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Hi team dataiku,

How do you swap the "positive" and the "negative" classes in the confusion matrix of a binary classifier (and get the right Precision and Recall values) ?

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By convention, the rarest class is the "positive" class in binary classification.

There is an override for binary-looking values:

  • yes/no
  • true/false
  • 0/1 or 0.0/1.0
  • ok/nok

You can use the Script tab of an Analysis to add preparation steps before training model (e.g. find and replace) so that your target column matches one of those, then re-create a prediction task (or in your existing task's settings, click Learning taks > Redetect settings).

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I did what you said and changed my 'OK' class with something else to prevent DSS from being fooled.

Thank you !
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