Copy Number Variation". ###
#rm(list=ls())
#<<functions>>
directory <- file.path(path,"data")
setwd(directory)
project <- TCGAbiolinks::getGDCprojects()$id
project <- project[grepl(x=project,pattern="TCGA")]
y <- X <- list()
for(i in seq_along(project)){
query <- TCGAbiolinks::GDCquery(project=project[i],
data.category="Copy Number Variation",
data.type="Masked Copy Number Segment")
TCGAbiolinks::GDCdownload(query=query,method="api",directory=directory)
trace(TCGAbiolinks:::readTranscriptomeProfiling,tracer=quote(ignore.case<-TRUE))
X[[i]] <- TCGAbiolinks::GDCprepare(query,directory=directory)
y[[i]] <- rep(project[i],times=length(unique(X[[i]]$Sample))) # correct?
}
save(list=c("y","X"),file=file.path(path,"data","CNV_raw.RData"))
load(file.path(path,"data","CNV_raw.RData"),verbose=TRUE)
# Merging CNV data:
Xs <- do.call(what=rbind,args=X) # sparse matrix
y <- do.call(what="c",args=y)
#table(Xs$Sample)
# Prepare cutting.
cut <- list()
cut$chr <- c(1:22,"X")
cut$start <- sapply(cut$chr,function(x) min(Xs$Start[Xs$Chromosome==x]))
cut$end <- sapply(cut$chr,function(x) max(Xs$End[Xs$Chromosome==x]))
cut$length <- cut$end-cut$start
cut$dist <- sum(cut$length)/10000
cut$num <- round(cut$length/cut$dist)
# Create covariates.
cov <- list()
cov$p <- sum(cut$num)
cov$chromosome <- unlist(sapply(cut$chr,function(i) rep(i,times=cut$num[i])))
cov$location <- unlist(sapply(cut$chr,function(i) round(seq(from=cut$start[i],to=cut$end[i],length.out=cut$num[i]))))
cov$name <- paste0(cov$chromosome,":",cov$location)
# Create indices for each covariate.
index <- rep(list(integer()),times=cov$p)
pb <- utils::txtProgressBar(min=0,max=cov$p,style=3)
for(j in seq_len(cov$p)){
utils::setTxtProgressBar(pb=pb,value=j)
index[[j]] <- which((Xs$Chromosome==cov$chromosome[j]) &
(Xs$Start<=cov$location[j]) & (cov$location[j]<=Xs$End)) # consider <
}
# Expand indices to matrix.
X <- matrix(0,nrow=length(unique(Xs$Sample)),ncol=cov$p,
dimnames=list(unique(Xs$Sample),cov$name))
for(j in seq_along(index)){
mean <- Xs$Segment_Mean[index[[j]]]
i <- Xs$Sample[index[[j]]]
X[i,j] <- mean
}
if(FALSE){ # test
sample <- sample(rownames(X),size=1)
covariate <- sample(colnames(X),size=1)
split <- strsplit(covariate,split=":")[[1]]
a <- X[sample,covariate]
b <- Xs$Segment_Mean[(Xs$Sample==sample) & (Xs$Chromosome==split[1]) & (Xs$Start<=as.numeric(split[2])) & (as.numeric(split[2]) < Xs$End)]
all(a==b)
}
save(list=c("y","X","index"),file=file.path(path,"data","CNV_all.RData"))
### Extracting samples of interest. ###
#rm(list=ls())
#<<functions>>
type <- c("isoform","miRNA","CNV","gene")
for(i in seq_along(type)){
cat(type[i],"\n")
load(file.path(path,"data",paste0(type[i],"_all.RData")),verbose=TRUE)
# TCGA barcode
barcode <- rownames(X)
code <- sapply(barcode,function(x) strsplit(x,split="-"))
code <- as.data.frame(do.call(what=rbind,args=code))
colnames(code) <- c("project","TSS","participant","sample_vial",
"portion_analyte","plate","center")
code$sample <- substr(code$sample_vial,start=1,stop=2)
code$vial <- substr(code$sample_vial,start=3,stop=3)
code$portion <- substr(code$portion_analyte,start=1,stop=2)
code$analyte <- substr(code$portion_analyte,start=3,stop=3)
code$sample_vial <- code$portion_analyte <- NULL
# solid tumour (except blood for LAML)
solid <- (code$sample=="01" | (y=="TCGA-LAML" & code$sample=="03"))
X <- X[solid,]
y <- y[solid]
# unique samples
unique <- !duplicated(substr(rownames(X),start=1,stop=12))
X <- X[unique,]
y <- y[unique]
save(list=c("y","X"),file=file.path(path,"data",paste0(type[i],"_sub.RData")))
}
# isoform: n=9'794, p=194'595, k=32
# miRNA: n=9'794, p=1'881, k=32
# gene: n=9'830, p=19'602, k=33
# CNV: n=10'578, p=10'000, k=33
## Understanding barcodes:
# overview: https://wiki.nci.nih.gov/display/TCGA/TCGA+barcode
# details: https://gdc.cancer.gov/resources-tcga-users/tcga-code-tables
## Understanding replicate samples:
# http://gdac.broadinstitute.org/runs/sampleReports/latest/READ_Replicate_Samples.html
Analysis
Last data analysis started on 2019-04-12 (R version 3.5.3).
### Analysing the TCGA data. ###
#rm(list=ls())
#<<functions>>
for(type in c("miRNA","isoform","CNV","gene")){
library(Matrix)
for(k in c(207,sample(528))){
set.seed(k); cat(k," ")
if(type %in% c("isoform","miRNA") & k > 496){next}
if(type %in% c("CNV","gene") & k > 528){next}
# searching for missing cancer-cancer combinations
rm(list=setdiff(ls(),c("k","type","path","save","file.exists","file.remove"))); gc()
file0 <- paste0("results/",type,"_start_",k,".RData")
file1 <- paste0("results/",type,"_loss_",k,".RData")
if(file.exists(file0)||file.exists(file1)){next}
save(object=k,file=file0)
load(paste0("data/",type,"_sub.RData"))
# indicating the cancer-cancer combination
cancer <- substring(text=unique(y),first=6)
comb <- utils::combn(x=cancer,m=2)
select <- paste0("TCGA-",comb[,k])
y <- ifelse(y==select[1],1,ifelse(y==select[2],0,NA))
rm(cancer,select)
# removing other cancer types
cond <- !is.na(y)
y <- y[cond]
X <- X[cond,]
rm(cond)
# pre-processing
if(type %in% c("isoform","miRNA")){
x <- palasso:::.prepare(X,cutoff="zero")
} else if(type=="gene"){
x <- palasso:::.prepare(X,cutoff="knee")
} else if(type=="CNV"){
x <- list(X=X,Z=sign(X))
x <- lapply(x,function(x) scale(x))
attributes(x)$info <- data.frame(n=nrow(X),p=ncol(X),prop=mean(x$Z==0))
}
rm(X)
# cross-validation
loss <- tryCatch(expr=palasso:::.predict(y=y,X=x,nfolds.int=10),error=function(e) palasso:::.predict(y=y,X=x,nfolds.int=10))
# information
loss$info <- cbind(k=k,
y0=comb[2,k],
y1=comb[1,k],
n0=sum(y==0),
n1=sum(y==1),
attributes(x)$info,
loss$info)
# refit
object <- palasso::palasso(y=y,X=x,nfolds=10,family="binomial",standard=TRUE,elastic=TRUE,shrink=TRUE)
model <- c(names(object),"elastic",
paste0("paired.",c("adaptive","standard","combined")))
for(max in c(10,50,Inf)){
temp <- list()
temp$nzero <- data.frame(model=model,x=NA,z=NA)
for(i in seq_along(model)){
coef <- palasso:::coef.palasso(object=object,model=model[i],max=max)
temp$nzero$x[i] <- sum(coef$x!=0)
temp$nzero$z[i] <- sum(coef$z!=0)
}
temp$select <- palasso:::subset.palasso(x=object,max=max,
model="paired.adaptive")$palasso$select
temp$weights <- palasso:::weights.palasso(object=object,max=max,
model="paired.adaptive")
temp$coef <- palasso:::coef.palasso(object=object,max=max,
model="paired.adaptive")
loss[[paste0("fit",max)]] <- temp
}
save(object=loss,file=file1)
file.remove(file0)
}
index <- sum(grepl(dir(),pattern="sessionInfo"))
sink(paste0("sessionInfo",index+1,".txt"))
date()
utils::sessionInfo()
devtools::session_info()
sink()
}
# The function <<collect>> loads all files from PATH including PATTERN in the file name, loads OBJECT into a list, and executes a function call.
