#' @name clustering
#' @rdname clustering
-#' @aliases clusteringTask1 computeClusters1 computeClusters2
+#' @aliases clusteringTask1 clusteringTask2 computeClusters1 computeClusters2
#'
#' @title Two-stage clustering, withing one task (see \code{claws()})
#'
#' @rdname clustering
#' @export
clusteringTask1 = function(
- indices, getContribs, K1, nb_series_per_chunk, ncores_clust=1, verbose=FALSE, parll=TRUE)
+ indices, getContribs, K1, nb_items_per_chunk, ncores_clust=1, verbose=FALSE, parll=TRUE)
{
if (verbose)
cat(paste("*** Clustering task 1 on ",length(indices)," lines\n", sep=""))
#' @rdname clustering
#' @export
-clusteringTask2 = function(medoids, K2,
- getRefSeries, nb_ref_curves, nb_series_per_chunk, ncores_clust=1,verbose=FALSE,parll=TRUE)
+clusteringTask2 = function(medoids, K2, getRefSeries, nb_ref_curves,
+ nb_series_per_chunk, nbytes,endian,ncores_clust=1,verbose=FALSE,parll=TRUE)
{
if (verbose)
cat(paste("*** Clustering task 2 on ",nrow(medoids)," lines\n", sep=""))
return (medoids)
synchrones = computeSynchrones(medoids,
getRefSeries, nb_ref_curves, nb_series_per_chunk, ncores_clust, verbose, parll)
- distances = computeWerDists(synchrones, ncores_clust, verbose, parll)
+ distances = computeWerDists(synchrones, nbytes, endian, ncores_clust, verbose, parll)
medoids[ computeClusters2(distances,K2,verbose), ]
}
{
if (verbose)
cat(paste(" computeClusters1() on ",nrow(contribs)," lines\n", sep=""))
- cluster::pam(contribs, K1, diss=FALSE)$id.med
+ cluster::pam( t(contribs) , K1, diss=FALSE)$id.med
}
#' @rdname clustering
{
if (verbose)
cat(paste(" computeClusters2() on ",nrow(distances)," lines\n", sep=""))
- cluster::pam(distances, K2, diss=TRUE)$id.med
+ cluster::pam( distances , K2, diss=TRUE)$id.med
}
#' computeSynchrones
#' @param nb_ref_curves How many reference series? (This number is known at this stage)
#' @inheritParams claws
#'
-#' @return A big.matrix of size K1 x L where L = data_length
+#' @return A big.matrix of size L x K1 where L = length of a serie
#'
#' @export
computeSynchrones = function(medoids, getRefSeries,
computeSynchronesChunk = function(indices)
{
+ if (parll)
+ {
+ require("bigmemory", quietly=TRUE)
+ requireNamespace("synchronicity", quietly=TRUE)
+ require("epclust", quietly=TRUE)
+ synchrones <- bigmemory::attach.big.matrix(synchrones_desc)
+ counts <- bigmemory::attach.big.matrix(counts_desc)
+ medoids <- bigmemory::attach.big.matrix(medoids_desc)
+ m <- synchronicity::attach.mutex(m_desc)
+ }
+
ref_series = getRefSeries(indices)
nb_series = nrow(ref_series)
- #get medoids indices for this chunk of series
- #TODO: debug this (address is OK but values are garbage: why?)
-# mi = .Call("computeMedoidsIndices", medoids@address, ref_series, PACKAGE="epclust")
-
- #R-equivalent, requiring a matrix (thus potentially breaking "fit-in-memory" hope)
- mat_meds = medoids[,]
- mi = rep(NA,nb_series)
- for (i in 1:nb_series)
- mi[i] <- which.min( rowSums( sweep(mat_meds, 2, ref_series[i,], '-')^2 ) )
- rm(mat_meds); gc()
+ #get medoids indices for this chunk of series
+ mi = computeMedoidsIndices(medoids@address, ref_series)
for (i in seq_len(nb_series))
{
if (parll)
synchronicity::lock(m)
- synchrones[mi[i],] = synchrones[mi[i],] + ref_series[i,]
- counts[mi[i],1] = counts[mi[i],1] + 1
+ synchrones[, mi[i] ] = synchrones[, mi[i] ] + ref_series[,i]
+ counts[ mi[i] ] = counts[ mi[i] ] + 1 #TODO: remove counts? ...or as arg?!
if (parll)
synchronicity::unlock(m)
}
K = nrow(medoids) ; L = ncol(medoids)
# Use bigmemory (shared==TRUE by default) + synchronicity to fill synchrones in //
# TODO: if size > RAM (not our case), use file-backed big.matrix
- synchrones = bigmemory::big.matrix(nrow=K, ncol=L, type="double", init=0.)
