File: lmatch.c

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/*
 * Copyright 1997, Regents of the University of Minnesota
 *
 * coarsen.c
 *
 * This file contains code that finds a matching and performs the coarsening
 *
 * Started 2/22/96
 * George
 *
 * $Id: lmatch.c,v 1.2 2003/07/21 17:18:50 karypis Exp $
 *
 */

#include <parmetislib.h>


/*************************************************************************
* This function finds a HEM matching between local vertices only
**************************************************************************/
void Mc_LocalMatch_HEM(CtrlType *ctrl, GraphType *graph, WorkSpaceType *wspace)
{
  int h, i, ii, j, k;
  int nvtxs, ncon, cnvtxs, firstvtx, maxi, maxidx, edge; 
  idxtype *xadj, *ladjncy, *adjwgt, *vtxdist, *home, *myhome, *shome, *rhome;
  idxtype *perm, *match;
  float maxnvwgt, *nvwgt;

  graph->match_type = MATCH_LOCAL;
  maxnvwgt = 1.0/((float)(ctrl->nparts)*MAXVWGT_FACTOR);

  IFSET(ctrl->dbglvl, DBG_TIME, MPI_Barrier(ctrl->comm));
  IFSET(ctrl->dbglvl, DBG_TIME, starttimer(ctrl->MatchTmr));

  nvtxs = graph->nvtxs;
  ncon = graph->ncon;
  xadj = graph->xadj;
  nvwgt = graph->nvwgt;
  ladjncy = graph->adjncy;
  adjwgt = graph->adjwgt;
  home = graph->home;

  vtxdist = graph->vtxdist;
  firstvtx = vtxdist[ctrl->mype];

  match = graph->match = idxmalloc(nvtxs+graph->nrecv, "HEM_Match: match");
  myhome = idxsmalloc(nvtxs+graph->nrecv, UNMATCHED, "HEM_Match: myhome");

  idxset(nvtxs, UNMATCHED, match);
  idxset(graph->nrecv, 0, match+nvtxs);  /* Easy way to handle remote vertices */

  /*------------------------------------------------------------
  / Send/Receive the home information of interface vertices
  /------------------------------------------------------------*/
  if (ctrl->partType == ADAPTIVE_PARTITION || ctrl->partType == REFINE_PARTITION) {
    idxcopy(nvtxs, home, myhome);
    shome = wspace->indices;
    rhome = myhome + nvtxs;
    CommInterfaceData(ctrl, graph, myhome, shome, rhome);
  }

  /*************************************************************
   * Go now and find a local matching 
   *************************************************************/
  perm = wspace->indices;
  FastRandomPermute(nvtxs, perm, 1);
  cnvtxs = 0;
  for (ii=0; ii<nvtxs; ii++) {
    i = perm[ii];
    if (match[i] == UNMATCHED) {
      maxidx = maxi = -1;

      /* Find a heavy-edge matching, if the weight of the vertex is OK */
      for (h=0; h<ncon; h++)
        if (nvwgt[i*ncon+h] > maxnvwgt)
          break;

      if (h == ncon) {
        for (j=xadj[i]; j<xadj[i+1]; j++) {
          edge = ladjncy[j];

          /* match only with local vertices */
          if (myhome[edge] != myhome[i] || edge >= nvtxs)
            continue;

          for (h=0; h<ncon; h++)
            if (nvwgt[edge*ncon+h] > maxnvwgt) 
              break;

          if (h == ncon) {
            if (match[edge] == UNMATCHED &&
              (maxi == -1 ||
               adjwgt[maxi] < adjwgt[j] ||
              (adjwgt[maxi] == adjwgt[j] &&
               BetterVBalance(ncon,nvwgt+i*ncon,nvwgt+maxidx*ncon,nvwgt+edge*ncon) >= 0))) {
              maxi = j;
              maxidx = edge;
            }
          }
        }
      }

      if (maxi != -1) {
        k = ladjncy[maxi];
        if (i <= k) {
          match[i] = firstvtx+k + KEEP_BIT;
          match[k] = firstvtx+i;
        }
        else {
          match[i] = firstvtx+k;
          match[k] = firstvtx+i + KEEP_BIT;
        }
      }
      else {
        match[i] = (firstvtx+i) + KEEP_BIT;
      }
      cnvtxs++;
    }
  }

  CommInterfaceData(ctrl, graph, match, wspace->indices, match+nvtxs);
  GKfree((void **)(&myhome), LTERM);

#ifdef DEBUG_MATCH
  PrintVector2(ctrl, nvtxs, firstvtx, match, "Match1");
#endif


  if (ctrl->dbglvl&DBG_MATCHINFO) {
    PrintVector2(ctrl, nvtxs, firstvtx, match, "Match");
    myprintf(ctrl, "Cnvtxs: %d\n", cnvtxs);
    rprintf(ctrl, "Done with matching...\n");
  }

