Obtaining large-scale annotated data for NLP tasks in the scientific domain is challenging and expensive. We release SCIBERT, a pretrained language model based on BERT (Devlin et al., 2019) to address the lack of high-quality, large-scale labeled scientific data.SCIBERT leverages unsupervised pretraining on a large multi-domain corpus of scientific publications to improve performance on downstream scientific NLP tasks. We evaluate on a suite of tasks including sequence tagging, sentence classification and dependency parsing, with datasets from a variety of scientific domains. We demonstrate statistically significant improvements over BERT and achieve new state-of-theart results on several of these tasks. The code and pretrained models are available at https://github.com/allenai/scibert/.

We introduce a new language representation model called BERT, which stands for Bidirectional Encoder Representations from Transformers. Unlike recent language representation models (Peters et al., 2018a;Radford et al., 2018), BERT is designed to pretrain deep bidirectional representations from unlabeled text by jointly conditioning on both left and right context in all layers. As a result, the pre-trained BERT model can be finetuned with just one additional output layer to create state-of-the-art models for a wide range of tasks, such as question answering and language inference, without substantial taskspecific architecture modifications.BERT is conceptually simple and empirically powerful. It obtains new state-of-the-art results on eleven natural language processing tasks, including pushing the GLUE score to 80.5% (7.7% point absolute improvement), MultiNLI accuracy to 86.7% (4.6% absolute improvement), SQuAD v1.1 question answering Test F1 to 93.2 (1.5 point absolute improvement) and SQuAD v2.0 Test F1 to 83.1 (5.1 point absolute improvement).

Motivation: Biomedical text mining is becoming increasingly important as the number of biomedical documents rapidly grows. With the progress in natural language processing (NLP), extracting valuable information from biomedical literature has gained popularity among researchers, and deep learning has boosted the development of effective biomedical text mining models. However, directly applying the advancements in NLP to biomedical text mining often yields unsatisfactory results due to a word distribution shift from general domain corpora to biomedical corpora. In this article, we investigate how the recently introduced pre-trained language model BERT can be adapted for biomedical corpora. Results: We introduce BioBERT (Bidirectional Encoder Representations from Transformers for Biomedical Text Mining), which is a domain-specific language representation model pre-trained on large-scale biomedical corpora. With almost the same architecture across tasks, BioBERT largely outperforms BERT and previous state-of-the-art models in a variety of biomedical text mining tasks when pre-trained on biomedical corpora. While BERT obtains performance comparable to that of previous state-of-the-art models, BioBERT significantly outperforms them on the following three representative biomedical text mining tasks: biomedical named entity recognition (0.62% F1 score improvement), biomedical relation extraction (2.80% F1 score improvement) and biomedical question answering (12.24% MRR improvement). Our analysis results show that pre-training BERT on biomedical corpora helps it to understand complex biomedical texts.

Neural models that do not rely on pre-training have excelled in the keyphrase generation task with large annotated datasets. Meanwhile, new approaches have incorporated pre-trained language models (PLMs) for their data efficiency. However, there lacks a systematic study of how the two types of approaches compare and how different design choices can affect the performance of PLM-based models. To fill in this knowledge gap and facilitate a more informed use of PLMs for keyphrase extraction and keyphrase generation, we present an in-depth empirical study. Formulating keyphrase extraction as sequence labeling and keyphrase generation as sequence-to-sequence generation, we perform extensive experiments in three domains. After showing that PLMs have competitive high-resource performance and state-of-the-art low-resource performance, we investigate important design choices including in-domain PLMs, PLMs with different pre-training objectives, using PLMs with a parameter budget, and different formulations for present keyphrases. Further results show that (1) in-domain BERT-like PLMs can be used to build strong and data-efficient keyphrase generation models; (2) with a fixed parameter budget, prioritizing model depth over width and allocating more layers in the encoder leads to better encoder-decoder models; and (3) introducing four in-domain PLMs, we achieve a competitive performance in the news domain and the state-of-the-art performance in the scientific domain.