#<<functions>>
# path: folder
# pattern: character, or NULL (all files)
# object: character vector, or NULL (all objects)
# what: function call
collect <- function(path=getwd(),pattern="",object=NULL,what="rbind"){
OBJECT = object
# identify files
files <- dir(path)
files <- files[grepl(x=files,pattern=pattern)]
files <- files[grepl(x=files,pattern=".RData")]
number <- gsub(pattern=paste0(pattern,"|.RData"),replacement="",x=files)
files <- files[order(as.numeric(number))] # trial1
names <- gsub(pattern=".RData",replacement="",x=files) # trial1
if(length(files)==0){stop("Invalid datasets.")}
# load data
all <- list()
for(i in seq_along(files)){
x <- load(file.path(path,files[i]))
x <- eval(parse(text=x))
if(is.null(OBJECT)){
all[[i]] <- x
names(all)[i] <- names[i]
} else {
for(j in seq_along(OBJECT)){
all[[OBJECT[j]]][[i]] <- x[[OBJECT[j]]]
names(all[[OBJECT[j]]])[i] <- names[i]
}
}
}
# fuse data
if(is.null(OBJECT)){
all <- do.call(what=what,args=all)
} else {
all <- lapply(all,function(x) do.call(what=what,args=x))
}
return(all)
}
LOSS <- list()
type <- c("gene","isoform","miRNA","CNV")
#type <- "miRNA"
for(i in seq_along(type)){
LOSS[[type[i]]] <- collect(path="results",
pattern=paste0(type[i],"_loss_"),
object=c("deviance","auc","class","info",
paste0("fit",c(10,50,Inf))))
}
for(i in seq_along(LOSS)){
for(j in 1:3){
colnames(LOSS[[i]][[j]])[colnames(LOSS[[i]][[j]])=="paired.adaptive"] <- "paired"
}
}
#type <- "gene"
#a <- LOSS[[type]]$deviance[rownames(LOSS[[type]]$deviance)=="10","paired"]
#b <- LOSS[[type]]$deviance[rownames(LOSS[[type]]$deviance)=="10","elastic"]
#mean(a<b)
### Testing for significant differences. ###
#rm(list=ls())
#<<functions>>
#<<collect>>
row <- c("gene","isoform","miRNA","CNV")
col <- c("10","Inf")
lay <- c("standard_x","standard_z","standard_xz",
"adaptive_x","adaptive_z","adaptive_xz",
"elastic") # added "elastic"
M <- array(NA,dim=c(length(row),length(col),length(lay)),dimnames=list(row,col,lay))
for(i in seq_along(row)){
loss <- LOSS[[row[i]]][c("info","deviance")]
y0 <- as.character(loss$info$y0)
y1 <- as.character(loss$info$y1)
cancer <- sort(unique(c(y0,y1)))
Z <- palasso:::.design(x=cancer)
for(j in seq_along(col)){
# differences
cond <- rownames(loss$deviance)==col[j]
for(k in seq_along(lay)){
fill <- loss$deviance[cond,lay[k]] - loss$deviance[cond,"paired"]
X <- matrix(NA,nrow=length(cancer),ncol=length(cancer),
dimnames=list(cancer,cancer))
X[cbind(y0,y1)] <- X[cbind(y1,y0)] <- fill
X[lower.tri(X)] <- NA
# p-values
pvalue <- rep(NA,times=max(Z))
for(l in seq_len(max(Z))){
x <- as.numeric(X[Z==l])
if(col[j]=="10"){
alternative <- "greater" # Never use "two.sided"!
}
if(col[j]=="Inf"){
alternative <- "less" # Never use "two.sided"!
}
pvalue[l] <- stats::wilcox.test(x=x,alternative=alternative,
exact=FALSE)$p.value
}
# Simes
M[i,j,k] <- palasso:::.combine(pvalue,method="simes")
}
}
}
# Table SIG: significance
constraint <- "10"
table <- format(M[,constraint,1:6],digits=1,scientific=FALSE)
for(i in seq_len(nrow(table))){
for(j in seq_len(ncol(table))){
if(M[i,constraint,j]>=0.05){
table[i,j] <- paste0("{\\color{gray}{",table[i,j],"}}")
}
}
}
one <- c("","\\text{standard}","","","\\text{adaptive}","")
two <- paste0("\\text{",c("x","z","xz","x","z","xz"),"}")
rownames(table) <- paste0("\\text{",rownames(table),"}")
table <- rbind(one,two,table,deparse.level=0)
rownames(table)[1] <- "~"
xtable <- xtable::xtable(table,align=c("r","|","c","c","c","|","c","c","c"))
xtable::print.xtable(xtable,type="latex",include.colnames=FALSE,sanitize.text.function=identity)
### Comparison with elastic net. ###
#rm(list=ls())
#<<functions>>
#<<collect>>
row <- c("gene","isoform","miRNA","CNV")
col <- c("10","50","Inf")
better <- worse <- less <- matrix(NA,nrow=length(row),ncol=length(col),
dimnames=list(row,col))
for(i in seq_along(row)){
for(j in seq_along(col)){
# proportion of improvements (cross-validation)
cond <- rownames(LOSS[[row[i]]]$deviance)==col[j]
loss <- LOSS[[row[i]]]$deviance[cond,c("paired","elastic")]
better[i,j] <- round(mean(loss[,"paired"]<loss[,"elastic"]),digits=2)
worse[i,j] <- round(mean(loss[,"paired"]>loss[,"elastic"]),digits=2)
# average difference in nzero (refitted models)
df_paired <- apply(LOSS[[row[i]]][[paste0("fit",col[j])]],1,function(x) sum(x$nzero[x$nzero[,"model"]=="paired.adaptive",c("x","z")]))
df_elastic <- apply(LOSS[[row[i]]][[paste0("fit",col[j])]],1,function(x) sum(x$nzero[x$nzero[,"model"]=="elastic95",c("x","z")]))
df_diff <- df_elastic-df_paired
less[i,j] <- round(mean(df_diff),digits=2)
#graphics::hist(df_diff,main=paste(row[i],col[j]),xlim=c(-1,1)*max(abs(df_diff)))
}
}
better
worse
less
### Analysing the refitted models. ###
#rm(list=ls())
#<<functions>>
#<<collect>>
# Table SEL: selected model
nzero <- paste0("fit",c(5,10,Inf))
model <- c(paste0("standard_",c("x","z","xz")),
paste0("adaptive_",c("x","z","xz")),
"between_xz","within_xz")
type <- c("gene","isoform","miRNA","CNV")
table <- array(NA,dim=c(length(nzero),length(model),length(type)),
dimnames=list(nzero,model,type))
for(i in seq_along(nzero)){
for(j in seq_along(model)){
for(k in seq_along(type)){
sub <- LOSS[[type[k]]][[nzero[i]]]
table[i,j,k] <- sum(sub[,"select"]==model[j])
}
}
}
colSums(table["fit10",,]) # CHECK WHETHER COMPLETE!
