Assessment of Sentiment Analysis Using Information Gain Based Feature Selection Approach

Sentiment analysis is the process of determining the intention or emotion behind an article.The subjective information from the context is analyzed by the sentimental analysis of the people’s opinion.The data that is analyzed quantifies the reactions or sentiments and reveals the information’s contextual polarity.In social behavior,sentiment can be thought of as a latent variable.Measuring and comprehending this behavior could help us to better understand the social issues.Because sentiments are domain specific,sentimental analysis in a specific context is critical in any real-world scenario.Textual sentiment analysis is done in sentence,document level and feature levels.This work introduces a new Information Gain based Feature Selection(IGbFS)algorithm for selecting highly correlated features eliminating irrelevant and redundant ones.Extensive textual sentiment analysis on sentence,document and feature levels are performed by exploiting the proposed Information Gain based Feature Selection algorithm.The analysis is done based on the datasets from Cornell and Kaggle repositories.When compared to existing baseline classifiers,the suggested Information Gain based classifier resulted in an increased accuracy of 96%for document,97.4%for sentence and 98.5%for feature levels respectively.Also,the proposed method is tested with IMDB,Yelp 2013 and Yelp 2014 datasets.Experimental results for these high dimensional datasets give increased accuracy of 95%,96%and 98%for the proposed Information Gain based classifier for document,sentence and feature levels respectively compared to existing baseline classifiers.

Leveraging Vision-Language Pre-Trained Model and Contrastive Learning for Enhanced Multimodal Sentiment Analysis

Multimodal sentiment analysis is an essential area of research in artificial intelligence that combines multiple modes,such as text and image,to accurately assess sentiment.However,conventional approaches that rely on unimodal pre-trained models for feature extraction from each modality often overlook the intrinsic connections of semantic information between modalities.This limitation is attributed to their training on unimodal data,and necessitates the use of complex fusion mechanisms for sentiment analysis.In this study,we present a novel approach that combines a vision-language pre-trained model with a proposed multimodal contrastive learning method.Our approach harnesses the power of transfer learning by utilizing a vision-language pre-trained model to extract both visual and textual representations in a unified framework.We employ a Transformer architecture to integrate these representations,thereby enabling the capture of rich semantic infor-mation in image-text pairs.To further enhance the representation learning of these pairs,we introduce our proposed multimodal contrastive learning method,which leads to improved performance in sentiment analysis tasks.Our approach is evaluated through extensive experiments on two publicly accessible datasets,where we demonstrate its effectiveness.We achieve a significant improvement in sentiment analysis accuracy,indicating the supe-riority of our approach over existing techniques.These results highlight the potential of multimodal sentiment analysis and underscore the importance of considering the intrinsic semantic connections between modalities for accurate sentiment assessment.

An Analysis Model of Learners’ Online Learning Status Based on Deep Neural Network and Multi-Dimensional Information Fusion

The learning status of learners directly affects the quality of learning.Compared with offline teachers,it is difficult for online teachers to capture the learning status of students in the whole class,and it is even more difficult to continue to pay attention to studentswhile teaching.Therefore,this paper proposes an online learning state analysis model based on a convolutional neural network and multi-dimensional information fusion.Specifically,a facial expression recognition model and an eye state recognition model are constructed to detect students’emotions and fatigue,respectively.By integrating the detected data with the homework test score data after online learning,an analysis model of students’online learning status is constructed.According to the PAD model,the learning state is expressed as three dimensions of students’understanding,engagement and interest,and then analyzed from multiple perspectives.Finally,the proposed model is applied to actual teaching,and procedural analysis of 5 different types of online classroom learners is carried out,and the validity of the model is verified by comparing with the results of the manual analysis.

