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基于K-XGBoost融合模型的高校学生学情预测研究 被引量:1
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作者 赵宇奔 王鑫宁 李崇 《南京师大学报(自然科学版)》 CAS 北大核心 2023年第3期89-97,共9页
高精准的学情预测是提升高校教学水平促进教学改革的重要技术手段.目前学情预测存在数据维度单一和数据结构不平衡等问题,降低了预测模型的准确性与泛化能力.为此,本文提出了K-XGBoost学情预测融合模型.首先,该模型通过精准特征提取与重... 高精准的学情预测是提升高校教学水平促进教学改革的重要技术手段.目前学情预测存在数据维度单一和数据结构不平衡等问题,降低了预测模型的准确性与泛化能力.为此,本文提出了K-XGBoost学情预测融合模型.首先,该模型通过精准特征提取与重构,构建基于高校教务处数据库的多维度学情特征集;其次,设计基于最小2-范数的聚类算法,创新性地建立无监督数据平衡化机制;最后,基于损失函数优化的XGBoost集成学习方法设计学情预测模块,构建高准确性和高泛化能力的K-XGBoost学情预测融合算法.实验结果表明,K-XGBoost多个子类模型的预测值均较好地逼近真实值,可将成绩预测结果的平均绝对误差(MAE)和均方根误差(RMSE)相较基线XGBoost模型分别降低了76.19%、85.33%,显著提升了学情预测的准确性和泛化能力. 展开更多
关键词 K-XGBoost 学情预测 数据挖掘 机器学习 集成学习
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学习云空间中基于大数据分析的学情预测研究 被引量:12
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作者 王希哲 黄昌勤 +1 位作者 朱佳 徐小琪 《电化教育研究》 CSSCI 北大核心 2018年第10期60-67,共8页
随着学习云空间应用的不断深入,海量过程性数据与富媒体资源使其呈现为典型大数据特征环境。文章对学习云空间的大数据特征、分析方法及其带来的机遇进行了深入的分析,并依据学习云空间传统数据及其过程性数据提出一种学情预测模型及其... 随着学习云空间应用的不断深入,海量过程性数据与富媒体资源使其呈现为典型大数据特征环境。文章对学习云空间的大数据特征、分析方法及其带来的机遇进行了深入的分析,并依据学习云空间传统数据及其过程性数据提出一种学情预测模型及其实现方法。在模型构建过程中,通过计算各学情因素的Gini增益,实现学习效果影响程度的判别,并提出改进的并行随机森林算法,以世界大学城系统平台为支撑进行学习预测与效果检验。结果表明,该方法较为有效地实现了大数据环境下学习云空间的学情预测,并为学习云空间中基于大数据技术的智能服务提供了一种可行的参考方案。 展开更多
关键词 网络学习空间 学习云空间 教育大数据 关联性判别 学情预测 并行随机森林
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混合教学中的学情预测模型分析
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作者 李支成 陈刚 +3 位作者 向华 朱家成 吴开诚 沈宁 《电子技术(上海)》 2021年第10期126-127,共2页
阐述对提取的混合教学数据进行分析和预处理,利用机器学习算法建立学情预测模型,能够对学生进行有效的分层。通过学情预测模型把学生分为三层,从而实现对学生的分层、督学和预警。
关键词 混合教学 学情预测 机器学习
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An improved brain emotional learning algorithm for accurate and efficient data analysis 被引量:1
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作者 梅英 谭冠政 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第5期1084-1098,共15页
To overcome the deficiencies of high computational complexity and low convergence speed in traditional neural networks, a novel bio-inspired machine learning algorithm named brain emotional learning (BEL) is introdu... To overcome the deficiencies of high computational complexity and low convergence speed in traditional neural networks, a novel bio-inspired machine learning algorithm named brain emotional learning (BEL) is introduced. BEL mimics the emotional learning mechanism in brain which has the superior features of fast learning and quick reacting. To further improve the performance of BEL in data analysis, genetic algorithm (GA) is adopted for optimally tuning the weights and biases of amygdala and orbitofrontal cortex in BEL neural network. The integrated algorithm named GA-BEL combines the advantages of the fast learning of BEL, and the global optimum solution of GA. GA-BEL has been tested on a real-world chaotic time series of geomagnetic activity index for prediction, eight benchmark datasets of university California at Irvine (UCI) and a functional magnetic resonance imaging (fMRI) dataset for classifications. The comparisons of experimental results have shown that the proposed GA-BEL algorithm is more accurate than the original BEL in prediction, and more effective when dealing with large-scale classification problems. Further, it outperforms most other traditional algorithms in terms of accuracy and execution speed in both prediction and classification applications. 展开更多
关键词 PREDICTION CLASSIFICATION brain emotional learning genetic algorithm
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Chinese College Students Seeking Psychological Help From Professionals^Rationally Should but Emotionally not? 被引量:1
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作者 Haiping Wang Yan Ruth Xia 《Sociology Study》 2017年第4期212-222,共11页
The purpose of the present research was to investigate the predictors to Chinese college students seeking psychological help from professionals. By surveying 1,408 Chinese college students at five universities in Chin... The purpose of the present research was to investigate the predictors to Chinese college students seeking psychological help from professionals. By surveying 1,408 Chinese college students at five universities in China's Mainland, the results showed that among the factors examined, problem severity and help-seeking attitudes directly predicted help-seeking intention, while gender and subjective norms had a significant effect on college students' professional psychological help-seeking intention through help-seeking attitudes. Overall, the model explained 25% and 38.0% (for half-1 and half-2 data sets, respectively) of the variances of help-seeking intention. The results indicated that mainland Chinese college students rationally knew that they should choose to seek such professional help when the problem got severer enough, although they were emotionally reluctant to seek professional psychological help due to negative subjective norms around them. The implications and limitations were discussed. 展开更多
关键词 College students HELP-SEEKING PREDICTORS
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