XLMWithLMHeadModel forwarding questions
## ❓ Questions & Help

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1. Why is the labels argument named 'labels' instead of 'masked_lm_labels' like in BertForMaskedLM?

2. When I change labels for masked tokens to -1 as suggested in documentation, I got an error from NLLLoss for label being outside valid num_classes range. When I instead change labels for masked tokens to -100 (default ignore_index), it seems to work. Why is this happening?
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