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//------------------------------------------------------------------------------
// GraphBLAS/Demo/Program/kron_demo.c: Kronkecker product
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// Reads two graphs from two files and computes their Kronecker product,
// C = kron (A,B), writing the result to a file.
//
// kron_demo A.tsv B.tsv C.tsv
//
// Where A.tsv and B.tsv are two tab- or space-delimited triplet files with
// 1-based indices. Each line has the form:
//
// i j x
//
// where A(i,j)=x is performed by GrB_Matrix_build, to construct the matrix.
// The dimensions of A and B are assumed to be the largest row and column
// indices that appear in the files. The file C.tsv is the filename of the
// output file for C=kron(A,B), also with 1-based indices.
// macro used by OK(...) to free workspace if an error occurs
#define FREE_ALL \
GrB_Matrix_free (&A) ; \
GrB_Matrix_free (&B) ; \
GrB_Matrix_free (&C) ; \
if (Afile != NULL) fclose (Afile) ; \
if (Bfile != NULL) fclose (Bfile) ; \
if (Cfile != NULL) fclose (Cfile) ; \
if (I != NULL) free (I) ; \
if (J != NULL) free (J) ; \
if (X != NULL) free (X) ; \
GrB_finalize ( ) ;
#include "graphblas_demos.h"
int main (int argc, char **argv)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GrB_Matrix A = NULL, B = NULL, C = NULL ;
GrB_Index *I = NULL, *J = NULL ;
FILE *Afile = NULL, *Bfile = NULL, *Cfile = NULL ;
double *X = NULL ;
GrB_Info info ;
OK (GrB_init (GrB_NONBLOCKING)) ;
int nthreads ;
OK (GxB_Global_Option_get (GxB_GLOBAL_NTHREADS, &nthreads)) ;
fprintf (stderr, "kron demo: nthreads %d\n", nthreads) ;
// printf ("argc %d\n", argc) ;
if (argc != 4)
{
FREE_ALL ;
fprintf (stderr, "usage: kron_demo A.tsv B.tsv C.tsv\n") ;
exit (1) ;
}
Afile = fopen (argv [1], "r") ;
Bfile = fopen (argv [2], "r") ;
Cfile = fopen (argv [3], "w") ;
if (Afile == NULL || Bfile == NULL || Cfile == NULL)
{
FREE_ALL ;
fprintf (stderr, "unable to read input files or create output file\n") ;
exit (1) ;
}
//--------------------------------------------------------------------------
// get A and B from input files
//--------------------------------------------------------------------------
// this would be faster and take less memory if GraphBLAS had a built-in
// read-from-file operation
OK (read_matrix (&A, Afile, false, false, true, false, false)) ;
OK (read_matrix (&B, Bfile, false, false, true, false, false)) ;
fclose (Afile) ;
fclose (Bfile) ;
Afile = NULL ;
Bfile = NULL ;
GrB_Index anrows, ancols, bnrows, bncols, anvals, bnvals ;
OK (GrB_Matrix_nrows (&anrows, A)) ;
OK (GrB_Matrix_ncols (&ancols, A)) ;
OK (GrB_Matrix_nvals (&anvals, A)) ;
OK (GrB_Matrix_nrows (&bnrows, B)) ;
OK (GrB_Matrix_ncols (&bncols, B)) ;
OK (GrB_Matrix_nvals (&bnvals, B)) ;
//--------------------------------------------------------------------------
// C = kron (A,B)
//--------------------------------------------------------------------------
OK (GrB_Matrix_new (&C, GrB_FP64, anrows * bnrows, ancols * bncols)) ;
OK (GrB_Matrix_kronecker_BinaryOp (C, NULL, NULL,
GrB_TIMES_FP64, A, B, NULL)) ;
OK (GrB_Matrix_free (&A)) ;
OK (GrB_Matrix_free (&B)) ;
//--------------------------------------------------------------------------
// report results
//--------------------------------------------------------------------------
GrB_Index cnrows, cncols, cnvals ;
OK (GrB_Matrix_nrows (&cnrows, C)) ;
OK (GrB_Matrix_ncols (&cncols, C)) ;
OK (GrB_Matrix_nvals (&cnvals, C)) ;
// note that integers of type GrB_Index should be printed with the
// %PRIu64 format.
fprintf (stderr, "GraphBLAS GrB_kronecker:\n"
"A: %" PRIu64 "-by-%" PRIu64 ", %" PRIu64 " entries.\n"
"B: %" PRIu64 "-by-%" PRIu64 ", %" PRIu64 " entries.\n"
"C: %" PRIu64 "-by-%" PRIu64 ", %" PRIu64 " entries.\n",
anrows, ancols, anvals,
bnrows, bncols, bnvals,
cnrows, cncols, cnvals) ;
//--------------------------------------------------------------------------
// write C to the output file
//--------------------------------------------------------------------------
// this would be faster and take less memory if GraphBLAS had a built-in
// write-to-file operation
I = (GrB_Index *) malloc ((cnvals+1) * sizeof (GrB_Index)) ;
J = (GrB_Index *) malloc ((cnvals+1) * sizeof (GrB_Index)) ;
X = (double *) malloc ((cnvals+1) * sizeof (double )) ;
if (I == NULL || J == NULL || X == NULL)
{
fprintf (stderr, "out of memory\n") ;
FREE_ALL ;
exit (1) ;
}
OK (GrB_Matrix_extractTuples_FP64 (I, J, X, &cnvals, C)) ;
for (int64_t k = 0 ; k < cnvals ; k++)
{
fprintf (Cfile, "%" PRIu64 "\t%" PRIu64 "\t%.17g\n",
1 + I [k], 1 + J [k], X [k]) ;
}
FREE_ALL ;
return (0) ;
}
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