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roberta 是bert 的一个完善版,相对于模型架构之类的都没有改变,改变的只是三个方面: 预训练数据: BERT采用了BOOKCORPUS 和英文维基百科, 总共16GB。 而 RoBERTa采用了BOOKCORPUS + 英文维基百科+ CC-NEWS+OPENWEBTEXT+STORIES, 总共160GB。 Roberta’s is a neighborhood institution, culinary destination, hub for innovative entrepreneurship, and now a global empire with a variety of locations worldwide. 论文题目:RoBERTa: A Robustly Optimized BERT Pretraining Approach 作者单位:华盛顿大学保罗·艾伦计算机科学与工程学院,FaceBook AI 这篇文章是 BERT 系列模型和 XLNet 模型的又一次交锋,是 FaceBook 与 Go…

RoBERTa:每次给模型看这句话的时候,才 临时、随机地 选择一些词进行 Mask。 这意味着模型每次看到的同一句话,要填的“空”都可能不一样。 更大规模 更多的训练数据:BERT 使用了大约 16GB 的文本数据,RoBERTa 使用了高达 160GB 的文本数据,是 BERT 的十倍。 Roberta, or “robustly optimized bert approach,” is essentially an upgraded version of bert, with a few key tweaks that make it stronger and more capable. RoBERTa认为BERT的符号化粒度还是过大,无法克服很多稀有词汇容易产生“OOV”的问题。 为了解决上述问题,RoBERTa借鉴了GPT-2.0的做法,使用力度更小的 字节级BPE (byte-level BPE)进行输入的符号化表示和词典构造,从而词典的规模增加至大约5万。

Roberta由于没有NSP任务也就是句子对分类任务,因此应该他们训练的时候是没有这部分权重的。 我查看了roberta官方权重,发现进行MLM训练时候是没有pooler output部分的权重,可能huggingface为了方便进行下游句子级别的文本分类任务,他们自己随机初始化了这个pooler.

Roberta为什么不需要token_type_ids? 在Bert和Albert预训练模型中,token_type_ids值为0或1来区分token属于第一句还是第二句,为什么Roberta里不需要呢? 在没有进行模型训练(类似于现在主流大模型的微调)之前,RoBERTa 的语义分析能力约等于 0,accuracy=0.5 和随机猜测相差无几。 在 Transformer 出现之前,序列建模主要依赖循环神经网络(RNN)及其改进版本 LSTM 和 GRU,它们通过递归结构逐步处理序列,适用于语言建模、机器翻译等任务,但在处理长距离依赖时常受限于梯度消失和计算效率问题。为增强模型对不同输入位置的关注能力,Bahdanau 等人于 2015 年首次… 英文领域: deberta v3:微软开源的模型,在许多任务上超过了bert和roberta,现在kaggle中比较常用此模型打比赛,也侧面反映了deberta v3的效果是最好的。 ernie 2.0:这个百度是只开源了英文版,我试过比roberta略好。

2 理论方法 本文建立了 RoBERTa-BiLSTM-CRF 模型,该模型是端到端的语言模型,能够较好地捕捉文本中存在的语法和语义特征,并且能够自动理解上下文的关联性。 模型主要由三个模块构成,分别是 RoBERTa 模块、BiLSTM 模块和 CRF 模块,各层的功能和原理如图 1 所示。 Roberta improves bert with new pretraining objectives, demonstrating bert was undertrained and training design is important You can find all the original roberta checkpoints under the facebook ai organization. Roberta is an example of how training strategies can significantly affect the performance of deep learning models, even without architectural changes

By optimizing bert's original pretraining procedure, it achieves higher accuracy and improved language understanding across a wide range of nlp tasks.

Roberta is a feminine version of the given names robert and roberto It is a germanic name derived from the stems *hrod meaning famous, glorious, godlike and *berht meaning bright, shining, light. Roberta (robustly optimized bert pretraining approach) is an optimized version of google’s popular bert model In this guide, we will dive into roberta’s architectural innovations, understand how to use it for nlp tasks, and walk through examples.

So, let’s get into the heart of things

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