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This function is more accurate than torch.log() for small values of input - https://pytorch.org/docs/stable/generated/torch.log1p.html

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* make pad_between_seqs check do not consider padding at the end
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the current implementation would release the output of ln, leading to an error if setting `return_layernorm_output=True`.
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* WIP: fix get_swa_mask for padding
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* fix lint
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