  IFSET(ctrl->dbglvl, DBG_TIME, MPI_Barrier(ctrl->comm));
  IFSET(ctrl->dbglvl, DBG_TIME, stoptimer(ctrl->MatchTmr));

  IFSET(ctrl->dbglvl, DBG_TIME, starttimer(ctrl->ContractTmr));
  Mc_Local_CreateCoarseGraph(ctrl, graph, wspace, cnvtxs);
  IFSET(ctrl->dbglvl, DBG_TIME, stoptimer(ctrl->ContractTmr));

}





/*************************************************************************
* This function creates the coarser graph
**************************************************************************/
void Mc_Local_CreateCoarseGraph(CtrlType *ctrl, GraphType *graph, WorkSpaceType *wspace, int cnvtxs)
{
  int h, i, j, k, l;
  int nvtxs, ncon, nedges, firstvtx, cfirstvtx;
  int npes=ctrl->npes, mype=ctrl->mype;
  int cnedges, v, u;
  idxtype *xadj, *vwgt, *vsize, *ladjncy, *adjwgt, *vtxdist, *where, *home;
  idxtype *match, *cmap;
  idxtype *cxadj, *cvwgt, *cvsize = NULL, *cadjncy, *cadjwgt, *cvtxdist, *chome = NULL, *cwhere = NULL;
  float *cnvwgt;
  GraphType *cgraph;
  int mask=(1<<13)-1, htable[8192], htableidx[8192];

  nvtxs = graph->nvtxs;
  ncon = graph->ncon;

  vtxdist = graph->vtxdist;
  xadj = graph->xadj;
  vwgt = graph->vwgt;
  home = graph->home;
  vsize = graph->vsize;
  ladjncy = graph->adjncy;
  adjwgt = graph->adjwgt;
  where = graph->where;
  match = graph->match;

  firstvtx = vtxdist[mype];

  cmap = graph->cmap = idxmalloc(nvtxs+graph->nrecv, "CreateCoarseGraph: cmap");

  /* Initialize the coarser graph */
  cgraph = CreateGraph();
  cgraph->nvtxs = cnvtxs;
  cgraph->level = graph->level+1;
  cgraph->ncon = ncon;

  cgraph->finer = graph;
  graph->coarser = cgraph;


  /*************************************************************
  * Obtain the vtxdist of the coarser graph 
  **************************************************************/
  cvtxdist = cgraph->vtxdist = idxmalloc(npes+1, "CreateCoarseGraph: cvtxdist");
  cvtxdist[npes] = cnvtxs;  /* Use last position in the cvtxdist as a temp buffer */

  MPI_Allgather((void *)(cvtxdist+npes), 1, IDX_DATATYPE, (void *)cvtxdist, 1, IDX_DATATYPE, ctrl->comm);

  MAKECSR(i, npes, cvtxdist);

  cgraph->gnvtxs = cvtxdist[npes];

#ifdef DEBUG_CONTRACT
  PrintVector(ctrl, npes+1, 0, cvtxdist, "cvtxdist");
#endif


  /*************************************************************
  * Construct the cmap vector 
  **************************************************************/
  cfirstvtx = cvtxdist[mype];

  /* Create the cmap of what you know so far locally */
  cnvtxs = 0;
  for (i=0; i<nvtxs; i++) {
    if (match[i] >= KEEP_BIT) {
      k = match[i] - KEEP_BIT;
      if (k<firstvtx+i)
        continue;  /* i has been matched via the (k,i) side */

      cmap[i] = cfirstvtx + cnvtxs++;
      if (k != firstvtx+i) {
        cmap[k-firstvtx] = cmap[i];
        match[k-firstvtx] += KEEP_BIT;  /* Add the KEEP_BIT to simplify coding */
      }
    }
  }

  CommInterfaceData(ctrl, graph, cmap, wspace->indices, cmap+nvtxs);


#ifdef DEBUG_CONTRACT
  PrintVector(ctrl, nvtxs, firstvtx, cmap, "Cmap");
#endif



  /*************************************************************
  * Finally, create the coarser graph
  **************************************************************/
  /* Allocate memory for the coarser graph, and fire up coarsening */
  cxadj = cgraph->xadj = idxmalloc(cnvtxs+1, "CreateCoarserGraph: cxadj");
  cvwgt = cgraph->vwgt = idxmalloc(cnvtxs*ncon, "CreateCoarserGraph: cvwgt");
  cnvwgt = cgraph->nvwgt = fmalloc(cnvtxs*ncon, "CreateCoarserGraph: cnvwgt");
  if (ctrl->partType == ADAPTIVE_PARTITION || ctrl->partType == REFINE_PARTITION)
    chome = cgraph->home = idxmalloc(cnvtxs, "CreateCoarserGraph: chome");
  if (vsize != NULL)
    cvsize = cgraph->vsize = idxmalloc(cnvtxs, "CreateCoarserGraph: cvsize");
  if (where != NULL)
    cwhere = cgraph->where = idxmalloc(cnvtxs, "CreateCoarserGraph: cwhere");
  cadjncy = idxmalloc(2*graph->nedges, "CreateCoarserGraph: cadjncy");
  cadjwgt = cadjncy+graph->nedges;

