求翻译：BP神经网络通常采用BP算法，但是标准的梯度下降算法和有动量的梯度下降应用于实际问题时往往存在学习速率过慢的缺陷，而且也容易陷入局部极小点，因而人们提出了很多种改进的高效BP算法。是什么意思？

BP neural network BP algorithm commonly used, but the standard gradient descent algorithm and gradient descent with momentum, when applied to practical problems there is often too slow learning rate of defects, but also easy to fall into local minima, which are many improvements have been proposed e

BP BP neural network algorithms are usually used in the gradient, but standard algorithm and the momentum of the drop in gradient applied to practical problems, there is often too slow speed learning deficiencies, but also tend to fall into partial minimal points have been raised, and thus many type

The BP neural network usually uses the BP algorithm, when often the standard gradient drop algorithm and has the momentum gradient drops applies in the actual problem has the study speed excessively slow flaw, moreover also easy to fall into the partial minimum point, thus the people proposed the ve

BP usually uses the BP neural network algorithm, but standard gradient descent algorithms and gradient descent with momentum when applied to real problems there is often slow learning rate of defects, but also vulnerable local minimum points, which have been proposed lots of efficient BP algorithm i

BP nerve network usually adopts BP algorithm, but the standard gradient drops algorithm and gradient to have momentum and drops and often studies the defect of slow speed while applying to the practical problem, and apt to fall into extremely some snack, therefore people propose a lot kinds of impro