通过基于变压器的模型来检测COVID-19假新闻
Jawaher Alghamdi1,2, Yuqing Lin1, Suhuai Luo1
1School of Information and Physical Sciences, The University of Newcastle, Newcastle, Australia.
Knowledge-based systems
|May 30, 2023
概括
检测COVID-19虚假新闻至关重要. 将COVID-Twitter-BERT (CT-BERT) 与BiGRU层相结合,获得了98%的F1得分,显著改善了错误信息的检测.
科学领域:
- 自然语言处理 (NLP) 是一种自然语言处理.
- 机器学习 (ML) 是指机器学习.
- 公共卫生 公共卫生
背景情况:
- 随着COVID-19大流行,健康错误信息的传播扩大了,造成了重大的公共健康风险.
- 检测假新闻,特别是混合内容的文章,对NLP来说是一个复杂的挑战.
- 准确识别COVID-19错误信息对于公共卫生沟通至关重要.
研究的目的:
- 评估用于检测COVID-19假新闻的机器学习算法.
- 评估微调预训练变压器模型 (如BERT和CT-BERT) 的有效性.
- 研究不同神经网络架构 (CNN,BiGRU) 对检测性能的影响.
主要方法:
- 使用了来自变压器 (BERT) 和COVID-Twitter-BERT (CT-BERT) 模型的双向编码器表示.
- 精心调整的预训练模型,具有冷和未冷的参数.
- 综合卷积神经网络 (CNN) 和双向门循环单元 (BiGRU) 层.
- 在一个真实世界的COVID-19相关新闻数据集上进行了实验.
主要成果:
- 用BiGRU层增强的CT-BERT模型实现了卓越的性能.
- 使用具有BiGRU配置的CT-BERT,获得了98%的最先进的F1得分.
- 不同的下游神经网络结构对检测准确性产生了不同的影响.
结论:
- 结合BiGRU的CT-BERT模型为COVID-19虚假新闻检测提供了一个高度有效的解决方案.
- 先进的机器学习,特别是基于变压器的模型,在打击健康错误信息方面显示出重大前景.
- 这些发现有助于减轻公共卫生危机期间虚假信息的传播.
相关概念视频
01:16Types Of Transformers
1.0K
Transformers can provide desired voltages to a circuit by modifying the number of turns in the secondary windings.
If the ratio of the number of turns in the secondary winding to that of the primary winding is greater than one, then the transformer is said to be a step-up transformer. In a step-up transformer, the voltage at the secondary winding is greater than the voltage applied at the primary winding.
However, if this ratio is less than one, the transformer is said to be a step-down...
If the ratio of the number of turns in the secondary winding to that of the primary winding is greater than one, then the transformer is said to be a step-up transformer. In a step-up transformer, the voltage at the secondary winding is greater than the voltage applied at the primary winding.
However, if this ratio is less than one, the transformer is said to be a step-down...
1.0K
01:26Transformers
1.1K
A device that transforms voltages from one value to another using induction is called a transformer. A transformer consists of two separate coils, or windings, wrapped around the same soft iron core. However, they are electrically insulated from each other.
The iron core has a substantial relative permeability. Therefore, the magnetic field lines generated due to the current in one winding are almost entirely confined within the core, such that the same magnetic flux permeates each turn of both...
The iron core has a substantial relative permeability. Therefore, the magnetic field lines generated due to the current in one winding are almost entirely confined within the core, such that the same magnetic flux permeates each turn of both...
1.1K
01:26The Ideal Transformer
441
In single-phase two-winding transformers, two windings are coiled around a magnetic core characterized by cross-sectional area A and magnetic permeability μ. A phasor current i1 enters the left winding while i2 exits the right winding, establishing the fundamental working of the transformer through electromagnetic principles.
Ampere's Law forms the basis of understanding the magnetic field within the transformer. It states that the integral of the magnetic field intensity's...
Ampere's Law forms the basis of understanding the magnetic field within the transformer. It states that the integral of the magnetic field intensity's...
441
01:27Transformers in Distribution System
131
Transformers in distribution systems can be broadly categorized into distribution substation transformers and other distribution transformers. They are crucial for stepping down high transmission voltages to levels suitable for distribution and end-user applications.
Distribution substation transformers come in various ratings and typically use mineral oil for insulation and cooling. To prevent moisture and air from entering the oil, some transformers use an inert gas like nitrogen to fill the...
Distribution substation transformers come in various ratings and typically use mineral oil for insulation and cooling. To prevent moisture and air from entering the oil, some transformers use an inert gas like nitrogen to fill the...
131
01:25Transformers with Off-Nominal Turns Ratios
183
In scenarios involving parallel transformers with disparate ratings, developing per-unit models requires accommodating off-nominal turns ratios. This situation arises when the selected base voltages are not proportional to the transformer’s voltage ratings. Consider a transformer where the rated voltages are related by the term a. If the chosen voltage bases satisfy a relationship involving term b, term c is defined as the ratio of these bases. This ratio is then substituted into the...
183
01:21Energy Losses in Transformers
911
In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality, the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
There are four main reasons for energy losses in transformers.
The first cause can be the high resistance of the...
There are four main reasons for energy losses in transformers.
The first cause can be the high resistance of the...
911