feature elimination Node / Decision Tree Prediction failed

KNIME Analytics Platform
#1

Hello,

I have a problem with the feature elimination Node. It stops with the following fault:

 

WARN  DecisionTreeNodeSplitPMML   Decision Tree Prediction failed. Could not find branch for row 'Row45839: …

WARN  Backward Feature Elimination Filter     No features selected yet

ERRORBackward Feature Elimination End  Execute failed: This node cannot handle missing values

 

What am I doing wrong?

Thanks

Marvin

#2

Hi Marvin,

if seems that the domain of your training data for the decision tree does not match the domain of the input data for the decision tree predictor. For a data row with "new" values it is possible that the decision tree predictor cannot perform a prediction and hence returns a missing value as prediction which cannot be handled by the feature elimination node.

The easiest workaround for you is to append a "Missing Value" node to the predictor and remove the rows with missing values.

Dominik