/*************************************************************************
* This function finds a matching using the HEM heuristic
**************************************************************************/
void Match_HEM(CtrlType *ctrl, GraphType *graph)
{
int i, ii, j, k, nvtxs, cnvtxs, maxidx, dim;
idxtype *xadj, *vwgt, *adjncy;
idxtype *match, *cmap, *perm, *tperm;
realtype curwgt, maxwgt;
realtype *vvol, *vsurf, *adjwgt, *adjwgtsum;
dim = ctrl->dim;
nvtxs = graph->nvtxs;
xadj = graph->xadj;
vwgt = graph->vwgt;
vvol = graph->vvol;
vsurf = graph->vsurf;
adjncy = graph->adjncy;
adjwgt = graph->adjwgt;
adjwgtsum = graph->adjwgtsum;
cmap = graph->cmap = idxsmalloc(nvtxs, -1, "cmap");
match = idxsmalloc(nvtxs, -1, "match");
perm = idxmalloc(nvtxs, "perm");
tperm = idxmalloc(nvtxs, "tperm");
RandomPermute(nvtxs, tperm, 1);
BucketSortKeysInc(nvtxs, vwgt[iamax(nvtxs, vwgt)], vwgt, tperm, perm);
/* RandomPermute(nvtxs, perm, 1); */
cnvtxs = 0;
/* Compute a heavy-edge style matching giving preferance to small vertices */
for (ii=0; ii<nvtxs; ii++) {
i = perm[ii];
if (match[i] == UNMATCHED) {
maxidx = i;
maxwgt = 0.0;
/* Find a heavy-edge matching, subject to maxvwgt constraints */
for (j=xadj[i]; j<xadj[i+1]; j++) {
k = adjncy[j];
curwgt = 1.0/ARATIO2(dim, vsurf[i]+vsurf[k]+adjwgtsum[i]+adjwgtsum[k]-
2.0*adjwgt[j], vvol[i]+vvol[k]);
if (match[k] == UNMATCHED && vwgt[i]+vwgt[k] <= ctrl->maxsize &&
curwgt > maxwgt) {
maxwgt = curwgt;
maxidx = k;
}
}
cmap[i] = cmap[maxidx] = cnvtxs++;
match[i] = maxidx;
match[maxidx] = i;
}
}
CreateCoarseGraph(graph, cnvtxs, match, perm);
IMfree((void**)&tperm, &perm, &match, LTERM);
}
void GrowKWayPartitioning(ctrl_t *ctrl, graph_t *graph)
{
idx_t v, i, ii, j, nvtxs, nparts, nmis, minvwgt;
idx_t *xadj, *adjncy, *vwgt, *adjwgt;
idx_t *where, *pwgts, *minwgt, *maxwgt, *nbrwgt;
idx_t *perm;
real_t ubfactor_original;
WCOREPUSH;
nvtxs = graph->nvtxs;
xadj = graph->xadj;
adjncy = graph->adjncy;
adjwgt = graph->adjwgt;
vwgt = graph->vwgt;
where = graph->where;
pwgts = graph->pwgts;
nparts = ctrl->nparts;
/* setup the weight intervals of the various subdomains */
minwgt = iwspacemalloc(ctrl, nparts);
maxwgt = iwspacemalloc(ctrl, nparts);
for (i=0; i<nparts; i++) {
maxwgt[i] = ctrl->tpwgts[i]*graph->tvwgt[0]*ctrl->ubfactors[0];
minwgt[i] = ctrl->tpwgts[i]*graph->tvwgt[0]*(1.0/ctrl->ubfactors[0]);
}
/* setup the initial state of the partitioning */
iset(nvtxs, nparts, where);
iset(nparts, 0, pwgts);
perm = iwspacemalloc(ctrl, nvtxs);
/* compute the weights of the neighborhood */
nbrwgt = iwspacemalloc(ctrl, nvtxs);
/*
for (i=0; i<nvtxs; i++) {
nbrwgt[i] = vwgt[i];
for (j=xadj[i]; j<xadj[i+1]; j++) {
ii = adjncy[j];
nbrwgt[i] += vwgt[ii]/log2(2+xadj[ii+1]-xadj[ii]);
}
}
*/
for (i=0; i<nvtxs; i++) {
nbrwgt[i] = 0;
for (j=xadj[i]; j<xadj[i+1]; j++)
nbrwgt[i] += adjwgt[j];
}
minvwgt = isum(nvtxs, nbrwgt, 1)/nvtxs;
#ifdef XXX
perm = iwspacemalloc(ctrl, nvtxs);
tperm = iwspacemalloc(ctrl, nvtxs);
degrees = iwspacemalloc(ctrl, nvtxs);
irandArrayPermute(nvtxs, tperm, nvtxs, 1);
irandArrayPermute(nvtxs, tperm, nvtxs, 0);
avgdegree = 1.0*(xadj[nvtxs]/nvtxs);
for (i=0; i<nvtxs; i++) {
bnum = sqrt(1+xadj[i+1]-xadj[i]);
degrees[i] = (bnum > avgdegree ? avgdegree : bnum);
}
BucketSortKeysInc(ctrl, nvtxs, avgdegree, degrees, tperm, perm);
#endif
ubfactor_original = ctrl->ubfactors[0];
