[SciPy-User] How does “line search failed” affect the optimization?

[Ziyuan Lin]

Hi all,

I am using scipy.optimize.minimize for my optimization problem. 
Specifically, I tried solvers "L-BFGS-B" and "TNC", but both give me 
"Linear search failed"-like messages on my problem. What is the reason of 
the failure of the line search on these solvers? Does it mean that the 
final "optimal" value is potentially not optimal? Thank you.

Best regards,
Ziyuan
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