Results 41 to 50 of about 230,931 (257)
知识蒸馏是一种常用于解决BERT等深度预训练模型规模大、推断慢等问题的模型压缩方案。采用“多教师蒸馏”的方法,可以进一步提高学生模型的表现,而传统的对教师模型中间层采用的“一对一”强制指定的策略会导致大部分的中间特征被舍弃。提出了一种“单层对多层”的映射方式,解决了知识蒸馏时中间层无法对齐的问题,帮助学生模型掌握教师模型中间层中的语法、指代等知识。在GLUE中的若干数据集的实验表明,学生模型在保留了教师模型平均推断准确率的93.9%的同时,只占用了教师模型平均参数规模的41.5%。
石佳来, 郭卫斌
doaj +1 more source
Varying-coefficient Panel Data Models with Cross-sectional Dependence: Estimation and Specification Testing [PDF]
由于可以有效地控制不可观测的个体异质性和为更现实的行为假设建模等优势,面板数据模型被广泛地应用到经济学和金融学等领域的实证研究中。然而,传统的面板数据模型假设模型具有参数线性形式并且各个截面个体是相互独立的。参数线性假设可能造成模型误设。截面独立的假设经常与现实不符。为了解决上述问题,本论文提出了一类具有截面相关的变系数面板数据模型。同时,为了判断在实证分析中是否应该使用本论文提出的变系数模型,我们构造了检验变系数面板数据模型系数稳定性的检验统计量。论文主体共包括三个部分,其具体安排如下: 首先 ...
徐秋华
core
Abstract In the western United States, conservation practitioners are increasingly working with private landowners to restore habitat for North American beavers (Castor canadensis) and to use nonlethal mitigation techniques when beavers damage crops and infrastructure.
Brian D. Erickson, Megan S. Jones
wiley +1 more source
根据一些常用的土壤持水经验模型(VG模型、BC模型和CP模型)推求用于估算非饱和导水率函数的表达式,并采用田间实测的导水率数据与模拟估值进行对比.结果表明这些估算模型适宜用来描述细质地以上土壤的非饱和导水特性,且VG模型的估值效果要好于其他模型.当满足使用条件时,间接估值法可获得较好的模拟估值精度.
许迪 Mermoud A
doaj
Greenhouse gas emissions from croplands of China [PDF]
China possesses cropland of 1.33 million km 2. Cultivation of the cropland not only altered the biogeochemical cycles of carbon (C) and nitrogen (N) in the agroecosystems but also affected global climate.
Bohan, Liao +13 more
core +1 more source
Abstract Despite the crucial role of human impacts on biodiversity loss, many assessments of this loss focus on single metrics, such as species richness, and overlook the multidimensional effects of human activities. Because of its importance to ecosystem functioning, we investigated the functional diversity of medium‐ and large‐sized mammal ...
Xueyou Li +8 more
wiley +1 more source
设平板加劲肋矩形钢管混凝土柱静载下ABAQUS本构模型的研究
对设平板加劲肋钢管混凝土柱静载下ABAQUS本构模型进行研究。首先对收集的设平板加劲肋钢管混凝土短柱轴压试验进行介绍;从混凝土本构模型、钢材本构模型、钢-混凝土界面黏结模型以及初始缺陷、残余应力的引入等方面入手进行分析;对比分析了Schneider模型、Saenz模型、韩林海模型及陶忠模型四种核心混凝土受压本构关系,在此基础上提出了考虑设肋钢管约束效应的核心混凝土单轴受压应力-应变本构关系;对钢材本构、钢-混凝土界面本构等模型进行了对比分析。通过采用本构模型进行了有限元仿真模拟 ...
李肖, 张元植
doaj
Using porous metals to enhance heat transfer in phase change materials (PCMs) [PDF]
Heat transfer enhancement mechanism of Phase Change Materials (PCMs) by high-porosity metal foams was investigated in this study. The Darcy-Brinkman-Forchheimer modified flow model was employed in the numerical simulations to consider the non-Darcy ...
Tian, Y. (Yuan), Zhao, Changying
core
Abstract Human development is a driver of global change and a major threat to biodiversity. Protected areas maintain and support biodiversity, but outside stressors, such as climate change and land use change, can negatively influence natural resources within protected areas.
Leah J. Rudge +2 more
wiley +1 more source
通过福建及台湾海峡地区的新一维速度模型与现有华南速度模型的对比,讨论了新一维速度模型在福建地震观测台网的适用性。理论走时分析结果表明,尽管两个速度模型差异明显,但震中距在0—100 km范围内的震相理论走时相差较小,一定程度上说明两速度模型所给出的本区域地壳平均速度差异较小。对利用18次人工定点爆破记录的地震定位结果的分析表明:当震源深度不受约束时,应用华南速度模型的定位结果精度稍优于新一维速度模型;将震源深度固定为0 km后,应用新一维速度模型的定位结果精度则明显优于华南模型 ...
Hongcai Zhang +4 more
doaj +1 more source