+ synchrones = bigmemory::big.matrix(nrow=L, ncol=K, type="double", init=0.)
counts = bigmemory::big.matrix(nrow=K, ncol=1, type="double", init=0)
# synchronicity is only for Linux & MacOS; on Windows: run sequentially
parll = (requireNamespace("synchronicity",quietly=TRUE)
&& parll && Sys.info()['sysname'] != "Windows")
- if (parll)
- m <- synchronicity::boost.mutex()
-
if (parll)
{
+ m <- synchronicity::boost.mutex()
+ m_desc <- synchronicity::describe(m)
+ synchrones_desc = bigmemory::describe(synchrones)
+ counts_desc = bigmemory::describe(counts)
+ medoids_desc = bigmemory::describe(medoids)
cl = parallel::makeCluster(ncores_clust)
- parallel::clusterExport(cl,
- varlist=c("synchrones","counts","verbose","medoids","getRefSeries"),
- envir=environment())
+ parallel::clusterExport(cl, varlist=c("synchrones_desc","counts_desc","counts",
+ "verbose","m_desc","medoids_desc","getRefSeries"), envir=environment())
}
indices_workers = .spreadIndices(seq_len(nb_ref_curves), nb_series_per_chunk)
-#browser()
ignored <-
if (parll)
parallel::parLapply(cl, indices_workers, computeSynchronesChunk)
#TODO: can we avoid this loop? ( synchrones = sweep(synchrones, 1, counts, '/') )
for (i in seq_len(K))
- synchrones[i,] = synchrones[i,] / counts[i,1]
+ synchrones[,i] = synchrones[,i] / counts[i]
#NOTE: odds for some clusters to be empty? (when series already come from stage 2)
# ...maybe; but let's hope resulting K1' be still quite bigger than K2
- noNA_rows = sapply(seq_len(K), function(i) all(!is.nan(synchrones[i,])))
+ noNA_rows = sapply(seq_len(K), function(i) all(!is.nan(synchrones[,i])))
if (all(noNA_rows))
return (synchrones)
# Else: some clusters are empty, need to slice synchrones
- synchrones[noNA_rows,]
+ bigmemory::as.big.matrix(synchrones[,noNA_rows])
}
#' computeWerDists
#' @return A matrix of size K1 x K1
#'
#' @export
-computeWerDists = function(synchrones, ncores_clust=1,verbose=FALSE,parll=TRUE)
+computeWerDists = function(synchrones, nbytes,endian,ncores_clust=1,verbose=FALSE,parll=TRUE)
{
if (verbose)
cat(paste("--- Compute WER dists\n", sep=""))
#NOTE: default scalevector == 2^(0:(noctave * nvoice) / nvoice) * s0 (?)
