Question answering for SQuAD with XLNet
## ❓ Questions & Help

Dear huggingface,

Thank you very much for your great implementation of NLP architectures! I'm currently trying to train an XLNet model for question answering in French.

I studied your code to understand how question answering is done with XLNet, but I am struggling to follow how it works. Especially, I would like to understand the reasoning behind `PoolerStartLogits`, `PoolerStartLogits` and `PoolerAnswerClass`. 
I also don't quite understand how prediction of the answer indices works during inference time.

I know this is a lot of questions, I appreciate any help you can give me!

Thank you very much!

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