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Re: fminuc problem

From: Kai Torben Ohlhus
Subject: Re: fminuc problem
Date: Sat, 25 May 2019 23:00:05 +0200

On Sat, May 25, 2019 at 3:23 PM madhav <address@hidden> wrote:
> Hi,
> I tried to find the optimum theta using fminunc function with rand initial 
> theta for simple logistic regression model(not NN). But i got the following 
> warning as,
>                              warning: division by zero
>                              warning: called from
>                                fminunc at line 288 column 15
> But it provided an output theta which when i verified taking the training set 
> as testing data and it gave utter incorrect results and hence the output 
> theta is not the optimum theta. But when i initialized the initial theta as 
> zero vector, i got the correct optimum theta. Hence this function works good 
> only for zero vector initialization. So there must be some bug in the code of 
> the function fminunc. Is there any alternative function for fminunc?

Can you provide a minimal complete working example, including the
version number of Octave and your operating system to reproduce the
issue?  Nothing in the documentation of fminunc [1] is called "theta".
Do you mean the starting guess "x0"?  Please be more precise with your
terminology (best by providing code).  Otherwise I cannot understand
and help you.

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