LayoutLMv2ForRelationExtraction is missing in transformers

[binkjakub]

Feature request

Microsoft's unilim repository, which originally implements all LayoutLM models, contains implementation of the model for relation extraction with Biaffine Attention Classifier, namely LayoutLMv2ForRelationExtraction. However, this class wasn't included in transfromers, due to unknown reasons. Therefore, the implementation for relation extraction LayoutLMv2ForRelationExtraction should be included to extend current LayoutLMv2 and LayoutXLM.

Motivation

This repository should implement all tasks included in papers (LayoutLMv2, LayoutXLM) and unilim repository, thus this missing part should be added to transformers. It would enable users to easily reproduce entire paper as well as convenient use of relation extraction in their downstream applications.

Your contribution

If there are no obstacles unknown to me, I could try to move the implementation from unilim to transformers.

[LysandreJik]

cc @NielsRogge

[sijunhe]

+1 to this

[github-actions]

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