However, BP network with gradient descent has some defects such as low convergence speed, fall in local minima.

然而基于梯度下降的BP网络存在收敛速度慢、易陷入局部极小的缺陷。

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There has been an ongoing debate between experts over the steepness and speed of any forthcoming fall in house prices.

BBC: NEWS | Business | Q&A: Have house prices peaked?

It also showed that we seem to be putting history behind us more quickly, judging by the speed with which terms fall out of use.

WSJ: Culturomics Looks at the Birth and Death of Words

In this new world companies will rise and fall with unprecedented speed.

FORBES: Groupon��an Ordinary Company for a Revolutionary New Era