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

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Labels: starter
• Assignee: Unassigned
• Reporter: Srivatsan Ramanujam
• Created: 04/Jun/14 02:03
• Updated: 20/Jun/17 23:38

Description

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.

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

The error is in passing "coef_nonzero" as input instead of "coef_all" from the model.

	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

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