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From Frank McQuillan <fmcquil...@pivotal.io>
Subject Re: MADlib's Random Forest Classification and Regression Example
Date Wed, 13 Jul 2016 19:32:46 GMT
Hi Nurur,

Thanks for the question.  I just re-ran those examples on my local machine
on a recent version of Postgres and they seemed to work fine for me.

Your email says:

"PostgreSQL 8.2.15

(Greenplum Database 4.2.0 build 1)

(HAWQ 1.3.0.0 build 12954)"


Which platform did you see the error on?


Frank





On Wed, Jul 13, 2016 at 8:07 AM, Nurur Rahman <nurur_rahman@glic.com> wrote:

> Hello,
>
> I am going through Random Forest example given in MADlib's User
> Documentation:
>
>
> http://madlib.incubator.apache.org/docs/latest/group__grp__random__forest.html#examples
>
>
>
> In both cases when I run “SELECT madlib.forest_train( … … )” exactly as it
> is shown in
>
> steps 1 and 2 in the example page, I get the following error:
>
>
>
> ERROR:  plpy.SPIError: Function
> "madlib._dt_apply(madlib.bytea8,madlib.bytea8,madlib.bytea8,smallint,smallint,smallint,boolean,integer)":
> Invalid type conversion. Simple type supplied but backend expects composite
> type. (plpython.c:4648)
>
> CONTEXT:  Traceback (most recent call last):
>
>   PL/Python function "forest_train", line 39, in <module>
>
>     sample_ratio
>
>   PL/Python function "forest_train", line 553, in forest_train
>
>   PL/Python function "forest_train", line 2192, in _tree_train_using_bins
>
>   PL/Python function "forest_train", line 1162, in _one_step
>
> PL/Python function "forest_train"
>
>
>
>
>
>
>
> Relevant Info:
>
> "PostgreSQL 8.2.15
>
> (Greenplum Database 4.2.0 build 1)
>
> (HAWQ 1.3.0.0 build 12954)
>
>
>
> "MADlib version: 1.9, git revision: rc/v1.9-rc1
>
>
>
>
>
> Can anyone please explain what the reasons behind this error message? Your
> help will be appreciated.
>
>
>
>
>
> Thanks.
>
> Nurur
>
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