
n. [数] 下降法
The corresponding adaptive algorithm was derived based on the steepest descent method.
基于最陡下降方法,推导出了相应的自适应算法。
BP neural network, as its nature of gra***nt descent method, is easy to fall into local optimum.
但BP神经网络本质是梯度下降法,容易陷入局部最优。
The algorithm of studying bases on the foundation of the descent method most rapidly, and was improved.
学习算法在最速下降法的基础上给出,并加以改进。
Moreover, the demand of producing large-scale sapphires by the molybdenum crucible through the descent method is met.
满足了钼坩埚下降法生产大尺寸蓝宝石的需求。
The weights are trained with Gra***nt Descent Method. The increase algorithm of BVS, and restricted algorithm, was induced.
利用梯度下降法对网络的权值进行训练,并且推导了BVS的增长算法,以及网络训练的限制记忆递推公式。
"Descent method"(下降法)是数学优化领域的核心概念,指通过迭代逐步逼近函数最小值的算法族。其核心原理是:在每次迭代中沿特定方向移动,确保目标函数值持续减小。以下是关键解析:
数学定义
对于目标函数 ( f(x) ),迭代公式为:
$$
x_{k+1} = x_k + alpha_k d_k
$$
其中:
收敛条件
当梯度 (
abla f(x_k) ) 趋近于零或函数值变化小于阈值时,算法终止。
方法类型 | 核心特点 | 典型算法 |
---|---|---|
一阶方法 | 仅用梯度信息,计算简单 | 梯度下降法、最速下降法 |
二阶方法 | 利用Hessian矩阵,收敛更快 | 牛顿法、拟牛顿法 |
随机方法 | 处理大规模数据,降低计算成本 | 随机梯度下降(SGD) |
动量法 | 引入历史梯度信息,加速收敛 | Nesterov加速梯度法 |
若需了解具体算法的实现细节(如步长选择策略、预处理技术),可进一步说明应用场景,我将提供针对性补充。
动词
从高处到低处移动。例句:The plane began to descend towards the runway.(飞机开始向着跑道降落)
降低水平或程度。例句:The temperature will descend below freezing tonight.(今晚温度将下降到冰点以下)
(状况、道德、质量等)逐渐恶化。例句:The situation in the country has descended into chaos.(这个国家的局势已经陷入混乱)
(人或动物)遗传下来,血统传承。例句:She is descended from a long line of doctors. (她是一系列医生的后代)
drop, sink, fall, decline
ascend, rise, climb, improve
名词
一种特定的做事方式或途径。例句:We need to find a new method to solve this problem.(我们需要找到一种新的方法来解决这个问题)
一种科学、哲学或艺术的研究方法。例句:The scientific method involves observation, hypothesis, and experimentation.(科学方法包括观察、假设和实验)
一种有条理、系统的行动方式或指导思想。例句:The company has a strict method for evaluating employee performance.(公司有一套严格的评估员工绩效的方法)
approach, technique, system, procedure
disorder, confusion, randomness, chaos
shopkeeperknobGuinness Book of World Recordspermanentlyblissfullypricklingvoltsbags ofby railcoal fired boilercyclic loadingglad to see youpacking machinethin sliceActinomycetaceaebirderbrobdingnagianbronchiabubbingcavilercoconspiratordihydroandrosteroneduckpinsEcclesiasticusendomorphismFrankfortfreebooterhydroxoniumhypometamorphiclymphadenogram