updates for keras_core / multi-backend support
#409
| Job | Run time |
|---|---|
| 10m 47s | |
| 17m 38s | |
| 12m 25s | |
| 16m 41s | |
| 9m 16s | |
| 14m 46s | |
| 10m 55s | |
| 6m 37s | |
| 2m 3s | |
| 11m 8s | |
| 10m 27s | |
| 12m 35s | |
| 9m 32s | |
| 11m 26s | |
| 2h 36m 16s |