ctrl->ubfactors[0] = 1.05*ubfactor_original;
/* find an MIS of vertices by randomly traversing the vertices and assign them to
the different partitions */
irandArrayPermute(nvtxs, perm, nvtxs, 1);
for (nmis=0, ii=0; ii<nvtxs; ii++) {
i=perm[ii];
if (nbrwgt[i] < minvwgt)
continue;
if (where[i] == nparts) {
pwgts[nmis] = vwgt[i];
where[i] = nmis++;
/* mark first level neighbors */
for (j=xadj[i]; j<xadj[i+1]; j++) {
v = adjncy[j];
if (where[v] == nparts)
where[v] = nparts+1;
}
}
if (nmis == nparts)
break;
}
printf(" nvtxs: %"PRIDX", nmis: %"PRIDX", minvwgt: %"PRIDX", ii: %"PRIDX"\n", nvtxs, nmis, minvwgt, ii);
/* if the size of the MIS is not sufficiently large, go and find some additional seeds */
if (nmis < nparts) {
minvwgt = .75*minvwgt;
irandArrayPermute(nvtxs, perm, nvtxs, 0);
for (ii=0; ii<nvtxs; ii++) {
i=perm[ii];
if (nbrwgt[i] < minvwgt)
continue;
if (where[i] == nparts) {
pwgts[nmis] = vwgt[i];
where[i] = nmis++;
/* mark first level neighbors */
for (j=xadj[i]; j<xadj[i+1]; j++) {
v = adjncy[j];
if (where[v] == nparts)
where[v] = nparts+1;
}
}
if (nmis == nparts)
break;
}
printf(" nvtxs: %"PRIDX", nmis: %"PRIDX"\n", nvtxs, nmis);
}
/* if the size of the MIS is not sufficiently large, go and find some additional seeds */
if (nmis < nparts) {
irandArrayPermute(nvtxs, perm, nvtxs, 0);
for (ii=0; ii<nvtxs; ii++) {
i = perm[ii];
if (where[i] == nparts+1) {
pwgts[nmis] = vwgt[i];
where[i] = nmis++;
}
if (nmis == nparts)
break;
}
printf(" nvtxs: %"PRIDX", nmis: %"PRIDX"\n", nvtxs, nmis);
}
/* set all unassigned vertices to 'nparts' */
for (i=0; i<nvtxs; i++) {
if (where[i] >= nparts)
where[i] = nparts;
}
WCOREPOP;
/* refine the partition */
ComputeKWayPartitionParams(ctrl, graph);
if (ctrl->minconn)
EliminateSubDomainEdges(ctrl, graph);
for (i=0; i<4; i++) {
ComputeKWayBoundary(ctrl, graph, BNDTYPE_BALANCE);
Greedy_KWayOptimize(ctrl, graph, 10, 0, OMODE_BALANCE);
/*
for (k=0; k<nparts; k++)
printf("%"PRIDX"\n", graph->pwgts[k]);
exit(0);
*/
ComputeKWayBoundary(ctrl, graph, BNDTYPE_REFINE);
Greedy_KWayOptimize(ctrl, graph, ctrl->niter, 1, OMODE_REFINE);
Greedy_KWayEdgeCutOptimize(ctrl, graph, ctrl->niter);
}
ctrl->ubfactors[0] = ubfactor_original;
}
/*************************************************************************
* This function finds a matching using the HEM heuristic
**************************************************************************/
void Match_SHEM(CtrlType *ctrl, GraphType *graph)
{
int i, ii, j, k, nvtxs, cnvtxs, maxidx, maxwgt, avgdegree;
idxtype *xadj, *vwgt, *adjncy, *adjwgt;
idxtype *match, *cmap, *degrees, *perm, *tperm;
IFSET(ctrl->dbglvl, DBG_TIME, starttimer(ctrl->MatchTmr));
nvtxs = graph->nvtxs;
xadj = graph->xadj;
vwgt = graph->vwgt;
adjncy = graph->adjncy;
adjwgt = graph->adjwgt;
cmap = graph->cmap;
match = idxset(nvtxs, UNMATCHED, idxwspacemalloc(ctrl, nvtxs));
perm = idxwspacemalloc(ctrl, nvtxs);
tperm = idxwspacemalloc(ctrl, nvtxs);
degrees = idxwspacemalloc(ctrl, nvtxs);
RandomPermute(nvtxs, tperm, 1);
avgdegree = 0.7*(xadj[nvtxs]/nvtxs);
for (i=0; i<nvtxs; i++)
degrees[i] = (xadj[i+1]-xadj[i] > avgdegree ? avgdegree : xadj[i+1]-xadj[i]);
BucketSortKeysInc(nvtxs, avgdegree, degrees, tperm, perm);
cnvtxs = 0;
/* Take care any islands. Islands are matched with non-islands due to coarsening */
for (ii=0; ii<nvtxs; ii++) {
i = perm[ii];
if (match[i] == UNMATCHED) { /* Unmatched */
