feat: add C implementation for stats/base/ndarray/dmeankbn2
#2509
| Job | Run time |
|---|---|
| 3m 1s | |
| 3m 1s |
stats/base/ndarray/dmeankbn2
#2509
| Job | Run time |
|---|---|
| 3m 1s | |
| 3m 1s |