Using Informative Score for Instance Selection Strategy in Semi-Supervised Sentiment Classification

Sentiment classification is a useful tool to classify reviews about sentiments and attitudes towards a product or service.Existing studies heavily rely on sentiment classification methods that require fully annotated inputs.However,there is limited labelled text available,making the acquirement process of the fully annotated input costly and labour-intensive.Lately,semi-supervised methods emerge as they require only partially labelled input but perform comparably to supervised methods.Nevertheless,some works reported that the performance of the semi-supervised model degraded after adding unlabelled instances into training.Literature also shows that not all unlabelled instances are equally useful;thus identifying the informative unlabelled instances is beneficial in training a semi-supervised model.To achieve this,an informative score is proposed and incorporated into semisupervised sentiment classification.The evaluation is performed on a semisupervised method without an informative score and with an informative score.By using the informative score in the instance selection strategy to identify informative unlabelled instances,semi-supervised models perform better compared to models that do not incorporate informative scores into their training.Although the performance of semi-supervised models incorporated with an informative score is not able to surpass the supervised models,the results are still found promising as the differences in performance are subtle with a small difference of 2%to 5%,but the number of labelled instances used is greatly reduced from100%to 40%.The best finding of the proposed instance selection strategy is achieved when incorporating an informative score with a baseline confidence score at a 0.5:0.5 ratio using only 40%labelled data.

Design and Implementation of Weibo Sentiment Analysis Based on LDA and Dependency Parsing

Information content security is a branch of cyberspace security. How to effectively manage and use Weibo comment information has become a research focus in the field of information content security. Three main tasks involved are emotion sentence identification and classification,emotion tendency classification,and emotion expression extraction. Combining with the latent Dirichlet allocation(LDA) model,a Gibbs sampling implementation for inference of our algorithm is presented,and can be used to categorize emotion tendency automatically with the computer. In accordance with the lower ratio of recall for emotion expression extraction in Weibo,use dependency parsing,divided into two categories with subject and object,summarized six kinds of dependency models from evaluating objects and emotion words,and proposed that a merge algorithm for evaluating objects can be accurately evaluated by participating in a public bakeoff and in the shared tasks among the best methods in the sub-task of emotion expression extraction,indicating the value of our method as not only innovative but practical.

Sentiment Lexicon Construction Based on Improved Left-Right Entropy Algorithm

A novel method of constructing sentiment lexicon of new words(SLNW)is proposed to realize effective Weibo sentiment analysis by integrating existing lexicons of sentiments,lexicons of degree,negation and network.Based on left-right entropy and mutual information(MI)neologism discovery algorithms,this new algorithm divides N-gram to obtain strings dynamically instead of relying on fixed sliding window when using Trie as data structure.The sentiment-oriented point mutual information(SO-PMI)algorithm with Laplacian smoothing is used to distinguish sentiment tendency of new words found in the data set to form SLNW by putting new words to basic sentiment lexicon.Experiments show that the sentiment analysis based on SLNW performs better than others.Precision,recall and F-measure are improved in both topic and non-topic Weibo data sets.

Enhancement of Sentiment Analysis Using Clause and Discourse Connectives

The sentiment of a text depends on the clausal structure of the sentence and the connectives’discourse arguments.In this work,the clause boundary,discourse argument,and syntactic and semantic information of the sentence are used to assign the text’s sentiment.The clause boundaries identify the span of the text,and the discourse connectives identify the arguments.Since the lexicon-based analysis of traditional sentiment analysis gives the wrong sentiment of the sentence,a deeper-level semantic analysis is required for the correct analysis of sentiments.Hence,in this study,explicit connectives in Malayalam are considered to identify the discourse arguments.A supervised method,conditional random fields,is used to identify the clause boundary and discourse arguments.For the study,1,000 sentiment sentences from Malayalam documents were analyzed.Experimental results show that the discourse structure integration considerably improves sentiment analysis performance from the baseline system.

Aspect-Based Sentiment Classification Using Deep Learning and Hybrid of Word Embedding and Contextual Position

