Use MtxLoader class to load graph or matrix data in .mtx format from disc. Loader allows configuration of parsing
mode, removing self-loops, doubling edges, offsetting indices and evaluation statistics for loaded data. Loader builds
adaptive vertices degree distribution histogram, so it is easier to investigate properties of a graph.
Example output of loading bcsstk33.mtx data from SuiteSparse Matrix Collection:
Loading matrix-market coordinate format data...
Reading from "./bcsstk33.mtx"
Matrix size 8738 rows, 8738 cols
Data: 300321 directed edges
Opt: remove self-loops
Opt: offset indices by -1
Opt: double edges
Reading data: ||||||||||||||||||||||||||||||||||| 100%
Parsed in 2.16565 sec 300334 lines
Calc stats in 0.003103 sec
Loaded in 2.1699 sec, 583166 edges total
deg: min 19, max 140, avg 66.7391, sd 16.1078
distribution:
[ 19 - 45): 9.6% *********
[ 45 - 54): 29% ****************************
[ 54 - 55): 0%
[ 55 - 56): 0.046%
[ 56 - 63): 7.7% *******
[ 63 - 79): 6.1% ******
[ 79 - 81): 45% *********************************************
[ 81 - 82): 0.011%
[ 82 - 83): 0.011%
[ 83 - 84): 0.08%
[ 84 - 85): 0%
[ 85 - 141): 2.4% **
Example output of loading hollywood-2009.mtx data from SuiteSparse Matrix Collection:
Loading matrix-market coordinate format data...
Reading from "./hollywood-2009.mtx"
Matrix size 1139905 rows, 1139905 cols
Data: 57515616 directed edges
Opt: remove self-loops
Opt: offset indices by -1
Opt: double edges
Reading data: ||||||||||||||||||||||||||||||||||| 100%
Parsed in 58.566 sec 57515664 lines
Calc stats in 0.086161 sec
Loaded in 58.654 sec, 112751422 edges total
deg: min 0, max 11467, avg 98.913, sd 271.865
distribution:
[ 0 - 3): 7.2% *******
[ 3 - 5): 4.6% ****
[ 5 - 7): 4.2% ****
[ 7 - 10): 6.5% ******
[ 10 - 13): 5.6% *****
[ 13 - 15): 3.6% ***
[ 15 - 19): 6.3% ******
[ 19 - 22): 4.3% ****
[ 22 - 26): 5% *****
[ 26 - 31): 5.4% *****
[ 31 - 37): 5.3% *****
[ 37 - 45): 5.7% *****
[ 45 - 54): 5% ****
[ 54 - 67): 5.2% *****
[ 67 - 86): 5% *****
[ 86 - 119): 5.2% *****
[ 119 - 187): 5.3% *****
[ 187 - 389): 5.2% *****
[ 389 - 11468): 5.3% *****