Plot error in DUDL_ANN_multioutput

In file `DUDL_ANN_multioutput.ipynb` there is a error at session "plot the raw model outputs"

The following code:
```plt.plot(yHat.detach(),'s-',markerfacecolor='w')```

should be fixed with:
```plt.plot(sm(yHat.detach()),'s-',markerfacecolor='w')```