table <- round(prop.table(table["fit10",,],margin=2),digits=2)
table <- t(table)
table <- table[,apply(table,2,function(x) any(x!=0))]
rownames(table) <- paste0("\\text{",rownames(table),"}")
xtable <- xtable::xtable(table,align=c("r","|","c","c","c","c"))
xtable::print.xtable(xtable,type="latex",include.colnames=FALSE,sanitize.text.function=identity)
# selected weights and covariates
type <- c("gene","isoform","miRNA","CNV")
group <- c("x","z")
model <- c(paste0("standard_",c("x","z","xz")),
paste0("adaptive_",c("x","z","xz")),
"paired.adaptive","elastic") # added "elastic" , paste0("elastic",c(100,75,50,25))
weights10 <- weightsInf <- matrix(NA,nrow=length(group),ncol=length(type),
dimnames=list(group,type))
coef10 <- coefInf <- array(NA,dim=c(length(group),length(type),length(model)),
dimnames=list(group,type,model))
for(i in seq_along(group)){
for(j in seq_along(type)){
weights10[,j] <- rowMeans(sapply(LOSS[[type[j]]]$fit10[,"weights"],colMeans))
weightsInf[,j] <- rowMeans(sapply(LOSS[[type[j]]]$fitInf[,"weights"],colMeans))
for(k in seq_along(model)){
coef10[i,j,k] <- mean(sapply(LOSS[[type[j]]]$fit10[,"nzero"], function(x) sum(x[x$model==model[k],group[i]])))
coefInf[i,j,k] <- mean(sapply(LOSS[[type[j]]]$fitInf[,"nzero"], function(x) sum(x[x$model==model[k],group[i]])))
}
}
}
# coef10["x",,]+coef10["z",,]
# with sparsity constraint
round(prop.table(weights10,margin=2),2)
round(prop.table(coef10[,,"paired.adaptive"],margin=2),2)
round(colSums(coef10[,,"paired.adaptive"]),2)
# natural sparsity
round(prop.table(weightsInf,margin=2),2)
round(prop.table(coefInf[,,"paired.adaptive"],margin=2),2)
round(colSums(coefInf[,,"paired.adaptive"]),2)
round(colSums(coefInf[,,"elastic"])/colSums(coefInf[,,"paired.adaptive"]),1) # multiple nzero of elastic net and paired lasso
# Table NSC: number of non-zero coefficients
table <- round(coefInf["x",,]+coefInf["z",,])
colnames(table)[7] <- "paired"
one <- c("","\\text{standard}","","","\\text{adaptive}","","\\text{paired}","\\text{elastic}")
two <- paste0("\\text{",c("x","z","xz","x","z","xz","xz","xz"),"}")
rownames(table) <- paste0("\\text{",rownames(table),"}")
table <- rbind(one,two,table,deparse.level=0)
rownames(table)[1] <- "~"
xtable <- xtable::xtable(table,align=c("r","|","c","c","c","|","c","c","c","|","c","|","c"))
xtable::print.xtable(xtable,type="latex",include.colnames=FALSE,sanitize.text.function=identity)
Figures
### FIGURE CSW ###
#rm(list=ls())
#<<functions>>
set.seed(1)
overfit <- TRUE
# simulate
n <- 10
cx <- stats::rbeta(n=n,shape1=0.9,shape2=1)
cz <- stats::rbeta(n=n,shape1=0.4,shape2=0.9)
# collection
x <- list()
y <- list()
# adaptive weights (X only)
x[[1]] <- rep(1,times=n)
if(overfit){x[[1]] <- cx}
y[[1]] <- rep(0,times=n)
# adaptive weights (Z only)
x[[2]] <- rep(0,times=n)
y[[2]] <- rep(1,times=n)
if(overfit){y[[2]] <- cz}
# adaptive weights (X and Z)
x[[3]] <- y[[3]] <- rep(0.5,times=n)
if(overfit){x[[3]] <- cx}
if(overfit){y[[3]] <- cz}
# within-pair weights
x[[4]] <- cx^2/(cx+cz)
y[[4]] <- cz^2/(cx+cz)
# visualisation
graphics::par(mfrow=c(1,4),mar=c(4.5,0.5,0.5,0.5),oma=c(0,2,0,0))
for(i in seq_len(4)){
palasso:::plot_pairs(x=x[[i]],y=y[[i]],lwd=4)
if(i==1){
graphics::mtext(text="covariate pair",side=2,line=1)
}
}
```r provides suitable isomi\textsc{r} data for $9\,794$ samples (left), from $32$ cancer types (centre), forming $496$ cancer-cancer combinations (right). Each sample appears in $31$ combinations."}
FIGURE DIA
rm(list=ls())
<>
ellipse <- function(x,y,a=0.2,b=0.25,border=NA){
n <- max(c(length(x),length(y)))
if(length(x)==1){x <- rep(x,times=n)}
if(length(y)==1){y <- rep(y,times=n)}
if(length(border)==1){border <- rep(border,times=n)}
for(i in seq_len(n)){
angle <- seq(from=0,to=2*pi,length=100)
xs <- x[i] + a * cos(angle)
ys <- y[i] + b * sin(angle)
graphics::polygon(x=xs,y=ys,col=grey(0.9),border=border[i])
}
}
cancer <- c("ACC","BLCA","BRCA","UVM")
number <- c(80,409,1078,80)
col <- grDevices::rgb(red=0,green=0,blue=sample(seq(from=75,to=255,length.out=length(number))),maxColorValue=255)
lwd <- log(2number)-2
lwd = pmax(5number/max(number),1)
x1 <- 1.3; x2 <- 2; x3 <- 3
set.seed(1)
first layer (bubble)
graphics::plot.new()
graphics::par(mar=c(0,0,0,0))
graphics::plot.window(xlim=c(1.1,3.3),ylim=c(-1.6,1.6))
ellipse(x=x1,y=0)
graphics::text(x=x1,y=0,labels="TCGA",font=2,adj=c(0.5,0))
graphics::text(x=x1,y=0,labels="n=9794",adj=c(0.5,1.2),cex=0.9)
second layer (colon)
y1 <- seq(from=1,to=-1,length.out=length(cancer)+1)
graphics::text(x=x2,y=y1[length(cancer)],labels="...",font=2,srt=90)
y1 <- y1[-length(cancer)]
first-second layer (connect)
graphics::segments(x0=x1+0.2,y0=0,x1=x2-0.2,y1=y1,lwd=lwd,col=col)
second layer (bubble)
ellipse(x=x2,y=y1,a=0.2,b=0.2)
graphics::text(x=x2,y=y1,labels=cancer,font=2,col=col,adj=c(0.5,0))
graphics::text(x=x2,y=y1,labels=paste0("n=",number,""),adj=c(0.5,1.2),cex=0.9)
comb <- utils::combn(x=seq_along(y1),m=2)
third layer (colon)
y2 <- seq(from=1.5,to=-1.5,length.out=ncol(comb)+1)
graphics::text(x=x3,y=y2[ncol(comb)],labels="...",font=2,srt=90)
y2 <- y2[-ncol(comb)]
second-third layer (connect)
graphics::segments(x0=2.2,y0=y1[comb[1,]],x1=2.7,y1=y2,lwd=lwd[comb[1,]],col=col[comb[1,]])
graphics::segments(x0=2.2,y0=y1[comb[2,]],x1=2.7,y1=y2,lwd=lwd[comb[2,]],col=col[comb[2,]])
third layer (bubble)
ellipse(x=x3,y=y2,a=0.3,b=0.22)
graphics::text(x=x3,y=y2,labels=paste0(cancer[comb[1,]]," "),
font=2,col=col[comb[1,]],adj=c(1,0))
graphics::text(x=x3,y=y2,labels=paste0(" ",cancer[comb[2,]]),
font=2,col=col[comb[2,]],adj=c(0,0))
graphics::text(x=x3,y=y2,labels=":",font=2,adj=c(0.5,0))
labels <- apply(comb,2,function(x) sum(number[x]))
labels <- paste0("n=",labels,"")
graphics::text(x=x3,y=y2,labels=labels,adj=c(0.5,1.2),cex=0.9)
```rs, mi\\textsc{rna}s and \\textsc{cnv}s (from top to bottom). The bar charts (left) count how often the paired lasso leads to a lower (dark) or higher (bright) deviance than the competing model. The box plots (right) show how much lower (dark) or higher (bright) the deviance is."}
### FIGURE CLA ###
#rm(list=ls())
#<<functions>>
graphics::par(mfrow=c(4,2),oma=c(0,0,0,0),mar=c(2.1,3.5,0.5,0.5))
for(type in c("gene","isoform","miRNA","CNV")){
loss <- LOSS[[type]][c("deviance","auc","class")]
choice <- "paired"
loss <- lapply(loss,function(x) x[,c(paste0("standard_",c("x","z","xz")),paste0("adaptive_",c("x","z","xz")),choice)])
for(constraint in c("10")){ # c("5","10","Inf")
# change
sub <- lapply(loss,function(x) x[rownames(x)==constraint,])
palasso:::plot_score(sub$deviance,choice=choice)
change <- sub$deviance[,7]-sub$deviance[,-7]
palasso:::plot_box(change,ylab="change",zero=TRUE,choice=NA)
# info
info <- list()
info$select <- names(which.min(apply(sub$deviance,2,median)[-7]))
info$DEV_paired <- median(sub$deviance[,choice])
info$DEV_select <- median(sub$deviance[,info$select])
info$improve <- mean(sub$deviance[,info$select]>sub$deviance[,choice])
info$AUC_paired <- median(sub$auc[,choice])
info$CLASS_paired <- median(sub$class[,choice])
print(as.data.frame(info)) # important
}
}
```rs (top right), mi\textsc{rna}s (bottom left) and \textsc{cnv}s (bottom right). The median deviances ($y$-axis) of the standard (dotted), adaptive (dashed) and paired (solid) lasso converge as the sparsity constraint ($x$-axis) increases."}
FIGURE DEC
rm(list=ls())
<>
graphics::par(oma=c(1.0,1.0,0,0),mar=c(1.5,3.0,0.5,0.5),mfrow=c(1,1))
graphics::par(oma=c(1.0,1.0,0,0),mar=c(1.5,3.0,0.5,0.5),mfrow=c(2,2))
for(type in c("gene","isoform","miRNA","CNV")){
models <- c(paste0("standard_",c("x","z","xz")),
paste0("adaptive_",c("x","z","xz")),"paired")
constraint <- c("3","4","5","10","15","20","25","50","Inf")
