Add absorb for putting (part of) the contents of one tensor in another
#721
| Job | Run time |
|---|---|
| 2m 5s | |
| 2m 6s | |
| 2m 7s | |
| 1m 57s | |
| 2m 0s | |
| 2m 3s | |
| 1s | |
| 12m 19s |