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/*
* Copyright 1997, Regents of the University of Minnesota
*
* refine.c
*
* This file contains the driving routines for multilevel refinement
*
* Started 7/24/97
* George
*
* $Id: mrefine.c,v 1.2 1998/11/27 18:25:09 karypis Exp $
*/
#include <metis.h>
/*************************************************************************
* This function is the entry point of refinement
**************************************************************************/
void MocRefine2Way(CtrlType *ctrl, GraphType *orggraph, GraphType *graph, float *tpwgts, float ubfactor)
{
long i;
float tubvec[MAXNCON];
for (i=0; i<graph->ncon; i++)
tubvec[i] = 1.0;
IFSET(ctrl->dbglvl, DBG_TIME, starttimer(ctrl->UncoarsenTmr));
/* Compute the parameters of the coarsest graph */
MocCompute2WayPartitionParams(ctrl, graph);
for (;;) {
ASSERT(CheckBnd(graph));
IFSET(ctrl->dbglvl, DBG_TIME, starttimer(ctrl->RefTmr));
switch (ctrl->RType) {
case RTYPE_FM:
MocBalance2Way(ctrl, graph, tpwgts, 1.03);
MocFM_2WayEdgeRefine(ctrl, graph, tpwgts, 8);
break;
case 2:
MocBalance2Way(ctrl, graph, tpwgts, 1.03);
MocFM_2WayEdgeRefine2(ctrl, graph, tpwgts, tubvec, 8);
break;
default:
errexit("Unknown refinement type: %ld\n", ctrl->RType);
}
IFSET(ctrl->dbglvl, DBG_TIME, stoptimer(ctrl->RefTmr));
if (graph == orggraph)
break;
graph = graph->finer;
IFSET(ctrl->dbglvl, DBG_TIME, starttimer(ctrl->ProjectTmr));
MocProject2WayPartition(ctrl, graph);
IFSET(ctrl->dbglvl, DBG_TIME, stoptimer(ctrl->ProjectTmr));
}
MocBalance2Way(ctrl, graph, tpwgts, 1.01);
MocFM_2WayEdgeRefine(ctrl, graph, tpwgts, 8);
IFSET(ctrl->dbglvl, DBG_TIME, stoptimer(ctrl->UncoarsenTmr));
}
/*************************************************************************
* This function allocates memory for 2-way edge refinement
**************************************************************************/
void MocAllocate2WayPartitionMemory(CtrlType *ctrl, GraphType *graph)
{
long nvtxs, ncon;
nvtxs = graph->nvtxs;
ncon = graph->ncon;
graph->rdata = idxmalloc(5*nvtxs, "Allocate2WayPartitionMemory: rdata");
graph->where = graph->rdata;
graph->id = graph->rdata + nvtxs;
graph->ed = graph->rdata + 2*nvtxs;
graph->bndptr = graph->rdata + 3*nvtxs;
graph->bndind = graph->rdata + 4*nvtxs;
graph->npwgts = fmalloc(2*ncon, "npwgts");
}
/*************************************************************************
* This function computes the initial id/ed
**************************************************************************/
void MocCompute2WayPartitionParams(CtrlType *ctrl, GraphType *graph)
{
long i, j, k, l, nvtxs, ncon, nbnd, mincut;
idxtype *xadj, *adjncy, *adjwgt;
float *nvwgt, *npwgts;
idxtype *id, *ed, *where;
idxtype *bndptr, *bndind;
long me, other;
nvtxs = graph->nvtxs;
ncon = graph->ncon;
xadj = graph->xadj;
nvwgt = graph->nvwgt;
adjncy = graph->adjncy;
adjwgt = graph->adjwgt;
where = graph->where;
npwgts = sset(2*ncon, 0.0, graph->npwgts);
id = idxset(nvtxs, 0, graph->id);
ed = idxset(nvtxs, 0, graph->ed);
bndptr = idxset(nvtxs, -1, graph->bndptr);
bndind = graph->bndind;
/*------------------------------------------------------------
/ Compute now the id/ed degrees
/------------------------------------------------------------*/
nbnd = mincut = 0;
for (i=0; i<nvtxs; i++) {
ASSERT(where[i] >= 0 && where[i] <= 1);
me = where[i];
saxpy(ncon, 1.0, nvwgt+i*ncon, 1, npwgts+me*ncon, 1);
for (j=xadj[i]; j<xadj[i+1]; j++) {
if (me == where[adjncy[j]])
id[i] += adjwgt[j];
else
ed[i] += adjwgt[j];
}
if (ed[i] > 0 || xadj[i] == xadj[i+1]) {
mincut += ed[i];
bndptr[i] = nbnd;
bndind[nbnd++] = i;
}
}
graph->mincut = mincut/2;
graph->nbnd = nbnd;
}
/*************************************************************************
* This function projects a partition, and at the same time computes the
* parameters for refinement.
**************************************************************************/
void MocProject2WayPartition(CtrlType *ctrl, GraphType *graph)
{
long i, j, k, nvtxs, nbnd, me;
idxtype *xadj, *adjncy, *adjwgt, *adjwgtsum;
idxtype *cmap, *where, *id, *ed, *bndptr, *bndind;
idxtype *cwhere, *cid, *ced, *cbndptr;
GraphType *cgraph;
cgraph = graph->coarser;
cwhere = cgraph->where;
cid = cgraph->id;
ced = cgraph->ed;
cbndptr = cgraph->bndptr;
nvtxs = graph->nvtxs;
cmap = graph->cmap;
xadj = graph->xadj;
adjncy = graph->adjncy;
adjwgt = graph->adjwgt;
adjwgtsum = graph->adjwgtsum;
MocAllocate2WayPartitionMemory(ctrl, graph);
where = graph->where;
id = idxset(nvtxs, 0, graph->id);
ed = idxset(nvtxs, 0, graph->ed);
bndptr = idxset(nvtxs, -1, graph->bndptr);
bndind = graph->bndind;
/* Go through and project partition and compute id/ed for the nodes */
for (i=0; i<nvtxs; i++) {
k = cmap[i];
where[i] = cwhere[k];
cmap[i] = cbndptr[k];
}
for (nbnd=0, i=0; i<nvtxs; i++) {
me = where[i];
id[i] = adjwgtsum[i];
if (xadj[i] == xadj[i+1]) {
bndptr[i] = nbnd;
bndind[nbnd++] = i;
}
else {
if (cmap[i] != -1) { /* If it is an interface node. Note that cmap[i] = cbndptr[cmap[i]] */
for (j=xadj[i]; j<xadj[i+1]; j++) {
if (me != where[adjncy[j]])
ed[i] += adjwgt[j];
}
id[i] -= ed[i];
if (ed[i] > 0 || xadj[i] == xadj[i+1]) {
bndptr[i] = nbnd;
bndind[nbnd++] = i;
}
}
}
}
graph->mincut = cgraph->mincut;
graph->nbnd = nbnd;
scopy(2*graph->ncon, cgraph->npwgts, graph->npwgts);
FreeGraph(graph->coarser);
graph->coarser = NULL;
}
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