loss <- LOSS[[type]]["deviance"]
loss <- lapply(loss,function(x) x[,models])
table <- matrix(NA,nrow=length(constraint),ncol=length(models),
dimnames=list(constraint,models))
for(i in seq_along(constraint)){
sub <- lapply(loss,function(x) x[rownames(x)==constraint[i],])
table[i,] <- apply(sub$deviance,2,median)
}
# table <- log(table)
graphics::plot.new()
graphics::plot.window(xlim=c(1,length(constraint)),ylim=range(table))
graphics::box()
constraint[constraint=="Inf"] <- "n"
graphics::axis(side=2)
graphics::axis(side=1,at=seq_along(constraint),labels=constraint,tick=FALSE,line=-1)
for(k in c(1,2)){
for(i in seq_along(models)){
lty <- ifelse(i%in%c(1,2,3),3,ifelse(i%in%c(4,5,6),2,1))
col <- ifelse(i==7,"#00007F","#FF3535")
pch <- ifelse(i%in%c(1,4),"x",ifelse(i%in%c(2,5),"z",1))
if(k==1){
graphics::lines(table[,i],col=col,lty=lty,lwd=2)
graphics::points(table[,i],col="white",pch=16,cex=1.2)
} else {
graphics::points(table[,i],col=col,pch=1,font=2)
}
}
}
}
graphics::title(ylab="deviance",line=0.0,outer=TRUE)
graphics::title(xlab="sparsity constraint",ylab="deviance",line=0.0,outer=TRUE)
```rs. The box plots show how much the paired lasso improves (dark) or deteriorates (bright) the \\textsc{auc} (left) and misclassification rate (right) of the competing models."}
### FIGURE CNV ###
#rm(list=ls())
#<<functions>>
graphics::par(oma=c(0,0,0,0),mar=c(2.1,3.5,0.5,0.5))
graphics::layout(matrix(c(1,1,2,2),nrow=1))
loss <- LOSS[[type]][c("deviance","auc","class")]
loss <- lapply(loss,function(x) x[rownames(x)=="10",])
model <- c(paste0("standard_",c("x","z","xz")),
paste0("adaptive_",c("x","z","xz")))
diff <- loss$auc[,"paired"]-loss$auc[,model]
palasso:::plot_box(diff,zero=TRUE,invert=TRUE,ylab="change")
diff <- loss$class[,"paired"]-loss$class[,model]
palasso:::plot_box(diff,zero=TRUE,ylab="change")
```r for \textsc{cnv}s. Each cell represents one cancer-cancer combination (row, column). The colour indicates whether the paired lasso leads to a low (dark) or high (bright) \textsc{auc}."}
FIGURE MAP
rm(list=ls())
<>
loss <- LOSS[["CNV"]][c("info","auc")]
cancer <- sort(unique(c(levels(loss$info$y0),levels(loss$info$y1))))
X <- matrix(NA,nrow=length(cancer),ncol=length(cancer),dimnames=list(cancer,cancer))
Z <- palasso:::.design(x=cancer)
y0 <- as.character(loss$info$y0)
y1 <- as.character(loss$info$y1)
X[cbind(y0,y1)] <- X[cbind(y1,y0)] <- loss$auc[rownames(loss$auc)=="10","paired"]
graphics::par(mar=c(0.5,3.0,3.0,0.5))
dimnames(X) <- lapply(dimnames(X),function(x) paste0(" ",x," "))
palasso:::plot_table(X=X,margin=-1,labels=FALSE,las=2,cex=0.7)
sort(rowMeans(X,na.rm=TRUE),decreasing=TRUE)[1:2] # keep!
```rs. Given $32$ cancer types, this matrix shows the assignment of $496$ dependent pairs to $31$ groups of $16$ independent pairs, with each symbol representing one group."}
### FIGURE COM ###
# 32 cancer types for isoform and miRNA
# 33 cancer types for gene and CNV
#rm(list=ls())
#<<functions>>
for(type in c("miRNA")){
cancer <- sort(unique(as.character(unlist(LOSS[[type]]$info[,c("y0","y1")]))))
n <- length(cancer)
z <- as.numeric(palasso:::.design(x=n))
x <- rep(seq_len(n),each=n)
y <- rep(seq(from=n,to=1,by=-1),times=n)
pch <- z
pch[pch==0] <- NA
pex <- c(".","O","*","+","o","-","'","x")
# colour
base <- grDevices::colorRampPalette(colors=c('darkblue','blue','red','darkred'))(n)
col <- rep(NA,times=length(z))
col[z==0] <- "white"
for(i in seq_len(n)){
col[z==i] <- base[i]
}
graphics::par(mfrow=c(1,1),mar=c(0,0,2,2))
graphics::plot.new()
graphics::plot.window(xlim=c(1,n),ylim=c(1,n))
graphics::points(x=x[pch<=25],y=y[pch<=25],
pch=pch[pch<=25],col=col[pch<=25],cex=0.9)
graphics::points(x=x[pch>25],y=y[pch>25],
pch=pex[(pch-25)[pch>25]],col=col[pch>25],cex=0.9)
graphics::segments(x0=0,x1=n+1,y0=n+1)
graphics::segments(x0=n+1,y0=n+1,y1=0)
graphics::segments(x0=0,x1=n+1,y0=n+1,y1=0,lty=2)
graphics::mtext(text=cancer,side=3,at=1:n,las=2,cex=0.7)
graphics::mtext(text=cancer,side=4,at=n:1,las=2,cex=0.7)
}
Try the palasso package in your browser
Any scripts or data that you put into this service are public.
palasso documentation built on April 19, 2021, 5:07 p.m.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
title: Sparse regression with paired covariates header-includes: \usepackage{amsmath} \usepackage{xcolor} \usepackage{caption}\captionsetup[figure]{labelformat=empty} \usepackage[section]{placeins} \definecolor{blue}{HTML}{0000CD} \definecolor{red}{HTML}{CD0000} output: rmarkdown::html_vignette vignette: > %\VignetteIndexEntry{script} %\VignetteEncoding{UTF-8} %\VignetteEngine{knitr::rmarkdown} editor_options: chunk_output_type: console
Code for reproducing the results shown in the manuscript.
# Set eval to TRUE to create Figures. # Set echo to TRUE for html, but to FALSE for pdf. knitr::opts_chunk$set(eval=FALSE,echo=TRUE,fig.path="images/") eval <- FALSE # TRUE or FALSE
Initialisation
### Loading functions. ### inst <- rownames(utils::installed.packages()) cran <- c("devtools","R.utils","Matrix","glmnet","pROC","BiocManager","ashr") # "googledrive", "httpuv" if(!all(cran %in% inst)){ for(i in seq_along(cran)){ if(!cran[i] %in% inst){ install.packages(cran[i]) } } } bioc <- c("edgeR","TCGAbiolinks") if(!all(bioc %in% inst)){ #source("http://bioconductor.org/biocLite.R") for(i in seq_along(bioc)){ if(!bioc[i] %in% inst){ #biocLite(bioc[i]) BiocManager::install(bioc[i]) } } } #if(!"ashr" %in% inst){ # devtools::install_github("stephens999/ashr") #} user <- Sys.getenv("USERNAME") path <- file.path("C:","Users",user,"Desktop","palasso") if(user=="arra"){path <- "C:/Users/arra/Desktop/MATHS/palasso_desktop"} if(user==""){path <- "/virdir/Scratch/arauschenberger/palasso"} setwd(path) folders <- c("data","results") invisible(sapply(folders,function(x) if(!dir.exists(x)){dir.create(x)})) if(user!="arra"){ devtools::install_github("kkdey/CorShrink") # ref="a9f6ba0" devtools::install_github("rauschenberger/palasso") # ref="4a995a2" } if(FALSE){ # The functions <<save>>, <<file.exists>> and <<file.remove>> access the hard disk, but also try to access googledrive. save <- function(object,file){ base::save(object,file=file) tryCatch(expr=googledrive::drive_upload(media=file,path=file), error=function(x) NULL) #Sys.sleep(0.5) } file.exists <- function(file){ offline <- base::file.exists(file) online <- FALSE if(!offline){ d <- googledrive::as_dribble(x=file) online <- tryCatch(expr=googledrive::some_files(d), error=function(x) FALSE) #Sys.sleep(0.5) } return(offline|online) } file.remove <- function(file){ base::file.remove(file) tryCatch(expr=googledrive::drive_trash(file=file), error=function(x) NULL) #Sys.sleep(0.5) } # The function <<update>> moves files from the research cloud to the remote drive. Given both paths, it first verifies whether the folders SIM, GDC and CCA are available, and then copies all missing files from the research cloud to the remote drive. # from: path to the origin # to: path to the destination update <- function(from,to){ dir <- c("SIM","GDC","CCA") if(any(!dir.exists(file.path(from,dir)))){stop("Invalid.")} if(any(!dir.exists(file.path(to,dir)))){stop("Invalid.")} pb <- utils::txtProgressBar(min=0,max=1,style=3) for(i in seq_along(dir)){ files0 <- dir(file.path(from,dir[i])) files1 <- dir(file.path(to,dir[i])) names <- files0[!files0 %in% files1] for(j in seq_along(names)){ utils::setTxtProgressBar(pb=pb,value=(i-1)/3+(j*i)/(3*length(names))) file.copy(from=file.path(from,dir[i],names[j]), to=file.path(to,dir[i],names[j]), copy.date=TRUE) } utils::setTxtProgressBar(pb=pb,value=i/3) } } # update(from="results",to="//tsclient/N/palasso/results") }
Preparation
Last data download started on 2019-03-26 (R version 3.5.3).
