Add absorb for putting (part of) the contents of one tensor in another
#722
| Job | Run time |
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| 40m 12s | |
| 16m 8s | |
| 57m 34s | |
| 34m 39s | |
| 33m 43s | |
| 57m 43s | |
| 1s | |
| 4h 0m 0s |