updates for keras_core / multi-backend support
#402
| Job | Run time |
|---|---|
| 6m 45s | |
| 13m 36s | |
| 9m 55s | |
| 13m 54s | |
| 14m 33s | |
| 10m 45s | |
| 6m 51s | |
| 10m 37s | |
| 2m 35s | |
| 7m 58s | |
| 7m 42s | |
| 6m 25s | |
| 7m 36s | |
| 8m 0s | |
| 2h 7m 12s |