### Downloading "Isoform Expression Quantification". ### #rm(list=ls()) #<<functions>> directory <- file.path(path,"data") setwd(directory) # Retrieving cancer types: project <- TCGAbiolinks::getGDCprojects()$id project <- project[grepl(x=project,pattern="TCGA")] # Downloading isoform expression data: y <- X <- list() for(i in seq_along(project)){ query <- TCGAbiolinks::GDCquery(project=project[i], data.category="Transcriptome Profiling", data.type="Isoform Expression Quantification") TCGAbiolinks::GDCdownload(query,method="api",directory=directory) trace(TCGAbiolinks:::readTranscriptomeProfiling,tracer=quote(ignore.case<-TRUE)) X[[i]] <- TCGAbiolinks::GDCprepare(query,directory=directory) X[[i]][,c("miRNA_ID","reads_per_million_miRNA_mapped", "cross-mapped","miRNA_region")] <- NULL y[[i]] <- rep(project[i],times=length(unique(X[[i]]$barcode))) } save(list=c("y","X"),file=file.path(path,"data","isoform_raw.RData")) load(file.path(path,"data","isoform_raw.RData"),verbose=TRUE) # Merging isoform expression data: Xs <- do.call(what=rbind,args=X) # sparse matrix y <- do.call(what="c",args=y) # Transform to matrix Xs$isoform_coords <- gsub(pattern="hg38:chr",replacement="",x=Xs$isoform_coords) samples <- unique(Xs$barcode) covariates <- unique(Xs$isoform_coords) row <- match(Xs$barcode,samples) col <- match(Xs$isoform_coords,covariates) X <- Matrix::sparseMatrix(i=row,j=col,x=Xs$read_count,dimnames=list(samples,covariates)) # Order by molecular location split <- strsplit(x=colnames(X),split=":|-") chr <- sapply(split,function(x) x[[1]]) pos <- sapply(split,function(x) x[[2]]) order <- order(chr,pos) X <- X[,order] if(FALSE){ # testing i <- sample(seq_len(nrow(Xs)),size=1) Xs$read_count[i] X[Xs$barcode[i],Xs$isoform_coords[i]] } save(list=c("y","X"),file=file.path(path,"data","isoform_all.RData"))
### Downloading "miRNA Expression Quantification". ### #rm(list=ls()) #<<functions>> directory <- file.path(path,"data") setwd(directory) # Downloading data. project <- TCGAbiolinks::getGDCprojects()$id project <- project[grepl(x=project,pattern="TCGA")] y <- X <- list() for(i in seq_along(project)){ query <- TCGAbiolinks::GDCquery(project=project[i], data.category="Transcriptome Profiling", data.type="miRNA Expression Quantification") TCGAbiolinks::GDCdownload(query,method="api",directory=directory) trace(TCGAbiolinks:::readTranscriptomeProfiling,tracer=quote(ignore.case<-TRUE)) data <- TCGAbiolinks::GDCprepare(query,directory=directory) X[[i]] <- t(data[,c(seq(from=2,to=ncol(data),by=3))]) y[[i]] <- rep(project[i],times=nrow(X[[i]])) } save(list=c("y","X"),file=file.path(path,"data","miRNA_raw.RData")) load(file.path(path,"data","miRNA_raw.RData")) X <- do.call(what=rbind,args=X) y <- do.call(what="c",args=y) rownames(X) <- gsub(pattern="read_count_",replacement="",x=rownames(X)) save(list=c("y","X"),file=file.path(path,"data","miRNA_all.RData"))
### Downloading "Gene Expression Quantification". ### #rm(list=ls()) #<<functions>> directory <- file.path(path,"data") setwd(directory) # Retrieving cancer types: project <- TCGAbiolinks::getGDCprojects()$id project <- project[grepl(x=project,pattern="TCGA")] # Downloading data: memory.limit(size=16000) # Activate virtual memory in system control! y <- X <- list() for(i in seq_along(project)){ query <- TCGAbiolinks::GDCquery(project=project[i], data.category="Transcriptome Profiling", data.type="Gene Expression Quantification", workflow.type="HTSeq - Counts"); gc() TCGAbiolinks::GDCdownload(query=query,method="api",directory=directory); gc() trace(TCGAbiolinks:::readTranscriptomeProfiling,tracer=quote(ignore.case<-TRUE)); gc() X[[i]] <- TCGAbiolinks::GDCprepare(query,directory=directory); gc() y[[i]] <- rep(project[i],times=ncol(X[[i]])); gc() } save(list=c("y","X"),file=file.path(path,"data","gene_raw.RData")) load(file.path(path,"data","gene_raw.RData")) genes <- SummarizedExperiment::rowData(X[[1]]) mart <- biomaRt::useMart("ensembl",dataset="hsapiens_gene_ensembl") # char <- biomaRt::getBM(attributes=c("ensembl_gene_id","chromosome_name","transcript_start","gene_biotype"),filters=c("biotype","chromosome_name"),values=list("protein_coding",c(1:22,"X")),mart=mart) select <- genes$ensembl_gene_id[genes$ensembl_gene_id %in% char$ensembl_gene_id] X <- lapply(X,function(x) t(SummarizedExperiment::assays(x)$"HTSeq - Counts"[select,])) X <- do.call(what=rbind,args=X) y <- do.call(what="c",args=y) save(list=c("y","X"),file=file.path(path,"data","gene_all.RData"))
### Downloading "Copy Number Variation". ### #rm(list=ls()) #<<functions>> directory <- file.path(path,"data") setwd(directory) project <- TCGAbiolinks::getGDCprojects()$id project <- project[grepl(x=project,pattern="TCGA")] y <- X <- list() for(i in seq_along(project)){ query <- TCGAbiolinks::GDCquery(project=project[i], data.category="Copy Number Variation", data.type="Masked Copy Number Segment") TCGAbiolinks::GDCdownload(query=query,method="api",directory=directory) trace(TCGAbiolinks:::readTranscriptomeProfiling,tracer=quote(ignore.case<-TRUE)) X[[i]] <- TCGAbiolinks::GDCprepare(query,directory=directory) y[[i]] <- rep(project[i],times=length(unique(X[[i]]$Sample))) # correct? } save(list=c("y","X"),file=file.path(path,"data","CNV_raw.RData")) load(file.path(path,"data","CNV_raw.RData"),verbose=TRUE) # Merging CNV data: Xs <- do.call(what=rbind,args=X) # sparse matrix y <- do.call(what="c",args=y) #table(Xs$Sample) # Prepare cutting. cut <- list() cut$chr <- c(1:22,"X") cut$start <- sapply(cut$chr,function(x) min(Xs$Start[Xs$Chromosome==x])) cut$end <- sapply(cut$chr,function(x) max(Xs$End[Xs$Chromosome==x])) cut$length <- cut$end-cut$start cut$dist <- sum(cut$length)/10000 cut$num <- round(cut$length/cut$dist) # Create covariates. cov <- list() cov$p <- sum(cut$num) cov$chromosome <- unlist(sapply(cut$chr,function(i) rep(i,times=cut$num[i]))) cov$location <- unlist(sapply(cut$chr,function(i) round(seq(from=cut$start[i],to=cut$end[i],length.out=cut$num[i])))) cov$name <- paste0(cov$chromosome,":",cov$location) # Create indices for each covariate. index <- rep(list(integer()),times=cov$p) pb <- utils::txtProgressBar(min=0,max=cov$p,style=3) for(j in seq_len(cov$p)){ utils::setTxtProgressBar(pb=pb,value=j) index[[j]] <- which((Xs$Chromosome==cov$chromosome[j]) & (Xs$Start<=cov$location[j]) & (cov$location[j]<=Xs$End)) # consider < } # Expand indices to matrix. X <- matrix(0,nrow=length(unique(Xs$Sample)),ncol=cov$p, dimnames=list(unique(Xs$Sample),cov$name)) for(j in seq_along(index)){ mean <- Xs$Segment_Mean[index[[j]]] i <- Xs$Sample[index[[j]]] X[i,j] <- mean } if(FALSE){ # test sample <- sample(rownames(X),size=1) covariate <- sample(colnames(X),size=1) split <- strsplit(covariate,split=":")[[1]] a <- X[sample,covariate] b <- Xs$Segment_Mean[(Xs$Sample==sample) & (Xs$Chromosome==split[1]) & (Xs$Start<=as.numeric(split[2])) & (as.numeric(split[2]) < Xs$End)] all(a==b) } save(list=c("y","X","index"),file=file.path(path,"data","CNV_all.RData"))
### Extracting samples of interest. ### #rm(list=ls()) #<<functions>> type <- c("isoform","miRNA","CNV","gene") for(i in seq_along(type)){ cat(type[i],"\n") load(file.path(path,"data",paste0(type[i],"_all.RData")),verbose=TRUE) # TCGA barcode barcode <- rownames(X) code <- sapply(barcode,function(x) strsplit(x,split="-")) code <- as.data.frame(do.call(what=rbind,args=code)) colnames(code) <- c("project","TSS","participant","sample_vial", "portion_analyte","plate","center") code$sample <- substr(code$sample_vial,start=1,stop=2) code$vial <- substr(code$sample_vial,start=3,stop=3) code$portion <- substr(code$portion_analyte,start=1,stop=2) code$analyte <- substr(code$portion_analyte,start=3,stop=3) code$sample_vial <- code$portion_analyte <- NULL # solid tumour (except blood for LAML) solid <- (code$sample=="01" | (y=="TCGA-LAML" & code$sample=="03")) X <- X[solid,] y <- y[solid] # unique samples unique <- !duplicated(substr(rownames(X),start=1,stop=12)) X <- X[unique,] y <- y[unique] save(list=c("y","X"),file=file.path(path,"data",paste0(type[i],"_sub.RData"))) } # isoform: n=9'794, p=194'595, k=32 # miRNA: n=9'794, p=1'881, k=32 # gene: n=9'830, p=19'602, k=33 # CNV: n=10'578, p=10'000, k=33 ## Understanding barcodes: # overview: https://wiki.nci.nih.gov/display/TCGA/TCGA+barcode # details: https://gdc.cancer.gov/resources-tcga-users/tcga-code-tables ## Understanding replicate samples: # http://gdac.broadinstitute.org/runs/sampleReports/latest/READ_Replicate_Samples.html
Analysis
Last data analysis started on 2019-04-12 (R version 3.5.3).
