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单词 Steepest ascent
释义

Steepest ascent

原声例句
海蒂

They still had to climb a steep ascent that lay behind Peter's hut.

他们还得爬上彼得小屋后面的陡坡。

消失的地平线

Mallinson, whom the steep ascent had kept silent for a time, gasped out: " Good man, we're doing fine-carry on" !

陡峭的上坡让他沉默了一段时间的马林森喘着气说:“好人,我们做得很好——继续前进”!

海蒂

The grandfather had brought a big basket with him, in which he carried half the contents of Heidi's trunk; it had been too large to be conveyed up the steep ascent.

祖父随身带了一个大篮子,里面装着海蒂行李箱里一半的东西。它太大了,无法运送到陡峭的斜坡上。

三个神秘人

But the boundary of all was a great wall of mountain, vast in the west, and ending like a fortress with a steep ascent and a domed tumulus clear against the sky.

但一切的边界是一堵巨大的山墙,西部广阔,尽头像一座堡垒,陡峭的坡度和穹顶的古墓映衬着天空。

加州的群山(上)

All the passes make their steepest ascents on the eastern flank. On this side the average rise is not far from a thousand feet to the mile, while on the west it is about two hundred feet.

所有的隘口都在东翼上升最陡。在这边,平均上升距离从一千英尺到一英里不远,而在西边大约有两百英尺。

中文百科

梯度下降法 Gradient descent

(重定向自Steepest ascent)
梯度下降法的描述。

梯度下降法英语:Gradient descent)是一个最优化算法,通常也称为最速下降法

梯度下降法,基于这样的观察:如果实值函数F(\mathbf{x})在点\mathbf{a}处可微且有定义,那幺函数F(\mathbf{x})\mathbf{a}点沿着梯度相反的方向 -\nabla F(\mathbf{a}) 下降最快。

因而,如果

对于\gamma>0为一个够小数值时成立,那幺F(\mathbf{a})\geq F(\mathbf{b})

考虑到这一点,我们可以从函数F的局部极小值的初始估计\mathbf{x}_0出发,并考虑如下串行 \mathbf{x}_0, \mathbf{x}_1, \mathbf{x}_2, \dots使得

英语百科

Gradient descent 梯度下降法

(重定向自Steepest ascent)
Illustration of gradient descent on a series of level sets.

Gradient descent is a first-order optimization algorithm. To find a local minimum of a function using gradient descent, one takes steps proportional to the negative of the gradient (or of the approximate gradient) of the function at the current point. If instead one takes steps proportional to the positive of the gradient, one approaches a local maximum of that function; the procedure is then known as gradient ascent.

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更新时间:2025/6/23 7:01:29