Confusion about the target_mapping parameter of the xlnet model
Why code at https://github.com/huggingface/transformers/blob/f75bf05ce6a05ef316363de129c29f2e00cacd7b/src/transformers/modeling_xlnet.py#L1029 is ` target_mapping[0, 0, -1] = 1.0`, i think it should be `  target_mapping[:, :, -1] = 1.0`

And I‘m confused about `taget_mapping` parameter, What is the difference between it and the `perm_mask` parameter?

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