查询词典 forward difference quotient

A leave-one-out error bound for SVR is derived in this paper. After the SVR model is obtained for a given set of hyperparameters, the bound can be computed with very little additional work. Considering the properties of the bound, an optimization method based on difference quotient is proposed.

本文针对当前SVR推广误差的估计大多需要较大计算费用的情况，推导出SVR的留一法误差的易于计算的界，这个界在得到学习算法的解后需要很少的额外工作量。

Through the suitable selection of difference quotient and correction of the one-dimension inaccuracy linear searching,scope of the improved method is extended.

从应用角度出发，首先，将约束变尺度法改进为一般约束条件，通过适当选择差商形式和对一维不精确线性搜索方法的修正，扩大了该方法的适用范围。

The weight values in NLSM were adjusted automatically according to target data, which allowed the measured data with different dimensions or ranges to be treated at the same level, and thus the accuracy and stability of algorithm were improved accordingly. Derivative was replaced by the difference quotient in NLSM which further improved the algorithm speed.

非线性最小二乘法的权值根据目标数据自动调整，使得不同量纲和不同数值范围的观测数据可以在同一水平上进行，提高了计算的精度和稳定性；另一方面用差商近似代替导数加快了算法的收敛速度。

The concept of topology optimization of truss structures with discrete variables including two kinds of variables and the relative difference quotient algorithm for discrete optimization are extended to the topology optimization of plate and shell structures composed by plate and shell elements.

将包含两类变量的桁架结构拓扑优化设计的概念及求解离散优化的相对差商法进一步推广到由板壳单元组成的板壳结构的拓扑优化，建立了包含两类变量的板壳结构拓扑优化设计模型，并采用相对差商算法进行求解。

Since we adopt Newton interpolation of difference quotient from the discrete data pool of unequal distance node among the scaled temperature (20℃, 1000℃), aluminum purity and aluminum density, it can greatly be approached.

我们从刻画的温度( 2 0℃、1 0 0 0℃)、铝纯度与铝密度间不等距结点的离散数据集中、采用了Newton差商插值、能极好地加以逼近、从而建立了高精度的四阶非线性数学表达式、由此从该模型中给出了 2 0℃时的高纯度铝( 99 999%～ 99.99999%)的密度值，其结果令人满意。

The derivation course and the discrete scheme of the first model-Perona-Malik model have been expatiated on emphasis. One item of the P-M model is omitted in the P-M's discrete scheme, and the gradient magnitude is replaced by the absolute value of difference quotient.

Perona-Malik给出的离散格式是一种显式离散格式，这一格式的连续形式省略了原模型中的一项，且用差商的绝对值代替了梯度模。

According to the characteristic of the discrete variable structure, the optimization of the space truss is analyzed by the difference-quotient-method.

针对离散变量结构的特点，本文采用差商法对网架结构进行优化设计。

The magnetotelluric data are simulated by usingrecursion formula for 1-D layered medium, and partial derivatives are computed bytaking difference quotient method.

由于不同的数据集具有不同的物理空间和数量级，必须作归一化处理，引入相对预测误差向量，为此，文中给出一种求解不适定问题的方法。

Memory quotient in unmedicated group showed no significant difference as compared with control group, but the digit span and visual reproduction subtest scores in TS group were signifi- cantly lower than those in control group.

未用药组的记忆商与对照组相比无显著差异，TS组的背数和视觉再生分测验量表分显著低于对照组，提示TS患儿总的记忆功能正常，但其记忆模式中的瞬时记忆和短时记忆可能存在一定的缺陷。

The training phase lasted 3 weeks, then performance test were carried out. Results: A decline in Respiratory quotient was observed in ketogenic diet fed animals in comparison to chow fed animals (P.05), whilst energy expenditure did not differ. No significant difference were observed in running distance and lasting time.

结果：生酮饲料喂养大鼠的呼吸商显著低于用基础饲料的对照组(P.05)；代谢率略高于对照组，但差异无显著性；生酮饲料干预动物与对照组动物在跑步距离和时间方面的能力差异无显著性。

Substantial collagenous fibril proliferation at the inner side and around the endoneurium was also observed.

电镜下，雪旺细胞出现在神经内膜管内，神经内膜管下及内膜管周围有大量胶原原纤维增生。

Those who can not all tofu is also sold out, so I then left into the fermented bean curd tofu marinated.

那些豆腐也不可能全部卖完，于是我再把剩下的豆腐腌制成腐乳。