Is it possible to make `validation_step` and `val_dataloader` no-ops? about lightning HOT 5 CLOSED

live on master now

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great idea. val call can just be made optional! very easy to do.

do you want to give it a shot?

1. remove notimplemented warning. add pass instead. (from validation_step)
2. allow get val_dataloader to be none.
3. in val loop check if val_loader is none (at very beginning). return if it is none.

from lightning.

Thanks, I'll take a stab at that this weekend!

from lightning.

Dang, too fast for me :) Thanks for working on this!

from lightning.

Sorry for writing to this thread but how can I use it in my model? Is it enough to do something like:

@pl.data_loader
def val_dataloader(self):
     if has_valset:        
        return self.__dataloader(train=False)
    
    # No validation set
    return None

After that do I need to do something like:

def validation_step(self, batch, batch_idx):
    # Is this check necessary?
    if not has_vaset:
        return
   
   # process the validation batch

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