虽然罕见疾病的特征在于患病率低，但大约3亿人受到罕见疾病的影响。对这些条件的早期和准确诊断是一般从业者的主要挑战，没有足够的知识来识别它们。除此之外，罕见疾病通常会显示各种表现形式，这可能会使诊断更加困难。延迟的诊断可能会对患者的生命产生负面影响。因此，迫切需要增加关于稀有疾病的科学和医学知识。自然语言处理（NLP）和深度学习可以帮助提取有关罕见疾病的相关信息，以促进其诊断和治疗。本文探讨了几种深度学习技术，例如双向长期内存（BILSTM）网络或基于来自变压器（BERT）的双向编码器表示的深层语境化词表示，以识别罕见疾病及其临床表现（症状和症状） Raredis语料库。该毒品含有超过5,000名罕见疾病和近6,000个临床表现。 Biobert，基于BERT和培训的生物医学Corpora培训的域特定语言表示，获得了最佳结果。特别是，该模型获得罕见疾病的F1分数为85.2％，表现优于所有其他模型。

Language models pretrained on text from a wide variety of sources form the foundation of today's NLP. In light of the success of these broad-coverage models, we investigate whether it is still helpful to tailor a pretrained model to the domain of a target task. We present a study across four domains (biomedical and computer science publications, news, and reviews) and eight classification tasks, showing that a second phase of pretraining indomain (domain-adaptive pretraining) leads to performance gains, under both high-and low-resource settings. Moreover, adapting to the task's unlabeled data (task-adaptive pretraining) improves performance even after domain-adaptive pretraining. Finally, we show that adapting to a task corpus augmented using simple data selection strategies is an effective alternative, especially when resources for domain-adaptive pretraining might be unavailable. Overall, we consistently find that multiphase adaptive pretraining offers large gains in task performance.

Neural language representation models such as BERT pre-trained on large-scale corpora can well capture rich semantic patterns from plain text, and be fine-tuned to consistently improve the performance of various NLP tasks. However, the existing pre-trained language models rarely consider incorporating knowledge graphs (KGs), which can provide rich structured knowledge facts for better language understanding. We argue that informative entities in KGs can enhance language representation with external knowledge. In this paper, we utilize both large-scale textual corpora and KGs to train an enhanced language representation model (ERNIE), which can take full advantage of lexical, syntactic, and knowledge information simultaneously. The experimental results have demonstrated that ERNIE achieves significant improvements on various knowledge-driven tasks, and meanwhile is comparable with the state-of-the-art model BERT on other common NLP tasks. The source code and experiment details of this paper can be obtained from https:// github.com/thunlp/ERNIE.

Contextualized representation models such as ELMo (Peters et al., 2018a) and BERT (Devlin et al., 2018) have recently achieved state-of-the-art results on a diverse array of downstream NLP tasks. Building on recent token-level probing work, we introduce a novel edge probing task design and construct a broad suite of sub-sentence tasks derived from the traditional structured NLP pipeline. We probe word-level contextual representations from four recent models and investigate how they encode sentence structure across a range of syntactic, semantic, local, and long-range phenomena. We find that existing models trained on language modeling and translation produce strong representations for syntactic phenomena, but only offer comparably small improvements on semantic tasks over a non-contextual baseline.

与标准命名实体识别（NER）相比，在历史文本中识别人，位置和组织是一个巨大的挑战。为了获得机器可读的语料库，通常需要扫描历史文本，并且需要执行光学特征识别（OCR）。结果，历史文献包含错误。此外，位置或组织等实体可以随着时间的推移而改变，这构成了另一个挑战。总体而言，历史文本带有几种特殊性，这些特殊性与现代文本有很大不同，并且在该领域几乎无法使用训练神经标记器的大型标记的Corpora。在这项工作中，我们通过培训大型历史语言模型来解决历史，英语，法语，瑞典语和芬兰语的历史文献。我们通过使用未标记的数据预处理语言模型来规避大量标记数据的需求。我们提出了Hmbert，这是一种历史多语言基于BERT的语言模型，并以多种不同大小的版本发布该模型。此外，我们通过解决下游NER作为今年HIPE-2022共享任务的一部分来评估HMBERT的能力，并提供详细的分析和见解。对于多种语言的经典评论粗粒ner挑战，我们的标记者Histeria的表现优于其他团队的三种语言中的其他团队的模型。

最近的工作表明，在适应新域时，域名语言模型可以提高性能。但是，与培训前提出的成本提出了一个重要问题：给出了固定预算，NLP从业者应该采取哪些步骤来最大限度地提高绩效？在本文中，我们在预算限制下研究域适应，并将其作为数据注释和预培训之间的客户选择问题。具体而言，我们测量三个程序文本数据集的注释成本以及三种域语言模型的预培训成本。然后，我们评估不同预算限制下的预训练和数据注释的不同组合的效用，以评估哪种组合策略最佳效果。我们发现，对于小预算，支出所有资金都会导致最佳表现;一旦预算变得足够大，数据注释和域内预训练的组合更优先。因此，我们建议任务特定的数据注释应该是在将NLP模型调整到新域时的经济策略的一部分。

