线性搜索的正方向导数 [英] Positive directional derivative for linesearch

问题描述

scipy.optimize 'Positive Direction Derivative for linesearch' 的 smode 是什么意思?

What does the smode of scipy.optimize 'Positive directional derivative for linesearch' mean?

例如在 fmin_slsqphttp://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.fmin_slsqp.html

for example in fmin_slsqp http://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.fmin_slsqp.html

推荐答案

这些优化算法的工作方式通常是选择一个下降方向，然后对该方向执行线搜索.我认为这条消息意味着优化器进入了一个位置，它无法找到目标函数值减小的方向(足够快)，但也无法验证当前位置是否为最小值.

These optimization algorithms typically work by choosing a descent direction, and then performing a line search to that direction. I think this message means that the optimizer got into a position where it did not manage to find a direction where the value of the objective function decreases (fast enough), but could also not verify that the current position is a minimum.

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