### Analysing the TCGA data. ### #rm(list=ls()) #<<functions>> for(type in c("miRNA","isoform","CNV","gene")){ library(Matrix) for(k in c(207,sample(528))){ set.seed(k); cat(k," ") if(type %in% c("isoform","miRNA") & k > 496){next} if(type %in% c("CNV","gene") & k > 528){next} # searching for missing cancer-cancer combinations rm(list=setdiff(ls(),c("k","type","path","save","file.exists","file.remove"))); gc() file0 <- paste0("results/",type,"_start_",k,".RData") file1 <- paste0("results/",type,"_loss_",k,".RData") if(file.exists(file0)||file.exists(file1)){next} save(object=k,file=file0) load(paste0("data/",type,"_sub.RData")) # indicating the cancer-cancer combination cancer <- substring(text=unique(y),first=6) comb <- utils::combn(x=cancer,m=2) select <- paste0("TCGA-",comb[,k]) y <- ifelse(y==select[1],1,ifelse(y==select[2],0,NA)) rm(cancer,select) # removing other cancer types cond <- !is.na(y) y <- y[cond] X <- X[cond,] rm(cond) # pre-processing if(type %in% c("isoform","miRNA")){ x <- palasso:::.prepare(X,cutoff="zero") } else if(type=="gene"){ x <- palasso:::.prepare(X,cutoff="knee") } else if(type=="CNV"){ x <- list(X=X,Z=sign(X)) x <- lapply(x,function(x) scale(x)) attributes(x)$info <- data.frame(n=nrow(X),p=ncol(X),prop=mean(x$Z==0)) } rm(X) # cross-validation loss <- tryCatch(expr=palasso:::.predict(y=y,X=x,nfolds.int=10),error=function(e) palasso:::.predict(y=y,X=x,nfolds.int=10)) # information loss$info <- cbind(k=k, y0=comb[2,k], y1=comb[1,k], n0=sum(y==0), n1=sum(y==1), attributes(x)$info, loss$info) # refit object <- palasso::palasso(y=y,X=x,nfolds=10,family="binomial",standard=TRUE,elastic=TRUE,shrink=TRUE) model <- c(names(object),"elastic", paste0("paired.",c("adaptive","standard","combined"))) for(max in c(10,50,Inf)){ temp <- list() temp$nzero <- data.frame(model=model,x=NA,z=NA) for(i in seq_along(model)){ coef <- palasso:::coef.palasso(object=object,model=model[i],max=max) temp$nzero$x[i] <- sum(coef$x!=0) temp$nzero$z[i] <- sum(coef$z!=0) } temp$select <- palasso:::subset.palasso(x=object,max=max, model="paired.adaptive")$palasso$select temp$weights <- palasso:::weights.palasso(object=object,max=max, model="paired.adaptive") temp$coef <- palasso:::coef.palasso(object=object,max=max, model="paired.adaptive") loss[[paste0("fit",max)]] <- temp } save(object=loss,file=file1) file.remove(file0) } index <- sum(grepl(dir(),pattern="sessionInfo")) sink(paste0("sessionInfo",index+1,".txt")) date() utils::sessionInfo() devtools::session_info() sink() }
# The function <<collect>> loads all files from PATH including PATTERN in the file name, loads OBJECT into a list, and executes a function call. #<<functions>> # path: folder # pattern: character, or NULL (all files) # object: character vector, or NULL (all objects) # what: function call collect <- function(path=getwd(),pattern="",object=NULL,what="rbind"){ OBJECT = object # identify files files <- dir(path) files <- files[grepl(x=files,pattern=pattern)] files <- files[grepl(x=files,pattern=".RData")] number <- gsub(pattern=paste0(pattern,"|.RData"),replacement="",x=files) files <- files[order(as.numeric(number))] # trial1 names <- gsub(pattern=".RData",replacement="",x=files) # trial1 if(length(files)==0){stop("Invalid datasets.")} # load data all <- list() for(i in seq_along(files)){ x <- load(file.path(path,files[i])) x <- eval(parse(text=x)) if(is.null(OBJECT)){ all[[i]] <- x names(all)[i] <- names[i] } else { for(j in seq_along(OBJECT)){ all[[OBJECT[j]]][[i]] <- x[[OBJECT[j]]] names(all[[OBJECT[j]]])[i] <- names[i] } } } # fuse data if(is.null(OBJECT)){ all <- do.call(what=what,args=all) } else { all <- lapply(all,function(x) do.call(what=what,args=x)) } return(all) } LOSS <- list() type <- c("gene","isoform","miRNA","CNV") #type <- "miRNA" for(i in seq_along(type)){ LOSS[[type[i]]] <- collect(path="results", pattern=paste0(type[i],"_loss_"), object=c("deviance","auc","class","info", paste0("fit",c(10,50,Inf)))) } for(i in seq_along(LOSS)){ for(j in 1:3){ colnames(LOSS[[i]][[j]])[colnames(LOSS[[i]][[j]])=="paired.adaptive"] <- "paired" } } #type <- "gene" #a <- LOSS[[type]]$deviance[rownames(LOSS[[type]]$deviance)=="10","paired"] #b <- LOSS[[type]]$deviance[rownames(LOSS[[type]]$deviance)=="10","elastic"] #mean(a<b)
### Testing for significant differences. ### #rm(list=ls()) #<<functions>> #<<collect>> row <- c("gene","isoform","miRNA","CNV") col <- c("10","Inf") lay <- c("standard_x","standard_z","standard_xz", "adaptive_x","adaptive_z","adaptive_xz", "elastic") # added "elastic" M <- array(NA,dim=c(length(row),length(col),length(lay)),dimnames=list(row,col,lay)) for(i in seq_along(row)){ loss <- LOSS[[row[i]]][c("info","deviance")] y0 <- as.character(loss$info$y0) y1 <- as.character(loss$info$y1) cancer <- sort(unique(c(y0,y1))) Z <- palasso:::.design(x=cancer) for(j in seq_along(col)){ # differences cond <- rownames(loss$deviance)==col[j] for(k in seq_along(lay)){ fill <- loss$deviance[cond,lay[k]] - loss$deviance[cond,"paired"] X <- matrix(NA,nrow=length(cancer),ncol=length(cancer), dimnames=list(cancer,cancer)) X[cbind(y0,y1)] <- X[cbind(y1,y0)] <- fill X[lower.tri(X)] <- NA # p-values pvalue <- rep(NA,times=max(Z)) for(l in seq_len(max(Z))){ x <- as.numeric(X[Z==l]) if(col[j]=="10"){ alternative <- "greater" # Never use "two.sided"! } if(col[j]=="Inf"){ alternative <- "less" # Never use "two.sided"! } pvalue[l] <- stats::wilcox.test(x=x,alternative=alternative, exact=FALSE)$p.value } # Simes M[i,j,k] <- palasso:::.combine(pvalue,method="simes") } } } # Table SIG: significance constraint <- "10" table <- format(M[,constraint,1:6],digits=1,scientific=FALSE) for(i in seq_len(nrow(table))){ for(j in seq_len(ncol(table))){ if(M[i,constraint,j]>=0.05){ table[i,j] <- paste0("{\\color{gray}{",table[i,j],"}}") } } } one <- c("","\\text{standard}","","","\\text{adaptive}","") two <- paste0("\\text{",c("x","z","xz","x","z","xz"),"}") rownames(table) <- paste0("\\text{",rownames(table),"}") table <- rbind(one,two,table,deparse.level=0) rownames(table)[1] <- "~" xtable <- xtable::xtable(table,align=c("r","|","c","c","c","|","c","c","c")) xtable::print.xtable(xtable,type="latex",include.colnames=FALSE,sanitize.text.function=identity)
### Comparison with elastic net. ### #rm(list=ls()) #<<functions>> #<<collect>> row <- c("gene","isoform","miRNA","CNV") col <- c("10","50","Inf") better <- worse <- less <- matrix(NA,nrow=length(row),ncol=length(col), dimnames=list(row,col)) for(i in seq_along(row)){ for(j in seq_along(col)){ # proportion of improvements (cross-validation) cond <- rownames(LOSS[[row[i]]]$deviance)==col[j] loss <- LOSS[[row[i]]]$deviance[cond,c("paired","elastic")] better[i,j] <- round(mean(loss[,"paired"]<loss[,"elastic"]),digits=2) worse[i,j] <- round(mean(loss[,"paired"]>loss[,"elastic"]),digits=2) # average difference in nzero (refitted models) df_paired <- apply(LOSS[[row[i]]][[paste0("fit",col[j])]],1,function(x) sum(x$nzero[x$nzero[,"model"]=="paired.adaptive",c("x","z")])) df_elastic <- apply(LOSS[[row[i]]][[paste0("fit",col[j])]],1,function(x) sum(x$nzero[x$nzero[,"model"]=="elastic95",c("x","z")])) df_diff <- df_elastic-df_paired less[i,j] <- round(mean(df_diff),digits=2) #graphics::hist(df_diff,main=paste(row[i],col[j]),xlim=c(-1,1)*max(abs(df_diff))) } } better worse less
### Analysing the refitted models. ### #rm(list=ls()) #<<functions>> #<<collect>> # Table SEL: selected model nzero <- paste0("fit",c(5,10,Inf)) model <- c(paste0("standard_",c("x","z","xz")), paste0("adaptive_",c("x","z","xz")), "between_xz","within_xz") type <- c("gene","isoform","miRNA","CNV") table <- array(NA,dim=c(length(nzero),length(model),length(type)), dimnames=list(nzero,model,type)) for(i in seq_along(nzero)){ for(j in seq_along(model)){ for(k in seq_along(type)){ sub <- LOSS[[type[k]]][[nzero[i]]] table[i,j,k] <- sum(sub[,"select"]==model[j]) } } } colSums(table["fit10",,]) # CHECK WHETHER COMPLETE! table <- round(prop.table(table["fit10",,],margin=2),digits=2) table <- t(table) table <- table[,apply(table,2,function(x) any(x!=0))] rownames(table) <- paste0("\\text{",rownames(table),"}") xtable <- xtable::xtable(table,align=c("r","|","c","c","c","c")) xtable::print.xtable(xtable,type="latex",include.colnames=FALSE,sanitize.text.function=identity) # selected weights and covariates type <- c("gene","isoform","miRNA","CNV") group <- c("x","z") model <- c(paste0("standard_",c("x","z","xz")), paste0("adaptive_",c("x","z","xz")), "paired.adaptive","elastic") # added "elastic" , paste0("elastic",c(100,75,50,25)) weights10 <- weightsInf <- matrix(NA,nrow=length(group),ncol=length(type), dimnames=list(group,type)) coef10 <- coefInf <- array(NA,dim=c(length(group),length(type),length(model)), dimnames=list(group,type,model)) for(i in seq_along(group)){ for(j in seq_along(type)){ weights10[,j] <- rowMeans(sapply(LOSS[[type[j]]]$fit10[,"weights"],colMeans)) weightsInf[,j] <- rowMeans(sapply(LOSS[[type[j]]]$fitInf[,"weights"],colMeans)) for(k in seq_along(model)){ coef10[i,j,k] <- mean(sapply(LOSS[[type[j]]]$fit10[,"nzero"], function(x) sum(x[x$model==model[k],group[i]]))) coefInf[i,j,k] <- mean(sapply(LOSS[[type[j]]]$fitInf[,"nzero"], function(x) sum(x[x$model==model[k],group[i]]))) } } } # coef10["x",,]+coef10["z",,] # with sparsity constraint round(prop.table(weights10,margin=2),2) round(prop.table(coef10[,,"paired.adaptive"],margin=2),2) round(colSums(coef10[,,"paired.adaptive"]),2) # natural sparsity round(prop.table(weightsInf,margin=2),2) round(prop.table(coefInf[,,"paired.adaptive"],margin=2),2) round(colSums(coefInf[,,"paired.adaptive"]),2) round(colSums(coefInf[,,"elastic"])/colSums(coefInf[,,"paired.adaptive"]),1) # multiple nzero of elastic net and paired lasso # Table NSC: number of non-zero coefficients table <- round(coefInf["x",,]+coefInf["z",,]) colnames(table)[7] <- "paired" one <- c("","\\text{standard}","","","\\text{adaptive}","","\\text{paired}","\\text{elastic}") two <- paste0("\\text{",c("x","z","xz","x","z","xz","xz","xz"),"}") rownames(table) <- paste0("\\text{",rownames(table),"}") table <- rbind(one,two,table,deparse.level=0) rownames(table)[1] <- "~" xtable <- xtable::xtable(table,align=c("r","|","c","c","c","|","c","c","c","|","c","|","c")) xtable::print.xtable(xtable,type="latex",include.colnames=FALSE,sanitize.text.function=identity)
Figures
### FIGURE CSW ### #rm(list=ls()) #<<functions>> set.seed(1) overfit <- TRUE # simulate n <- 10 cx <- stats::rbeta(n=n,shape1=0.9,shape2=1) cz <- stats::rbeta(n=n,shape1=0.4,shape2=0.9) # collection x <- list() y <- list() # adaptive weights (X only) x[[1]] <- rep(1,times=n) if(overfit){x[[1]] <- cx} y[[1]] <- rep(0,times=n) # adaptive weights (Z only) x[[2]] <- rep(0,times=n) y[[2]] <- rep(1,times=n) if(overfit){y[[2]] <- cz} # adaptive weights (X and Z) x[[3]] <- y[[3]] <- rep(0.5,times=n) if(overfit){x[[3]] <- cx} if(overfit){y[[3]] <- cz} # within-pair weights x[[4]] <- cx^2/(cx+cz) y[[4]] <- cz^2/(cx+cz) # visualisation graphics::par(mfrow=c(1,4),mar=c(4.5,0.5,0.5,0.5),oma=c(0,2,0,0)) for(i in seq_len(4)){ palasso:::plot_pairs(x=x[[i]],y=y[[i]],lwd=4) if(i==1){ graphics::mtext(text="covariate pair",side=2,line=1) } }
```r provides suitable isomi\textsc{r} data for $9\,794$ samples (left), from $32$ cancer types (centre), forming $496$ cancer-cancer combinations (right). Each sample appears in $31$ combinations."}
FIGURE DIA
rm(list=ls())
<>
ellipse <- function(x,y,a=0.2,b=0.25,border=NA){ n <- max(c(length(x),length(y))) if(length(x)==1){x <- rep(x,times=n)} if(length(y)==1){y <- rep(y,times=n)} if(length(border)==1){border <- rep(border,times=n)} for(i in seq_len(n)){ angle <- seq(from=0,to=2*pi,length=100) xs <- x[i] + a * cos(angle) ys <- y[i] + b * sin(angle) graphics::polygon(x=xs,y=ys,col=grey(0.9),border=border[i]) } }
cancer <- c("ACC","BLCA","BRCA","UVM") number <- c(80,409,1078,80) col <- grDevices::rgb(red=0,green=0,blue=sample(seq(from=75,to=255,length.out=length(number))),maxColorValue=255)
lwd <- log(2number)-2 lwd = pmax(5number/max(number),1) x1 <- 1.3; x2 <- 2; x3 <- 3
set.seed(1)
first layer (bubble)
graphics::plot.new() graphics::par(mar=c(0,0,0,0)) graphics::plot.window(xlim=c(1.1,3.3),ylim=c(-1.6,1.6)) ellipse(x=x1,y=0) graphics::text(x=x1,y=0,labels="TCGA",font=2,adj=c(0.5,0)) graphics::text(x=x1,y=0,labels="n=9794",adj=c(0.5,1.2),cex=0.9)
second layer (colon)
y1 <- seq(from=1,to=-1,length.out=length(cancer)+1) graphics::text(x=x2,y=y1[length(cancer)],labels="...",font=2,srt=90) y1 <- y1[-length(cancer)]
first-second layer (connect)
graphics::segments(x0=x1+0.2,y0=0,x1=x2-0.2,y1=y1,lwd=lwd,col=col)
second layer (bubble)
ellipse(x=x2,y=y1,a=0.2,b=0.2) graphics::text(x=x2,y=y1,labels=cancer,font=2,col=col,adj=c(0.5,0)) graphics::text(x=x2,y=y1,labels=paste0("n=",number,""),adj=c(0.5,1.2),cex=0.9)
comb <- utils::combn(x=seq_along(y1),m=2)
third layer (colon)
y2 <- seq(from=1.5,to=-1.5,length.out=ncol(comb)+1) graphics::text(x=x3,y=y2[ncol(comb)],labels="...",font=2,srt=90) y2 <- y2[-ncol(comb)]
second-third layer (connect)
graphics::segments(x0=2.2,y0=y1[comb[1,]],x1=2.7,y1=y2,lwd=lwd[comb[1,]],col=col[comb[1,]]) graphics::segments(x0=2.2,y0=y1[comb[2,]],x1=2.7,y1=y2,lwd=lwd[comb[2,]],col=col[comb[2,]])
