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docs/source/en/model_doc/layoutxlm.md
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docs/source/en/model_doc/layoutxlm.md
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<!--Copyright 2021 The HuggingFace Team. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
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an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
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specific language governing permissions and limitations under the License.
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⚠️ Note that this file is in Markdown but contain specific syntax for our doc-builder (similar to MDX) that may not be
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rendered properly in your Markdown viewer.
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-->
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*This model was published in HF papers on 2021-04-18 and contributed to Hugging Face Transformers on 2021-11-03.*
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# LayoutXLM
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## Overview
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LayoutXLM was proposed in [LayoutXLM: Multimodal Pre-training for Multilingual Visually-rich Document Understanding](https://huggingface.co/papers/2104.08836) by Yiheng Xu, Tengchao Lv, Lei Cui, Guoxin Wang, Yijuan Lu, Dinei Florencio, Cha
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Zhang, Furu Wei. It's a multilingual extension of the [LayoutLMv2 model](https://huggingface.co/papers/2012.14740) trained
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on 53 languages.
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The abstract from the paper is the following:
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*Multimodal pre-training with text, layout, and image has achieved SOTA performance for visually-rich document
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understanding tasks recently, which demonstrates the great potential for joint learning across different modalities. In
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this paper, we present LayoutXLM, a multimodal pre-trained model for multilingual document understanding, which aims to
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bridge the language barriers for visually-rich document understanding. To accurately evaluate LayoutXLM, we also
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introduce a multilingual form understanding benchmark dataset named XFUN, which includes form understanding samples in
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7 languages (Chinese, Japanese, Spanish, French, Italian, German, Portuguese), and key-value pairs are manually labeled
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for each language. Experiment results show that the LayoutXLM model has significantly outperformed the existing SOTA
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cross-lingual pre-trained models on the XFUN dataset.*
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This model was contributed by [nielsr](https://huggingface.co/nielsr). The original code can be found [here](https://github.com/microsoft/unilm).
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## Usage tips and examples
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One can directly plug in the weights of LayoutXLM into a LayoutLMv2 model, like so:
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```python
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from transformers import LayoutLMv2Model
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model = LayoutLMv2Model.from_pretrained("microsoft/layoutxlm-base", device_map="auto")
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```
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Note that LayoutXLM has its own tokenizer, based on
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[`LayoutXLMTokenizer`]/[`LayoutXLMTokenizerFast`]. You can initialize it as
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follows:
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```python
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from transformers import LayoutXLMTokenizer
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tokenizer = LayoutXLMTokenizer.from_pretrained("microsoft/layoutxlm-base")
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```
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Similar to LayoutLMv2, you can use [`LayoutXLMProcessor`] (which internally applies
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[`LayoutLMv2ImageProcessor`] and
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[`LayoutXLMTokenizer`]/[`LayoutXLMTokenizerFast`] in sequence) to prepare all
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data for the model.
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<Tip>
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As LayoutXLM's architecture is equivalent to that of LayoutLMv2, one can refer to [LayoutLMv2's documentation page](layoutlmv2) for all tips, code examples and notebooks.
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</Tip>
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## LayoutXLMConfig
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[[autodoc]] LayoutXLMConfig
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## LayoutXLMTokenizer
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[[autodoc]] LayoutXLMTokenizer
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- __call__
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- build_inputs_with_special_tokens
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- get_special_tokens_mask
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- create_token_type_ids_from_sequences
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- save_vocabulary
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## LayoutXLMTokenizerFast
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[[autodoc]] LayoutXLMTokenizerFast
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- __call__
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## LayoutXLMProcessor
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[[autodoc]] LayoutXLMProcessor
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- __call__
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