  iset(8192, -1, htable);

  cxadj[0] = cnvtxs = cnedges = 0;
  for (i=0; i<nvtxs; i++) {
    v = firstvtx+i; 
    u = match[i]-KEEP_BIT;

    if (v > u) 
      continue;  /* I have already collapsed it as (u,v) */

    /* Collapse the v vertex first, which you know that is local */
    for (h=0; h<ncon; h++)
      cvwgt[cnvtxs*ncon+h] = vwgt[i*ncon+h];
    if (ctrl->partType == ADAPTIVE_PARTITION || ctrl->partType == REFINE_PARTITION)
      chome[cnvtxs] = home[i];
    if (vsize != NULL)
      cvsize[cnvtxs] = vsize[i];
    if (where != NULL)
      cwhere[cnvtxs] = where[i];
    nedges = 0;

    for (j=xadj[i]; j<xadj[i+1]; j++) {
      k = cmap[ladjncy[j]];
      if (k != cfirstvtx+cnvtxs) {  /* If this is not an internal edge */
        l = k&mask;
        if (htable[l] == -1) { /* Seeing this for first time */
          htable[l] = k;
          htableidx[l] = cnedges+nedges;
          cadjncy[cnedges+nedges] = k; 
          cadjwgt[cnedges+nedges++] = adjwgt[j];
        }
        else if (htable[l] == k) {
          cadjwgt[htableidx[l]] += adjwgt[j];
        }
        else { /* Now you have to go and do a search. Expensive case */
          for (l=0; l<nedges; l++) {
            if (cadjncy[cnedges+l] == k)
              break;
          }
          if (l < nedges) {
            cadjwgt[cnedges+l] += adjwgt[j];
          }
          else {
            cadjncy[cnedges+nedges] = k; 
            cadjwgt[cnedges+nedges++] = adjwgt[j];
          }
        }
      }
    }

    /* Collapse the u vertex next */
    if (v != u) { 
      u -= firstvtx;
      for (h=0; h<ncon; h++)
        cvwgt[cnvtxs*ncon+h] += vwgt[u*ncon+h];
      if (vsize != NULL)
        cvsize[cnvtxs] += vsize[u];
      if (where != NULL && cwhere[cnvtxs] != where[u])
        myprintf(ctrl, "Something went wrong with the where local matching! %d %d\n", cwhere[cnvtxs], where[u]);

      for (j=xadj[u]; j<xadj[u+1]; j++) {
        k = cmap[ladjncy[j]];
        if (k != cfirstvtx+cnvtxs) {  /* If this is not an internal edge */
          l = k&mask;
          if (htable[l] == -1) { /* Seeing this for first time */
            htable[l] = k;
            htableidx[l] = cnedges+nedges;
            cadjncy[cnedges+nedges] = k; 
            cadjwgt[cnedges+nedges++] = adjwgt[j];
          }
          else if (htable[l] == k) {
            cadjwgt[htableidx[l]] += adjwgt[j];
          }
          else { /* Now you have to go and do a search. Expensive case */
            for (l=0; l<nedges; l++) {
              if (cadjncy[cnedges+l] == k)
                break;
            }
            if (l < nedges) {
              cadjwgt[cnedges+l] += adjwgt[j];
            }
            else {
              cadjncy[cnedges+nedges] = k; 
              cadjwgt[cnedges+nedges++] = adjwgt[j];
            }
          }
        }
      }
    }

    cnedges += nedges;
    for (j=cxadj[cnvtxs]; j<cnedges; j++)
      htable[cadjncy[j]&mask] = -1;  /* reset the htable */
    cxadj[++cnvtxs] = cnedges;
  }

  cgraph->nedges = cnedges;

  for (j=0; j<cnvtxs; j++)
    for (h=0; h<ncon; h++)
      cgraph->nvwgt[j*ncon+h] = (float)(cvwgt[j*ncon+h])/(float)(ctrl->tvwgts[h]);

  cgraph->adjncy = idxmalloc(cnedges, "CreateCoarserGraph: cadjncy");
  cgraph->adjwgt = idxmalloc(cnedges, "CreateCoarserGraph: cadjwgt");
  idxcopy(cnedges, cadjncy, cgraph->adjncy);
  idxcopy(cnedges, cadjwgt, cgraph->adjwgt);
  GKfree((void **)&cadjncy, (void **)&graph->where, LTERM); /* Note that graph->where works fine even if it is NULL */

}