class n. 1.阶级;社会等级。 2.学级;班级,年级,级,班;组;(有组织的)讲习班;〔美国〕同年毕业班;【军事】同年入伍士兵。 3.(高低、优劣的)等级;类别。 4.〔英大学〕(荣誉考试)优等;〔俚语〕高级,优秀;漂亮,优雅。 5.【生物学】(分类学的)纲;【矿物】晶族。 6.(一节)课。 the working class工人阶级。 No class today. 今天没课。 C- is over. 下课。 boycott classes 罢课。 the first [second] class头[二]等。 high [low] class高[低]级。 There's a good deal of class about him. 他有很多优点。 He is not class enough. 他没有什么了不起。 at the top of one's class 出类拔萃;居首要位置。 be no class 〔俚语〕不足道;无价值。 class of the field 〔美国〕比赛的优胜候补人。 get a class=obtain a class. in a class by itself 特好,出众。 in class在上课中。 in the same class 〔美国〕同一类型的,同等的。 no class 〔俚语〕等外的,极坏的,蹩脚的〔用作表语〕。 not in the same class with 不能同…相比,无法和…相提并论,比不上…。 obtain a class=take a class 毕业考试得优等。 take a class at (Oxford) 在(牛津大学)进荣誉班。 take a class of (beginners) 担任(初级)班(的教师)。 take classes in (history) 听(历史)课,选修(历史)课程。 the classes 上层社会;知识阶级。 the classes and masses 各阶级和各阶层。 vt. 把…分类,把…分等[分级];给…定等级,把…分组。 vi. 属于…类[等、级、组]。 adj. -able 可分类[等级]的。 adj. -less 无阶级的。
A class of algorithms for unconstrained nondifferentiable programming 一类无约束不可微规划算法
Firstly , this thesis introduces the present situation of the research and methods of medical image registration . the major classes of algorithms and relative techniques are reviewed and several specific examples of each class of algorithm are described 本文首先介绍了医学图像配准研究的现状和方法,对各类配准算法及其相关技术进行了综述,并大量分析了各类方法的不同应用实例。
In this paper , a class of algorithms which are update quasi - newton methods for unconstrained optimization as follows : this article consists , of three parts . the first part is the introduction of the quasi - newton methods for unconstrained optimization . the second part is the proof of the global and superlin - early convergence of the generalized - quasi - newton methods . the third part is quasi - newton - non - convex class methods and its global convergence . the main results of the second part are as follows : theorem of global convergence 在第一章中,主要是根据焦宝聪提出的广义拟牛顿算法,对目标函数放宽了条件限制,结合goldstein线性搜索,对一般目标函数进行了收敛性的讨论,其主要结果如下:全局收敛性定理若f ( x )在r ~ n上二次连续可微,有下界,水平集。