int main(int argc, char *argv[]) { ssize_t i, j, niter; params_t *params; gk_csr_t *mat; FILE *fpout; /* get command-line options */ params = parse_cmdline(argc, argv); /* read the data */ mat = gk_csr_Read(params->infile, GK_CSR_FMT_METIS, 1, 1); /* display some basic stats */ print_init_info(params, mat); if (params->ntvs != -1) { /* compute the pr for different randomly generated restart-distribution vectors */ float **prs; prs = gk_fAllocMatrix(params->ntvs, mat->nrows, 0.0, "main: prs"); /* generate the random restart vectors */ for (j=0; j<params->ntvs; j++) { for (i=0; i<mat->nrows; i++) prs[j][i] = RandomInRange(931); gk_fscale(mat->nrows, 1.0/gk_fsum(mat->nrows, prs[j], 1), prs[j], 1); niter = gk_rw_PageRank(mat, params->lamda, params->eps, params->niter, prs[j]); printf("tvs#: %zd; niters: %zd\n", j, niter); } /* output the computed pr scores */ fpout = gk_fopen(params->outfile, "w", "main: outfile"); for (i=0; i<mat->nrows; i++) { for (j=0; j<params->ntvs; j++) fprintf(fpout, "%.4e ", prs[j][i]); fprintf(fpout, "\n"); } gk_fclose(fpout); gk_fFreeMatrix(&prs, params->ntvs, mat->nrows); } else if (params->ppr != -1) { /* compute the personalized pr from the specified vertex */ float *pr; pr = gk_fsmalloc(mat->nrows, 0.0, "main: pr"); pr[params->ppr-1] = 1.0; niter = gk_rw_PageRank(mat, params->lamda, params->eps, params->niter, pr); printf("ppr: %d; niters: %zd\n", params->ppr, niter); /* output the computed pr scores */ fpout = gk_fopen(params->outfile, "w", "main: outfile"); for (i=0; i<mat->nrows; i++) fprintf(fpout, "%.4e\n", pr[i]); gk_fclose(fpout); gk_free((void **)&pr, LTERM); } else { /* compute the standard pr */ int jmax; float diff, maxdiff; float *pr; pr = gk_fsmalloc(mat->nrows, 1.0/mat->nrows, "main: pr"); niter = gk_rw_PageRank(mat, params->lamda, params->eps, params->niter, pr); printf("pr; niters: %zd\n", niter); /* output the computed pr scores */ fpout = gk_fopen(params->outfile, "w", "main: outfile"); for (i=0; i<mat->nrows; i++) { for (jmax=i, maxdiff=0.0, j=mat->rowptr[i]; j<mat->rowptr[i+1]; j++) { if ((diff = fabs(pr[i]-pr[mat->rowind[j]])) > maxdiff) { maxdiff = diff; jmax = mat->rowind[j]; } } fprintf(fpout, "%.4e %10zd %.4e %10d\n", pr[i], mat->rowptr[i+1]-mat->rowptr[i], maxdiff, jmax+1); } gk_fclose(fpout); gk_free((void **)&pr, LTERM); } gk_csr_Free(&mat); /* display some final stats */ print_final_info(params); }
/************************************************************************* * This function takes a graph and produces a bisection of it **************************************************************************/ idxtype MlevelRecursiveBisection(CtrlType *ctrl, GraphType *graph, idxtype nparts, idxtype *part, float *tpwgts, float ubfactor, idxtype fpart) { idxtype i, j, nvtxs, cut, tvwgt, tpwgts2[2]; idxtype *label, *where; GraphType lgraph, rgraph; float wsum; nvtxs = graph->nvtxs; if (nvtxs == 0) { mprintf("\t***Cannot bisect a graph with 0 vertices!\n\t***You are trying to partition a graph into too many parts!\n"); return 0; } /* Determine the weights of the partitions */ tvwgt = idxsum(nvtxs, graph->vwgt, 1); tpwgts2[0] = tvwgt*gk_fsum(nparts/2, tpwgts, 1); tpwgts2[1] = tvwgt-tpwgts2[0]; MlevelEdgeBisection(ctrl, graph, tpwgts2, ubfactor); cut = graph->mincut; /* mprintf("%5D %5D %5D [%5D %f]\n", tpwgts2[0], tpwgts2[1], cut, tvwgt, gk_fsum(nparts/2, tpwgts, 1));*/ label = graph->label; where = graph->where; for (i=0; i<nvtxs; i++) part[label[i]] = where[i] + fpart; if (nparts > 2) { SplitGraphPart(ctrl, graph, &lgraph, &rgraph); /* mprintf("%D %D\n", lgraph.nvtxs, rgraph.nvtxs); */ } /* Free the memory of the top level graph */ FreeGraph(graph, 0); /* Scale the fractions in the tpwgts according to the true weight */ wsum = gk_fsum(nparts/2, tpwgts, 1); gk_fscale(nparts/2, 1.0/wsum, tpwgts, 1); gk_fscale(nparts-nparts/2, 1.0/(1.0-wsum), tpwgts+nparts/2, 1); /* for (i=0; i<nparts; i++) mprintf("%5.3f ", tpwgts[i]); mprintf("[%5.3f]\n", wsum); */ /* Do the recursive call */ if (nparts > 3) { cut += MlevelRecursiveBisection(ctrl, &lgraph, nparts/2, part, tpwgts, ubfactor, fpart); cut += MlevelRecursiveBisection(ctrl, &rgraph, nparts-nparts/2, part, tpwgts+nparts/2, ubfactor, fpart+nparts/2); } else if (nparts == 3) { cut += MlevelRecursiveBisection(ctrl, &rgraph, nparts-nparts/2, part, tpwgts+nparts/2, ubfactor, fpart+nparts/2); FreeGraph(&lgraph, 0); } return cut; }