GitLab

- Aurick noticed this bug and I ran into it yesterday
- after the fix, our cifar training shows same gain values from
  different replics now:

```
20-Oct-20 16:00:19 - DEBUG - rank1 - scale 2, gain ratio 1.3512124098087777
20-Oct-20 16:00:19 - DEBUG - rank0 - scale 2, gain ratio 1.3512124098087777
20-Oct-20 16:00:19 - DEBUG - rank1 - timing: data 0:00:00.000600 fwd 0:00:00.003678 loss 0:00:00.000086 bwd 0:00:00.314158 update 0:00:00.002132 rest 0:00:00.000399
20-Oct-20 16:00:19 - DEBUG - rank0 - timing: data 0:00:00.000643 fwd 0:00:00.003460 loss 0:00:00.000084 bwd 0:00:00.314678 update 0:00:00.002001 rest 0:00:00.000408
20-Oct-20 16:00:19 - DEBUG - rank1 - scale 2, gain ratio 1.3514997779980324
20-Oct-20 16:00:19 - DEBUG - rank0 - scale 2, gain ratio 1.3514997779980324
20-Oct-20 16:00:19 - DEBUG - rank1 - timing: data 0:00:00.000732 fwd 0:00:00.003689 loss 0:00:00.000086 bwd 0:00:00.314176 update 0:00:00.002146 rest 0:00:00.000397
20-Oct-20 16:00:19 - DEBUG - rank0 - timing: data 0:00:00.000646 fwd 0:00:00.003542 loss 0:00:00.000089 bwd 0:00:00.314549 update 0:00:00.001956 rest 0:00:00.000392
20-Oct-20 16:00:19 - DEBUG - rank1 - scale 2, gain ratio 1.352149646693932
20-Oct-20 16:00:19 - DEBUG - rank0 - scale 2, gain ratio 1.352149646693932
```