Aspect-based sentiment analysis aims to detect and classify the sentiment polarities as negative,positive,or neutral while associating them with their identified aspects from the corresponding context.In this regard,prior methodologies widely utilize either word embedding or tree-based rep-resentations.Meanwhile,the separate use of those deep features such as word embedding and tree-based dependencies has become a significant cause of information loss.Generally,word embedding preserves the syntactic and semantic relations between a couple of terms lying in a sentence.Besides,the tree-based structure conserves the grammatical and logical dependencies of context.In addition,the sentence-oriented word position describes a critical factor that influences the contextual information of a targeted sentence.Therefore,knowledge of the position-oriented information of words in a sentence has been considered significant.In this study,we propose to use word embedding,tree-based representation,and contextual position information in combination to evaluate whether their combination will improve the result’s effectiveness or not.In the meantime,their joint utilization enhances the accurate identification and extraction of targeted aspect terms,which also influences their classification process.In this research paper,we propose a method named Attention Based Multi-Channel Convolutional Neural Net-work(Att-MC-CNN)that jointly utilizes these three deep features such as word embedding with tree-based structure and contextual position informa-tion.These three parameters deliver to Multi-Channel Convolutional Neural Network(MC-CNN)that identifies and extracts the potential terms and classifies their polarities.In addition,these terms have been further filtered with the attention mechanism,which determines the most significant words.The empirical analysis proves the proposed approach’s effectiveness compared to existing techniques when evaluated on standard datasets.The experimental results represent our approach outperforms in the F1 measure with an overall achievement of 94%in identifying aspects and 92%in the task of sentiment classification.

情感分歧对社交媒体中信息再传播的影响——以微博为例

[研究目的]社交媒体中信息的再传播是目前主流传播方式之一,研究情感特征对社交媒体中信息再传播的作用,揭示情感信息影响社交媒体中信息再传播的机制,对于科学引导网络舆论、维持健康网络环境具有重要意义。[研究方法]基于认知失调理论,引入情感分歧特征进行情感分析,以社交媒体中帖子的转发数与评论数作为信息再传播效果的衡量指标,构建了情感分歧与情感倾向影响信息再传播的理论模型,并使用微博平台上的数据,对模型进行验证。[研究结论]通过对回归模型结果分析,情感分歧能够显著正向影响社交媒体信息再传播,促进帖子的转发与评论;正面情感倾向性能够显著促进帖子的转发效果,对帖子的评论数影响效果并不显著;帖子内容的情感倾向性能够调节帖子内容中的情感分歧对帖子转发的影响,而评论情感倾向能够调节评论内容中的情感分歧对帖子评论数的影响。

企业ESG与资本市场表现——来自股票流动性的证据

在经济社会发展绿色化、低碳化态势下,ESG理念在资本市场中的地位日益凸显。文章基于2015—2021年我国A股上市公司数据,研究ESG表现对企业股票流动性的影响。研究发现,ESG表现显著提升了企业股票流动性,该效应在国有企业、大规模企业以及市场化程度较高的地区企业中更显著。机制分析表明,企业ESG有利于提升投资者情绪和信息透明度,进而促进股票流动性。进一步研究发现,企业良好ESG表现所带来的股票流动性显著提升了企业价值和企业创新。发掘企业ESG在金融市场的作用效果,为活跃资本市场提供新的经验证据。

双模态双向感知下语义信息增强的多模态情感分析

针对不同模态间存在情感信息分布不均匀,难以获得更深层次的多模态情感语义信息问题,提出了一种双模态双向感知下语义信息增强的多模态情感分析方法。对文本-视觉模态、文本-音频模态分别融合,捕获双模态话语中的相互依赖关系,获得模态间双向的上下文感知信息;考虑到双模态在融合时产生较多冗余信息,采用门控机制选择有效的情感特征,以提升识别关键情感信息的能力;通过跨模态信息交互机制对多种模态间的信息进行建模,得到语义信息增强的模态特征向量。在公开的多模态情感分析数据集CMU-MOSI上对所提出的模型进行评估,实验结果表明,该模型的情感分析结果优于大多数现有先进的多模态情感分析方法,能够有效提升情感分析的性能。

