evaluation for duplicated answer choices

[KonstantinHebenstreit]

In datasets are sometimes examples with 4 or 5 answer choices. I think what has been done is just to duplicate one of the answer choices to always have 5 choices.
The evaluation script does not include this option.
Since we put letters in front of the choices (A,B,C,D,E), the model can also answer with a letter. But if the right choice it as two places it has two letters. This can lead to wrong evaluation scores based on the letters.

First example is commonsense_qa, but there might be others.

[KonstantinHebenstreit]

Helper code to find those examples:

coll["commonsense_qa"].filter(lambda example: len(set(example["choices"]))==4)