Selection of negative samples significantly influences landslide susceptibility assessment,especially when establishing the relationship between landslides and environmental factors in regions with complex geological ...Selection of negative samples significantly influences landslide susceptibility assessment,especially when establishing the relationship between landslides and environmental factors in regions with complex geological conditions.Traditional sampling strategies commonly used in landslide susceptibility models can lead to a misrepresentation of the distribution of negative samples,causing a deviation from actual geological conditions.This,in turn,negatively affects the discriminative ability and generalization performance of the models.To address this issue,we propose a novel approach for selecting negative samples to enhance the quality of machine learning models.We choose the Liangshan Yi Autonomous Prefecture,located in southwestern Sichuan,China,as the case study.This area,characterized by complex terrain,frequent tectonic activities,and steep slope erosion,experiences recurrent landslides,making it an ideal setting for validating our proposed method.We calculate the contribution values of environmental factors using the relief algorithm to construct the feature space,apply the Target Space Exteriorization Sampling(TSES)method to select negative samples,calculate landslide probability values by Random Forest(RF)modeling,and then create regional landslide susceptibility maps.We evaluate the performance of the RF model optimized by the Environmental Factor Selection-based TSES(EFSTSES)method using standard performance metrics.The results indicated that the model achieved an accuracy(ACC)of 0.962,precision(PRE)of 0.961,and an area under the curve(AUC)of 0.962.These findings demonstrate that the EFSTSES-based model effectively mitigates the negative sample imbalance issue,enhances the differentiation between landslide and non-landslide samples,and reduces misclassification,particularly in geologically complex areas.These improvements offer valuable insights for disaster prevention,land use planning,and risk mitigation strategies.展开更多
针对多目标萤火虫算法在处理大规模稀疏多目标优化问题中存在的Pareto最优解稀疏性维持困难以及种群难以收敛的问题,提出了一种得分引导与特征选择的分层多目标萤火虫算法(hierarchical multi-objective firefly algorithm based on sco...针对多目标萤火虫算法在处理大规模稀疏多目标优化问题中存在的Pareto最优解稀疏性维持困难以及种群难以收敛的问题,提出了一种得分引导与特征选择的分层多目标萤火虫算法(hierarchical multi-objective firefly algorithm based on score guidance and feature selection,HLsMOFA)。该算法提出得分引导的初始化策略,计算决策变量初始得分,生成稀疏性状态的初始种群;构建特征选择的得分更新机制,引入Relief算法计算特征权重,在每次迭代时结合特征纯度共同更新决策变量得分,进一步维持Pareto最优解的稀疏特性;设计分层学习模式,将萤火虫种群按比例进行分层,减少移动过程中个体受全吸引模型影响而产生的振荡,提升算法在大规模决策空间中的收敛性能。实验结果表明,HLsMOFA较选择的对比算法具有更好的收敛性与多样性。展开更多
基金supported by Natural Science Research Project of Anhui Educational Committee(2023AH030041)National Natural Science Foundation of China(42277136)Anhui Province Young and Middle-aged Teacher Training Action Project(DTR2023018).
摘要Selection of negative samples significantly influences landslide susceptibility assessment,especially when establishing the relationship between landslides and environmental factors in regions with complex geological conditions.Traditional sampling strategies commonly used in landslide susceptibility models can lead to a misrepresentation of the distribution of negative samples,causing a deviation from actual geological conditions.This,in turn,negatively affects the discriminative ability and generalization performance of the models.To address this issue,we propose a novel approach for selecting negative samples to enhance the quality of machine learning models.We choose the Liangshan Yi Autonomous Prefecture,located in southwestern Sichuan,China,as the case study.This area,characterized by complex terrain,frequent tectonic activities,and steep slope erosion,experiences recurrent landslides,making it an ideal setting for validating our proposed method.We calculate the contribution values of environmental factors using the relief algorithm to construct the feature space,apply the Target Space Exteriorization Sampling(TSES)method to select negative samples,calculate landslide probability values by Random Forest(RF)modeling,and then create regional landslide susceptibility maps.We evaluate the performance of the RF model optimized by the Environmental Factor Selection-based TSES(EFSTSES)method using standard performance metrics.The results indicated that the model achieved an accuracy(ACC)of 0.962,precision(PRE)of 0.961,and an area under the curve(AUC)of 0.962.These findings demonstrate that the EFSTSES-based model effectively mitigates the negative sample imbalance issue,enhances the differentiation between landslide and non-landslide samples,and reduces misclassification,particularly in geologically complex areas.These improvements offer valuable insights for disaster prevention,land use planning,and risk mitigation strategies.
摘要针对多目标萤火虫算法在处理大规模稀疏多目标优化问题中存在的Pareto最优解稀疏性维持困难以及种群难以收敛的问题,提出了一种得分引导与特征选择的分层多目标萤火虫算法(hierarchical multi-objective firefly algorithm based on score guidance and feature selection,HLsMOFA)。该算法提出得分引导的初始化策略,计算决策变量初始得分,生成稀疏性状态的初始种群;构建特征选择的得分更新机制,引入Relief算法计算特征权重,在每次迭代时结合特征纯度共同更新决策变量得分,进一步维持Pareto最优解的稀疏特性;设计分层学习模式,将萤火虫种群按比例进行分层,减少移动过程中个体受全吸引模型影响而产生的振荡,提升算法在大规模决策空间中的收敛性能。实验结果表明,HLsMOFA较选择的对比算法具有更好的收敛性与多样性。