基于语序知识的双通道图卷积网络方面级情感分析

当前大多数基于图卷积网络的方面级情感分析方法利用文本的句法知识、语义知识、情感知识构建文本依赖,但少有研究利用文本语序知识构建文本依赖,导致图卷积网络不能有效地利用文本语序知识引导方面项学习上下文情感信息,从而限制了其性能。针对上述问题,提出基于语序知识的双通道图卷积网络(dual-channel graph convolutional network with word-order knowledge,WKDGCN)模型,该模型由语序图卷积网络(word-order graph convolutional network,WoGCN)和情感知识结合语义知识增强的句法图卷积网络(sentiment and attention-enhanced graph convolutional network,SAGCN)组成。具体地,WoGCN基于文本的语序知识构建图卷积网络,由文本的语序依赖引导方面项特征学习上下文情感信息;SAGCN利用SenticNet中的情感知识结合注意力机制增强句法依赖,利用增强后的句法依赖构建图卷积网络,以此引导方面项特征学习上下文情感信息;最后融合两个图卷积网络的特征用于情感分类。此外,设计了一种权重分配策略,在放大方面项权重的同时保持上下文权重一致,避免错误的计算方面项特征与重要特征的语义相关性。在多个公开数据集上的实验结果表明,所提方法优于对比模型。

面向视频数据的多模态情感分析

多模态情感分析旨在从文本、图像和音频数据中提取和整合语义信息,从而识别在线视频中说话者的情感状态。尽管多模态融合方案在此研究领域已取得一定成果,但是已有方法在处理模态间分布差异和关系知识的融合方面仍有欠缺,为此,提出一种多模态情感分析方法。设计一种多模态提示门(MPG)模块,其能够将非语言信息转换为融合文本上下文的提示,利用文本信息对非语言信号的噪声进行过滤,得到包含丰富语义信息的提示,以增强模态间的信息整合。此外,提出一种实例到标签的对比学习框架,在语义层面上区分隐空间中的不同标签以进一步优化模型输出。在3个大规模情感分析数据集上的实验结果表明,该方法的二分类精度相对次优模型提高了约0.7%,三分类精度提高了超过2.5%,达到0.671。该方法能够为将多模态情感分析引入用户画像、视频理解、AI面试等领域提供参考。

上市公司互动式信息沟通能够降低股票错误定价吗?

资本市场本质上是一个信息市场,信息是决定上市公司股票价值最重要的因素之一。随着信息技术的运用和市场成熟度的提高,上市公司与投资者之间的信息传递模式正在由“单向式信息披露”向“互动式信息沟通”转变。本文考察了我国上市公司与投资者新型互动式信息沟通行为对股票市场定价效率的影响。研究发现:上市公司与投资者的互动式信息沟通行为越积极,即回复率越高、回复越及时,公司股票的错误定价程度越低;公司与投资者的积极互动沟通行为主要通过减少投资者异质信念、增加股价信息含量和改善公司信息环境来降低股票错误定价水平;进一步结合我国股票市场特征发现,这种互动沟通产生的定价效率优化效应在投资者情绪较强、机构投资者持股较少的公司中更加显著。本文的研究结论证实了我国交易所监管下互动沟通平台的市场有效性,同时也为进一步优化市场资源配置的效果提供了新的经验证据。

融合多元文本信息和注意力机制的方面级情感分类方法

为了解决当前情感分类方法对于文本信息利用不充分并且缺乏对用户偏好的考虑从而导致情感分类准确率不高的问题,论文引入注意力机制来处理多元文本,并利用SRNN模型来充分地提取文本的隐藏特征,提出了一种融合多元文本信息和注意力机制的方面级情感分类方法。该方法以电商平台为研究对象,综合利用商品简介文本和用户评论文本,首先利用注意力机制使两种文本信息互相作用,得到融合了多元文本的表示向量;然后分别在正向和反向上进行处理以充分地提取文本的隐藏特征;最后对评论信息中涉及的不同方面分别以对应的方面处理模块进行训练,根据用户偏好得到其最感兴趣的方面,将特征向量输入该方面处理模块中,进行方面级情感极性计算,最终得到情感分类结果。论文在豆瓣数据集上进行了对比实验,实验结果表明,论文所提方法在准确率和F1值上相较于当前主流的基于LSTM、CNN的方法都有明显提升。

