Population attributable fraction(PAF)refers to the proportion of all cases with a particular outcome in a population that could be prevented by eliminating a specific exposure.The authors of a recent paper evaluated t...Population attributable fraction(PAF)refers to the proportion of all cases with a particular outcome in a population that could be prevented by eliminating a specific exposure.The authors of a recent paper evaluated the prevalence and estimated the PAFs for risk factors of TB among elderly people in China[Inf Dis Poverty.2019;8:7].Confounding is inevitable in observational studies and Levin’s formula is of limited use in practice for unbiasedly estimating PAF.In a complex survey design,an unbiased estimation of the PAF can be calculated using a sample-weighted version of the Miettinen formula or a sample weighed parametric g-formula.With respect to causal interpretation of PAF in public health setting,computation of PAF is logical and practical when the exposure is amenable to intervention.展开更多
自然场景下的文本检测任务是图像处理领域中的难点之一.EAST(Efficient and Accurate Scene Text detector)算法是近年来比较出色的文本检测算法,但是增加后置处理之后的AdvancedEAST算法仍存在由于激活像素的头尾边界丢失导致的漏检情...自然场景下的文本检测任务是图像处理领域中的难点之一.EAST(Efficient and Accurate Scene Text detector)算法是近年来比较出色的文本检测算法,但是增加后置处理之后的AdvancedEAST算法仍存在由于激活像素的头尾边界丢失导致的漏检情况,对密集文本的检测效果也不是很理想.因此提出了Dilated-Corner Attention EAST(DCA_EAST)改进算法,对网络结构加入空洞卷积模块以及角点注意力模块,改善了漏检情况.针对损失函数,加入类别权重因子和样本难度权重因子,有效提升了密集文本的检测效果.实验结果表明,该算法在ICDAR2019的ReCTS数据集上准确率为93.02%,召回率为76.69%,F-measured值为84.07%,优于AdvancedEAST算法.展开更多
文摘Population attributable fraction(PAF)refers to the proportion of all cases with a particular outcome in a population that could be prevented by eliminating a specific exposure.The authors of a recent paper evaluated the prevalence and estimated the PAFs for risk factors of TB among elderly people in China[Inf Dis Poverty.2019;8:7].Confounding is inevitable in observational studies and Levin’s formula is of limited use in practice for unbiasedly estimating PAF.In a complex survey design,an unbiased estimation of the PAF can be calculated using a sample-weighted version of the Miettinen formula or a sample weighed parametric g-formula.With respect to causal interpretation of PAF in public health setting,computation of PAF is logical and practical when the exposure is amenable to intervention.
文摘自然场景下的文本检测任务是图像处理领域中的难点之一.EAST(Efficient and Accurate Scene Text detector)算法是近年来比较出色的文本检测算法,但是增加后置处理之后的AdvancedEAST算法仍存在由于激活像素的头尾边界丢失导致的漏检情况,对密集文本的检测效果也不是很理想.因此提出了Dilated-Corner Attention EAST(DCA_EAST)改进算法,对网络结构加入空洞卷积模块以及角点注意力模块,改善了漏检情况.针对损失函数,加入类别权重因子和样本难度权重因子,有效提升了密集文本的检测效果.实验结果表明,该算法在ICDAR2019的ReCTS数据集上准确率为93.02%,召回率为76.69%,F-measured值为84.07%,优于AdvancedEAST算法.