if (xadj[i] < xadj[i+1])
break;
maxidx = i;
for (j=nvtxs-1; j>ii; j--) {
k = perm[j];
if (match[k] == UNMATCHED && xadj[k] < xadj[k+1]) {
maxidx = k;
break;
}
}
cmap[i] = cmap[maxidx] = cnvtxs++;
match[i] = maxidx;
match[maxidx] = i;
}
}
/* Continue with normal matching */
for (; ii<nvtxs; ii++) {
i = perm[ii];
if (match[i] == UNMATCHED) { /* Unmatched */
maxidx = i;
maxwgt = 0;
/* Find a heavy-edge matching, subject to maxvwgt constraints */
for (j=xadj[i]; j<xadj[i+1]; j++) {
if (match[adjncy[j]] == UNMATCHED && maxwgt < adjwgt[j] && vwgt[i]+vwgt[adjncy[j]] <= ctrl->maxvwgt) {
maxwgt = adjwgt[j];
maxidx = adjncy[j];
}
}
cmap[i] = cmap[maxidx] = cnvtxs++;
match[i] = maxidx;
match[maxidx] = i;
}
}
IFSET(ctrl->dbglvl, DBG_TIME, stoptimer(ctrl->MatchTmr));
idxwspacefree(ctrl, nvtxs); /* degrees */
idxwspacefree(ctrl, nvtxs); /* tperm */
CreateCoarseGraph(ctrl, graph, cnvtxs, match, perm);
idxwspacefree(ctrl, nvtxs);
idxwspacefree(ctrl, nvtxs);
}
/*************************************************************************
* This function finds a matching using the HEM heuristic
**************************************************************************/
void MCMatch_SBHEM(CtrlType *ctrl, GraphType *graph, int norm)
{
int i, ii, j, k, nvtxs, cnvtxs, ncon, maxidx, maxwgt, avgdegree;
idxtype *xadj, *adjncy, *adjwgt;
idxtype *match, *cmap, *degrees, *perm, *tperm;
float *nvwgt, vbal;
IFSET(ctrl->dbglvl, DBG_TIME, starttimer(ctrl->MatchTmr));
nvtxs = graph->nvtxs;
ncon = graph->ncon;
xadj = graph->xadj;
nvwgt = graph->nvwgt;
adjncy = graph->adjncy;
adjwgt = graph->adjwgt;
cmap = graph->cmap;
match = idxset(nvtxs, UNMATCHED, idxwspacemalloc(ctrl, nvtxs));
perm = idxwspacemalloc(ctrl, nvtxs);
tperm = idxwspacemalloc(ctrl, nvtxs);
degrees = idxwspacemalloc(ctrl, nvtxs);
RandomPermute(nvtxs, tperm, 1);
avgdegree = (int)(0.7*(xadj[nvtxs]/nvtxs));
for (i=0; i<nvtxs; i++)
degrees[i] = (xadj[i+1]-xadj[i] > avgdegree ? avgdegree : xadj[i+1]-xadj[i]);
BucketSortKeysInc(nvtxs, avgdegree, degrees, tperm, perm);
cnvtxs = 0;
/* Take care any islands. Islands are matched with non-islands due to coarsening */
for (ii=0; ii<nvtxs; ii++) {
i = perm[ii];
if (match[i] == UNMATCHED) { /* Unmatched */
if (xadj[i] < xadj[i+1])
break;
maxidx = i;
for (j=nvtxs-1; j>ii; j--) {
k = perm[j];
if (match[k] == UNMATCHED && xadj[k] < xadj[k+1]) {
maxidx = k;
break;
}
}
cmap[i] = cmap[maxidx] = cnvtxs++;
match[i] = maxidx;
match[maxidx] = i;
}
}
/* Continue with normal matching */
for (; ii<nvtxs; ii++) {
i = perm[ii];
if (match[i] == UNMATCHED) { /* Unmatched */
maxidx = i;
maxwgt = -1;
vbal = 0.0;
/* Find a heavy-edge matching, subject to maxvwgt constraints */
for (j=xadj[i]; j<xadj[i+1]; j++) {
k = adjncy[j];
if (match[k] == UNMATCHED && AreAllVwgtsBelowFast(ncon, nvwgt+i*ncon, nvwgt+k*ncon, ctrl->nmaxvwgt)) {
if (maxidx != i)
vbal = BetterVBalance(ncon, norm, nvwgt+i*ncon, nvwgt+maxidx*ncon, nvwgt+k*ncon);
if (vbal > 0 || (vbal > -.01 && maxwgt < adjwgt[j])) {
maxwgt = adjwgt[j];
maxidx = k;
}
}
}
cmap[i] = cmap[maxidx] = cnvtxs++;
match[i] = maxidx;
match[maxidx] = i;
}
}
IFSET(ctrl->dbglvl, DBG_TIME, stoptimer(ctrl->MatchTmr));
idxwspacefree(ctrl, nvtxs); /* degrees */
idxwspacefree(ctrl, nvtxs); /* tperm */
CreateCoarseGraph(ctrl, graph, cnvtxs, match, perm);
idxwspacefree(ctrl, nvtxs);
idxwspacefree(ctrl, nvtxs);
}