third layer (bubble)
ellipse(x=x3,y=y2,a=0.3,b=0.22) graphics::text(x=x3,y=y2,labels=paste0(cancer[comb[1,]]," "), font=2,col=col[comb[1,]],adj=c(1,0)) graphics::text(x=x3,y=y2,labels=paste0(" ",cancer[comb[2,]]), font=2,col=col[comb[2,]],adj=c(0,0)) graphics::text(x=x3,y=y2,labels=":",font=2,adj=c(0.5,0)) labels <- apply(comb,2,function(x) sum(number[x])) labels <- paste0("n=",labels,"") graphics::text(x=x3,y=y2,labels=labels,adj=c(0.5,1.2),cex=0.9)
```rs, mi\\textsc{rna}s and \\textsc{cnv}s (from top to bottom). The bar charts (left) count how often the paired lasso leads to a lower (dark) or higher (bright) deviance than the competing model. The box plots (right) show how much lower (dark) or higher (bright) the deviance is."}
### FIGURE CLA ###
#rm(list=ls())
#<<functions>>
graphics::par(mfrow=c(4,2),oma=c(0,0,0,0),mar=c(2.1,3.5,0.5,0.5))
for(type in c("gene","isoform","miRNA","CNV")){
loss <- LOSS[[type]][c("deviance","auc","class")]
choice <- "paired"
loss <- lapply(loss,function(x) x[,c(paste0("standard_",c("x","z","xz")),paste0("adaptive_",c("x","z","xz")),choice)])
for(constraint in c("10")){ # c("5","10","Inf")
# change
sub <- lapply(loss,function(x) x[rownames(x)==constraint,])
palasso:::plot_score(sub$deviance,choice=choice)
change <- sub$deviance[,7]-sub$deviance[,-7]
palasso:::plot_box(change,ylab="change",zero=TRUE,choice=NA)
# info
info <- list()
info$select <- names(which.min(apply(sub$deviance,2,median)[-7]))
info$DEV_paired <- median(sub$deviance[,choice])
info$DEV_select <- median(sub$deviance[,info$select])
info$improve <- mean(sub$deviance[,info$select]>sub$deviance[,choice])
info$AUC_paired <- median(sub$auc[,choice])
info$CLASS_paired <- median(sub$class[,choice])
print(as.data.frame(info)) # important
}
}
```rs (top right), mi\textsc{rna}s (bottom left) and \textsc{cnv}s (bottom right). The median deviances ($y$-axis) of the standard (dotted), adaptive (dashed) and paired (solid) lasso converge as the sparsity constraint ($x$-axis) increases."}
FIGURE DEC
rm(list=ls())
<>
graphics::par(oma=c(1.0,1.0,0,0),mar=c(1.5,3.0,0.5,0.5),mfrow=c(1,1))
graphics::par(oma=c(1.0,1.0,0,0),mar=c(1.5,3.0,0.5,0.5),mfrow=c(2,2))
for(type in c("gene","isoform","miRNA","CNV")){ models <- c(paste0("standard_",c("x","z","xz")), paste0("adaptive_",c("x","z","xz")),"paired") constraint <- c("3","4","5","10","15","20","25","50","Inf")
loss <- LOSS[[type]]["deviance"] loss <- lapply(loss,function(x) x[,models]) table <- matrix(NA,nrow=length(constraint),ncol=length(models), dimnames=list(constraint,models)) for(i in seq_along(constraint)){ sub <- lapply(loss,function(x) x[rownames(x)==constraint[i],]) table[i,] <- apply(sub$deviance,2,median) } # table <- log(table) graphics::plot.new() graphics::plot.window(xlim=c(1,length(constraint)),ylim=range(table)) graphics::box() constraint[constraint=="Inf"] <- "n" graphics::axis(side=2) graphics::axis(side=1,at=seq_along(constraint),labels=constraint,tick=FALSE,line=-1) for(k in c(1,2)){ for(i in seq_along(models)){ lty <- ifelse(i%in%c(1,2,3),3,ifelse(i%in%c(4,5,6),2,1)) col <- ifelse(i==7,"#00007F","#FF3535") pch <- ifelse(i%in%c(1,4),"x",ifelse(i%in%c(2,5),"z",1)) if(k==1){ graphics::lines(table[,i],col=col,lty=lty,lwd=2) graphics::points(table[,i],col="white",pch=16,cex=1.2) } else { graphics::points(table[,i],col=col,pch=1,font=2) } } }
} graphics::title(ylab="deviance",line=0.0,outer=TRUE) graphics::title(xlab="sparsity constraint",ylab="deviance",line=0.0,outer=TRUE)
```rs. The box plots show how much the paired lasso improves (dark) or deteriorates (bright) the \\textsc{auc} (left) and misclassification rate (right) of the competing models."} ### FIGURE CNV ### #rm(list=ls()) #<<functions>> graphics::par(oma=c(0,0,0,0),mar=c(2.1,3.5,0.5,0.5)) graphics::layout(matrix(c(1,1,2,2),nrow=1)) loss <- LOSS[[type]][c("deviance","auc","class")] loss <- lapply(loss,function(x) x[rownames(x)=="10",]) model <- c(paste0("standard_",c("x","z","xz")), paste0("adaptive_",c("x","z","xz"))) diff <- loss$auc[,"paired"]-loss$auc[,model] palasso:::plot_box(diff,zero=TRUE,invert=TRUE,ylab="change") diff <- loss$class[,"paired"]-loss$class[,model] palasso:::plot_box(diff,zero=TRUE,ylab="change")
```r for \textsc{cnv}s. Each cell represents one cancer-cancer combination (row, column). The colour indicates whether the paired lasso leads to a low (dark) or high (bright) \textsc{auc}."}
FIGURE MAP
rm(list=ls())
<>
loss <- LOSS[["CNV"]][c("info","auc")]
cancer <- sort(unique(c(levels(loss$info$y0),levels(loss$info$y1)))) X <- matrix(NA,nrow=length(cancer),ncol=length(cancer),dimnames=list(cancer,cancer))
Z <- palasso:::.design(x=cancer)
y0 <- as.character(loss$info$y0) y1 <- as.character(loss$info$y1) X[cbind(y0,y1)] <- X[cbind(y1,y0)] <- loss$auc[rownames(loss$auc)=="10","paired"]
graphics::par(mar=c(0.5,3.0,3.0,0.5)) dimnames(X) <- lapply(dimnames(X),function(x) paste0(" ",x," ")) palasso:::plot_table(X=X,margin=-1,labels=FALSE,las=2,cex=0.7)
sort(rowMeans(X,na.rm=TRUE),decreasing=TRUE)[1:2] # keep!
```rs. Given $32$ cancer types, this matrix shows the assignment of $496$ dependent pairs to $31$ groups of $16$ independent pairs, with each symbol representing one group."} ### FIGURE COM ### # 32 cancer types for isoform and miRNA # 33 cancer types for gene and CNV #rm(list=ls()) #<<functions>> for(type in c("miRNA")){ cancer <- sort(unique(as.character(unlist(LOSS[[type]]$info[,c("y0","y1")])))) n <- length(cancer) z <- as.numeric(palasso:::.design(x=n)) x <- rep(seq_len(n),each=n) y <- rep(seq(from=n,to=1,by=-1),times=n) pch <- z pch[pch==0] <- NA pex <- c(".","O","*","+","o","-","'","x") # colour base <- grDevices::colorRampPalette(colors=c('darkblue','blue','red','darkred'))(n) col <- rep(NA,times=length(z)) col[z==0] <- "white" for(i in seq_len(n)){ col[z==i] <- base[i] } graphics::par(mfrow=c(1,1),mar=c(0,0,2,2)) graphics::plot.new() graphics::plot.window(xlim=c(1,n),ylim=c(1,n)) graphics::points(x=x[pch<=25],y=y[pch<=25], pch=pch[pch<=25],col=col[pch<=25],cex=0.9) graphics::points(x=x[pch>25],y=y[pch>25], pch=pex[(pch-25)[pch>25]],col=col[pch>25],cex=0.9) graphics::segments(x0=0,x1=n+1,y0=n+1) graphics::segments(x0=n+1,y0=n+1,y1=0) graphics::segments(x0=0,x1=n+1,y0=n+1,y1=0,lty=2) graphics::mtext(text=cancer,side=3,at=1:n,las=2,cex=0.7) graphics::mtext(text=cancer,side=4,at=n:1,las=2,cex=0.7) }
Try the palasso package in your browser
Any scripts or data that you put into this service are public.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
Embedding an R snippet on your website
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.