mlp_pose and mlp_exp？

In the code of generator, `stage pose` uses `mlp_exp` and `stage exp` uses `mlp_pose`. Why so?

https://github.com/OpenTalker/DPE/blob/main/networks/generator.py#L134-L140
```
elif stage=='exp':
directions_expD = self.mlp_pose(directions_D)
```
```
elif stage=='pose':
directions_poseD = self.mlp_exp(directions_D)
```