线搜索的正方向导数 [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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