scalevector <- 2^(4:(noctave * nvoice) / nvoice + 1)
#condition: ( log2(s0*w0/(2*pi)) - 1 ) * nvoice + 1.5 >= 1
- s0=2
- w0=2*pi
+ s0 = 2
+ w0 = 2*pi
scaled=FALSE
s0log = as.integer( (log2( s0*w0/(2*pi) ) - 1) * nvoice + 1.5 )
totnoct = noctave + as.integer(s0log/nvoice) + 1
Xwer_dist <- bigmemory::big.matrix(nrow=n, ncol=n, type="double")
- fcoefs = rep(1/3, 3) #moving average on 3 values
+
+ cwt_file = ".epclust_bin/cwt"
+ #TODO: args, nb_per_chunk, nbytes, endian
# Generate n(n-1)/2 pairs for WER distances computations
pairs = list()
pairs = c(pairs, lapply(V, function(v) c(i,v)))
}
- computeCWT = function(i)
+ computeSaveCWT = function(index)
{
- ts <- scale(ts(synchrones[i,]), center=TRUE, scale=scaled)
+ ts <- scale(ts(synchrones[index,]), center=TRUE, scale=scaled)
totts.cwt = Rwave::cwt(ts, totnoct, nvoice, w0, plot=FALSE)
ts.cwt = totts.cwt[,s0log:(s0log+noctave*nvoice)]
#Normalization
sqs <- sqrt(2^(0:(noctave*nvoice)/nvoice)*s0)
sqres <- sweep(ts.cwt,2,sqs,'*')
- sqres / max(Mod(sqres))
+ res <- sqres / max(Mod(sqres))
+ #TODO: serializer les CWT, les récupérer via getDataInFile ;
+ #--> OK, faut juste stocker comme séries simples de taille delta*ncol (53*17519)
+ binarize(c(as.double(Re(res)),as.double(Im(res))), cwt_file, ncol(res), ",", nbytes, endian)
+ }
+
+ if (parll)
+ {
+ cl = parallel::makeCluster(ncores_clust)
+ synchrones_desc <- bigmemory::describe(synchrones)
+ Xwer_dist_desc <- bigmemory::describe(Xwer_dist)
+ parallel::clusterExport(cl, varlist=c("synchrones_desc","Xwer_dist_desc","totnoct",
+ "nvoice","w0","s0log","noctave","s0","verbose","getCWT"), envir=environment())
+ }
+
+ #precompute and serialize all CWT
+ ignored <-
+ if (parll)
+ parallel::parLapply(cl, 1:n, computeSaveCWT)
+ else
+ lapply(1:n, computeSaveCWT)
+
+ getCWT = function(index)
+ {
+ #from cwt_file ...
+ res <- getDataInFile(c(2*index-1,2*index), cwt_file, nbytes, endian)
+ ###############TODO:
}
# Distance between rows i and j
computeDistancesIJ = function(pair)
{
+ if (parll)
+ {
+ require("bigmemory", quietly=TRUE)
+ require("epclust", quietly=TRUE)
+ synchrones <- bigmemory::attach.big.matrix(synchrones_desc)
+ Xwer_dist <- bigmemory::attach.big.matrix(Xwer_dist_desc)
+ }
+
i = pair[1] ; j = pair[2]
if (verbose && j==i+1)
cat(paste(" Distances (",i,",",j,"), (",i,",",j+1,") ...\n", sep=""))
- cwt_i = computeCWT(i)
- cwt_j = computeCWT(j)
- num <- .Call("filter", Mod(cwt_i * Conj(cwt_j)), PACKAGE="epclust")
- WX <- .Call("filter", Mod(cwt_i * Conj(cwt_i)), PACKAGE="epclust")
- WY <- .Call("filter", Mod(cwt_j * Conj(cwt_j)), PACKAGE="epclust")
+ cwt_i <- getCWT(i)
+ cwt_j <- getCWT(j)
+
+ num <- epclustFilter(Mod(cwt_i * Conj(cwt_j)))
+ WX <- epclustFilter(Mod(cwt_i * Conj(cwt_i)))
+ WY <- epclustFilter(Mod(cwt_j * Conj(cwt_j)))
wer2 <- sum(colSums(num)^2) / sum(colSums(WX) * colSums(WY))
- Xwer_dist[i,j] <- sqrt(delta * ncol(cwt_i) * (1 - wer2))
+ Xwer_dist[i,j] <- sqrt(delta * ncol(cwt_i) * max(1 - wer2, 0.)) #FIXME: wer2 should be < 1
Xwer_dist[j,i] <- Xwer_dist[i,j]
Xwer_dist[i,i] = 0.
}
- if (parll)
- {
- cl = parallel::makeCluster(ncores_clust)
- parallel::clusterExport(cl,
- varlist=c("synchrones","totnoct","nvoice","w0","s0log","noctave","s0","verbose"),
- envir=environment())
- }
-
ignored <-
if (parll)
parallel::parLapply(cl, pairs, computeDistancesIJ)
projects / epclust.git / blobdiff