与伯特（Bert）等语言模型相比，已证明知识增强语言表示的预培训模型在知识基础构建任务（即〜关系提取）中更有效。这些知识增强的语言模型将知识纳入预训练中，以生成实体或关系的表示。但是，现有方法通常用单独的嵌入表示每个实体。结果，这些方法难以代表播出的实体和大量参数，在其基础代币模型之上（即〜变压器），必须使用，并且可以处理的实体数量为由于内存限制，实践限制。此外，现有模型仍然难以同时代表实体和关系。为了解决这些问题，我们提出了一个新的预培训模型，该模型分别从图书中学习实体和关系的表示形式，并分别在文本中跨越跨度。通过使用SPAN模块有效地编码跨度，我们的模型可以代表实体及其关系，但所需的参数比现有模型更少。我们通过从Wikipedia中提取的知识图对我们的模型进行了预训练，并在广泛的监督和无监督的信息提取任务上进行了测试。结果表明，我们的模型比基线学习对实体和关系的表现更好，而在监督的设置中，微调我们的模型始终优于罗伯塔，并在信息提取任务上取得了竞争成果。

Transformer language models (TLMs) are critical for most NLP tasks, but they are difficult to create for low-resource languages because of how much pretraining data they require. In this work, we investigate two techniques for training monolingual TLMs in a low-resource setting: greatly reducing TLM size, and complementing the masked language modeling objective with two linguistically rich supervised tasks (part-of-speech tagging and dependency parsing). Results from 7 diverse languages indicate that our model, MicroBERT, is able to produce marked improvements in downstream task evaluations relative to a typical monolingual TLM pretraining approach. Specifically, we find that monolingual MicroBERT models achieve gains of up to 18% for parser LAS and 11% for NER F1 compared to a multilingual baseline, mBERT, while having less than 1% of its parameter count. We conclude reducing TLM parameter count and using labeled data for pretraining low-resource TLMs can yield large quality benefits and in some cases produce models that outperform multilingual approaches.

不良药物反应/事件（ADR / ADE）对患者健康和医疗费用产生重大影响。尽早检测ADR并与监管机构，制药公司和医疗保健提供者分享他们可以防止发病率并挽救许多生命。虽然大多数ADR都没有通过正式渠道报告，但它们通常在各种非结构化对话中记录，例如患者的社交媒体帖子，客户支持调用记录人或医疗保健提供者和制药商销售代表之间的会议注意事项。在本文中，我们提出了一种自然语言处理（NLP）解决方案，可在这种非结构化的自由文本对话中检测ADR，这在三种方面提高了先前的工作。首先，新的命名实体识别（NER）模型为ADR，CADEC和SMM4H基准数据集（分别为91.75％，78.76％和83.41％F1分数）获得新的最新的准确性）。其次，介绍了两个新的关系提取（RE）模型 - 基于Biobert，而另一个利用完全连接的神经网络（FCNN）的制作功能 - 显示与现有最先进的模型相提并论，在用补充诊所注释的RE DataSet培训时擅长它们。三是新的文本分类模型，用于决定对话是否包括ADR，在CADEC数据集中获得新的最先进的准确性（86.69％F1分数）。完整的解决方案在Apache Spark的顶部构建的生产级文库中实施了完整的解决方案，使其本身可扩展，并能够处理商品集群上的数百万批次或流媒体记录。

社会科学的学术文献是记录人类文明并研究人类社会问题的文献。随着这种文献的大规模增长，快速找到有关相关问题的现有研究的方法已成为对研究人员的紧迫需求。先前的研究，例如SCIBERT，已经表明，使用特定领域的文本进行预训练可以改善这些领域中自然语言处理任务的性能。但是，没有针对社会科学的预训练的语言模型，因此本文提出了关于社会科学引文指数（SSCI）期刊上许多摘要的预培训模型。这些模型可在GitHub（https://github.com/s-t-full-text-knowledge-mining/ssci-bert）上获得，在学科分类和带有社会科学文学的抽象结构 - 功能识别任务方面表现出色。

大型神经模型的培训和推断很昂贵。但是，对于许多应用程序域，虽然新任务和模型经常出现，但建模的基础文档主要保持不变。我们研究如何通过嵌入回收利用（ER）来降低此类设置的计算成本：在执行训练或推理时从以前的模型中重新使用激活。与以前的工作相反，重点是冻结小型分类头进行填充，这通常会导致绩效显着下降，我们提出了从预告片的模型中缓存中间层的输出，并为新任务的剩余层进行填充。我们表明，我们的方法在训练过程中提供了100％的速度和55-86％的推理，并且对科学领域中文本分类和实体识别任务的准确性产生了可观的影响。对于通用域的问答任务，ER提供了类似的加速和少量准确性。最后，我们确定了ER的几个开放挑战和未来的方向。