融合双图卷积与门控线性单元的方面级情感分析模型

方面级情感分析旨在确定句子中给定方面的情感极性。现有的基于图神经网络的方面级情感分析存在以下2个方面的不足:忽略了不同类型的句法依存关系和语料库中的词共现信息,以及不能准确地控制情感信息流向给定方面。针对以上问题,提出融合双图卷积与门控线性单元(GLU)的方面级情感分析模型。该模型首先采用全局词汇图来编码语料库中的词共现信息,在词汇图和句法图上利用分类概括结构来区分各种词共现频率和不同类型的句法依存关系。然后分别在2个图上进行双层卷积,继而使用Bi Affine变换模块作为桥梁,在2个图卷积网络模块之间有效地交换相关特征,从而有效地融合句法信息和词汇信息。最后利用GLU控制情感信息流向给定方面,使模型可以更专注地分析与该方面相关的情感信息,避免不相关的情感信息影响对给定方面的情感分析结果,从而提高分析的准确性。实验结果表明,在Twitter、Laptop14、Restaurant15和Restaurant16数据集上,该模型的准确率分别达到74.82%、77.61%、82.29%和89.81%,F1值分别达到72.97%、73.52%、67.72%和73.37%,方面级情感分类效果明显优于其他基线模型。

基于Kano模型的突发公共事件政务微博回应与公众信息需求适配性研究

【目的/意义】政府回应是政府应对突发事件时维稳民心、疏导舆论的重要举措。对公众信息需求进行精准定位并对其与政务微博回应作适配性分析,有助于总结政府回应的经验教训并明确改进策略,为提高回应效能提供参考。【方法/过程】基于公众在线评论数据,采用Kano模型对公众信息需求进行具体的属性定调,分析舆情演化不同阶段下公众信息需求与政府回应适配性的差异化表征,提出提升政府回应效能的对策建议。【结果/结论】突发事件发生后公众的信息需求呈现差异化表征,公众信息需求与政府回应的适配度会直接影响回应的精准度与公众的满意度。因此,在应对突发公共舆情事件时,政府应根据公众的情感与真实需求精准调整、优化和改进回应策略,树立良好的政府形象。

融合双通道的语义信息的方面级情感分析

针对方面级情感分析任务中语义信息难以提取以及方面词信息难以和上下文信息相关联的问题,提出一种融合双通道的语义信息模型(FDCS)。通过BERT预训练模型搭建两个通道获取不同层次的语义信息,一个是全局信息通道,另一个是句子信息通道;使用语义注意力融合双通道中不同层次的语义信息,将融合后的语义信息再次分别融入全局信息和句子信息;根据每个通道语义信息的不同分别提取相应的特征信息。在3个基准数据集上的实验结果表明,该模型的性能优于其它模型。

结合外部知识重构依赖矩阵的交互式图卷积网络

方面级情感分析旨在预测给定句子中特定方面的情感极性。然而,现有大多数研究在对模型改进的过程中忽略了外部知识的有效利用,导致模型无法准确识别方面词的情感极性。另外,仅仅考虑有限的上下文信息可能会使得模型在分析方面词时忽略其在句子中的重要性和影响。基于此,提出了一种结合外部知识构建依赖增强矩阵的图卷积网络模型的方法(Dependency Enhancement Matrix GCN,DEMGCN)。该方法首先将词嵌入和位置嵌入进行融合,得到包含位置信息的句子特征向量;同时引入情感常识信息对原始依赖矩阵进行扩展,形成新的依赖增强矩阵DEM,这在一定程度上突出了情感词的权重信息,并且弥补了原始依赖树无法捕获边缘标签的不足。此外,构建了一个信息交互网络(Information Interaction Network,IIN),通过方面词与上下文之间的交互来提取全局的句子信息。最后,在5个基准数据集上的实验结果显示,与基线模型相比DEMGCN在准确率和Macro-F1上分别提高了1~2百分点。

基于LDA主题模型的社交媒体隐私政策合规性评价研究

[目的/意义]在个人信息保护日渐重要的今天,开展我国社交媒体隐私政策合规性评价研究,可为完善社交媒体隐私政策和加强个人信息保护提供参考。[方法/过程]文章选取28个常用社交媒体,基于LDA主题模型、完整性评价和阅读感分析对其隐私政策文本进行比较分析。[结果/结论]研究发现,随着相关信息保护法的出台,社交媒体在隐私保护、信息安全等方面已取得了积极进步,但在政策完整性、特殊群体的保护和可读性方面仍有进一步完善的空间。未来,可从法制建设和用户权利保障、特殊群体保护以及文本可读性3个方面进行完善。