R help - Dec 2019 - all the MAE metric values are missing (Error message)

Hi Jim

The objective function is passed to san_res where we have defined the 4
parameters of gbm and the values are initialized in san_res.

The output variable price has only three values: 0, 1, 2 (like categorical
values), so someone told me try to remove the log10 from the price.

I am not sure what to do, I spent two days but did not fix this issue.


On Sun, Dec 22, 2019 at 11:22 PM Jim Lemon <drjimlemon at gmail.com>
wrote:
> Hi Neha,
> The error message looks suspicious, as it refers to "all the
MAEs"
> while there is only one NA value in the summary. I would carefully
> check the object that you are passing to san_res.
>
> Jim
>
> On Mon, Dec 23, 2019 at 4:17 AM Neha gupta <neha.bologna90 at
gmail.com>
> wrote:
> >
> > I am using the following code to tune the 4 parameters of Gradient
> Boosting
> > algorithm using Simulated annealing (optim). When I run the program,
> after
> > few seconds it stops and displays the following error:
> >
> > I point out here that the same code works for RF ( mtry parameter) and
> SVM
> > (cost and sigma parameters). So, I guess the problem should be in the
4
> > parameters of GBM
> >
> > Something is wrong; all the MAE metric values are missing:
> >       RMSE        Rsquared        MAE
> >  Min.   : NA   Min.   : NA   Min.   : NA
> >  1st Qu.: NA   1st Qu.: NA   1st Qu.: NA
> >  Median : NA   Median : NA   Median : NA
> >  Mean   :NaN   Mean   :NaN   Mean   :NaN
> >  3rd Qu.: NA   3rd Qu.: NA   3rd Qu.: NA
> >  Max.   : NA   Max.   : NA   Max.   : NA
> >  NA's   :1     NA's   :1     NA's   :1
> >
>
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Hi Neha,
Well, that's a clue to why you are getting NAs:

log10(0)
[1] -Inf

Another possibility is that the values used in the initial calculation
have been read in as factors.

Jim

On Mon, Dec 23, 2019 at 10:55 AM Neha gupta <neha.bologna90 at gmail.com>
wrote:
>
> Hi Jim
>
> The objective function is passed to san_res where we have defined the 4
parameters of gbm and the values are initialized in san_res.
>
> The output variable price has only three values: 0, 1, 2 (like categorical
values), so someone told me try to remove the log10 from the price.
>

Hi Jim,

Another possibility is that the values used in the initial calculation
have been read in as factors

Which calculation you are talking about? I did not use factors as variable.

Regards

On Mon, Dec 23, 2019 at 3:12 AM Jim Lemon <drjimlemon at gmail.com> wrote:
> Hi Neha,
> Well, that's a clue to why you are getting NAs:
>
> log10(0)
> [1] -Inf
>
> Another possibility is that the values used in the initial calculation
> have been read in as factors.
>
> Jim
>
> On Mon, Dec 23, 2019 at 10:55 AM Neha gupta <neha.bologna90 at
gmail.com>
> wrote:
> >
> > Hi Jim
> >
> > The objective function is passed to san_res where we have defined the
4
> parameters of gbm and the values are initialized in san_res.
> >
> > The output variable price has only three values: 0, 1, 2 (like
> categorical values), so someone told me try to remove the log10 from the
> price.
> >
>
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