在这项工作中，我们探索如何学习专用的语言模型，旨在学习从文本文件中学习关键词的丰富表示。我们在判别和生成设置中进行预训练变压器语言模型（LMS）的不同掩蔽策略。在歧视性设定中，我们引入了一种新的预训练目标 - 关键边界，用替换（kbir）infifiling，在使用Kbir预先训练的LM进行微调时显示出在Sota上的性能（F1中高达9.26点）的大量增益关键酶提取的任务。在生成设置中，我们为BART - 键盘介绍了一个新的预训练设置，可再现与CATSeq格式中的输入文本相关的关键字，而不是Denoised原始输入。这也导致在关键词中的性能（F1 @ M）中的性能（高达4.33点），用于关键正版生成。此外，我们还微调了在命名实体识别（ner），问题应答（qa），关系提取（重新），抽象摘要和达到与SOTA的可比性表现的预训练的语言模型，表明学习丰富的代表关键词确实有利于许多其他基本的NLP任务。

动机：生物医学研究人员和临床从业者的常年挑战是随着出版物和医疗票据的快速增长而待的。自然语言处理（NLP）已成为驯服信息超载的有希望的方向。特别是，大型神经语言模型通过预先绘制的文本预测，通过各种NLP应用中的BERT模型的成功示例，便于通过预先绘制的预先来进行学习。然而，用于结束任务的微调此类模型仍然具有挑战性，特别是具有小标记数据集，这些数据集是生物医学NLP的常见。结果：我们对生物医学NLP的微调稳定性进行了系统研究。我们表明FineTuning性能可能对预先预订的设置敏感，尤其是在低资源域中。大型型号有可能获得更好的性能，但越来越多的模型大小也加剧了FineTuning不稳定性。因此，我们对解决微调不稳定的技术进行了全面的探索。我们表明，这些技术可以大大提高低源生物医学NLP应用的微调性能。具体地，冻结下层有助于标准伯特基型号，而完整的衰减对于BERT-LARD和Electra型号更有效。对于低资源文本相似性任务，如生物，重新初始化顶层是最佳策略。总体而言，占星型词汇和预制促进更强大的微调模型。基于这些调查结果，我们在广泛的生物医学NLP应用方面建立了新的技术。可用性和实施​​：为了促进生物医学NLP的进展，我们释放了我们最先进的预订和微调模型：https://aka.ms/blurb。

Contextual word representations derived from large-scale neural language models are successful across a diverse set of NLP tasks, suggesting that they encode useful and transferable features of language. To shed light on the linguistic knowledge they capture, we study the representations produced by several recent pretrained contextualizers (variants of ELMo, the OpenAI transformer language model, and BERT) with a suite of seventeen diverse probing tasks. We find that linear models trained on top of frozen contextual representations are competitive with state-of-the-art task-specific models in many cases, but fail on tasks requiring fine-grained linguistic knowledge (e.g., conjunct identification). To investigate the transferability of contextual word representations, we quantify differences in the transferability of individual layers within contextualizers, especially between recurrent neural networks (RNNs) and transformers. For instance, higher layers of RNNs are more taskspecific, while transformer layers do not exhibit the same monotonic trend. In addition, to better understand what makes contextual word representations transferable, we compare language model pretraining with eleven supervised pretraining tasks. For any given task, pretraining on a closely related task yields better performance than language model pretraining (which is better on average) when the pretraining dataset is fixed. However, language model pretraining on more data gives the best results.

在法律文本中预先培训的基于变压器的预训练语言模型（PLM）的出现，法律领域中的自然语言处理受益匪浅。有经过欧洲和美国法律文本的PLM，最著名的是Legalbert。但是，随着印度法律文件的NLP申请量的迅速增加以及印度法律文本的区别特征，也有必要在印度法律文本上预先培训LMS。在这项工作中，我们在大量的印度法律文件中介绍了基于变压器的PLM。我们还将这些PLM应用于印度法律文件的几个基准法律NLP任务，即从事实，法院判决的语义细分和法院判决预测中的法律法规识别。我们的实验证明了这项工作中开发的印度特定PLM的实用性。

预处理的多语言上下文表示表现出了巨大的成功，但是由于其预处理数据的限制，其好处并不适用于所有语言品种。这给这些模型不熟悉的语言品种带来了挑战，这些模型的标签\ emph {和未标记的}数据太限制了无法有效训练单语模型。我们建议使用其他特定于语言的预审进和词汇增强，以使多语言模型适应低资源设置。使用依赖性解析四种不同的低资源语言品种作为案例研究，我们表明，这些方法显着改善了基准的性能，尤其是在最低的资源案例中，并证明了此类模型的数据和目标之间关系的重要性语言品种。