update sparse computation, add initial version of BlockCSR and BlockELL
#700
| Job | Run time |
|---|---|
| 1m 36s | |
| 2m 50s | |
| 1m 35s | |
| 3m 36s | |
| 1m 44s | |
| 3m 5s | |
| 1m 34s | |
| 2m 30s | |
| 1m 42s | |
| 2m 19s | |
| 1m 34s | |
| 1m 37s | |
| 25m 42s |