fix loss normalization for ddp training

haoneng.lhn

2023-12-07 4152cf4615e234b9892703a8e088cdd51937fc13

1
2
3
4
5
6
7
8
9
i    1
ii    2
iii    3
iv    4
v    5
vi    6
vii    7
viii    8
ix    9