[jira] [Updated] (MADLIB-835) Improved error message for Elastic Net predict()

["Frank McQuillan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MADLIB-835?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Frank McQuillan updated MADLIB-835:
-----------------------------------
    Labels: starter  (was: gsoc2016 starter)

> Improved error message for Elastic Net predict()
> ------------------------------------------------
>
>                 Key: MADLIB-835
>                 URL: https://issues.apache.org/jira/browse/MADLIB-835
>             Project: Apache MADlib
>          Issue Type: Bug
>            Reporter: Srivatsan
>            Priority: Minor
>              Labels: starter
>
> When we pass the selected coefficients to elastic net's "predict()" function, it throws as ugly error message which is not indicative of the real error.
> {noformat}
> NOTICE:  table "regression_elastic_net_predictions" does not exist, skipping
> ERROR:  Function "madlib.elastic_net_gaussian_predict(double precision[],double precision,double precision[])": Internal error. Eigen assertion failed (index >= 0 && index < size()) in function typename Eigen::internal::conditional<(bool)((Eigen::internal::traits<T>::Flags & Eigen::LvalueBit)), const typename Eigen::internal::traits<T>::Scalar&, typename Eigen::internal::conditional<Eigen::internal::is_arithmetic<typename Eigen::internal::traits<T>::Scalar>::value, typename Eigen::internal::traits<T>::Scalar, const typename Eigen::internal::traits<T>::Scalar>::type>::type Eigen::DenseCoeffsBase<Derived, 0>::operator()(typename Eigen::internal::traits<T>::Index) const [with Derived = Eigen::Map<const Eigen::Matrix<double, -0x00000000000000001, 1, 0, -0x00000000000000001, 1>, 0, Eigen::Stride<0, 0> >] at /data/home/gpdbchina/pulse2-data/agents/agent1/work/MADlib%20Build%20%28Release%29/rhel5_x86_64/build/third_party/src/EP_eigen/Eigen/src/Core/DenseCoeffsBase.h:173 (UDF_impl.hpp:208)  (seg40 sdw6:1025 pid=21706) (cdbdisp.c:1477)
> DETAIL:  PL/pgSQL function "elastic_net_predict" line 8 at return
> {noformat}
> The error is in passing "coef_nonzero" as input instead of "coef_all" from the model.
> {noformat}
> 	select test.person_uid, 
> 			       test.gpa as actual_gpa,
> 			       madlib.elastic_net_predict(
> 				    'gaussian', 
> 				    mdl.coef_nonzero, 
> 				    mdl.intercept, 
> 				    feat_vect_normalized
> 			       ) as predicted_gpa
> 			from modeling.regression_test test, 
> 			     modeling.regression_elastic_net_mdl mdl
> {noformat}



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