Error when training with very few examples

[ali asaria]

Loaded train dataset with 39 examples.
...
raise ValueError(f'Unknown split "{split}". Should be one of {list(name2len)}.')
ValueError: Unknown split "test". Should be one of ['train'].

I believe this happens when you have less than 100 examples. Warn users better about this error or prevent it in the first place.

[Tony Salomone]

I think this was unrelated to number of samples and is fixed now in main.