no able to add abstract methods to class

[Fan-Luo]

Hi,
I got an error with pytorch_lightning when splitting configure_optimizers and training_step functions in different cells from the definition of myclass, which is inherited from pl.LightningModule. If configure_optimizers and training_step functions are merged into the cell where the def of the class is, the error disappears, but not with %%add_to myclass.

TypeError: Can't instantiate abstract class myclass with abstract methods configure_optimizers, training_step

By the way, thank you for developing this great tool!