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Lookalike Models

Fiddler’s explainability features require a model on the backend that can generate explanations for you.

A lookalike model is an approximation of your model using gradient boosted trees (LightGBM), trained with a general, predefined set of hyperparameters. It serves as a way for Fiddler to generate approximate explanations without you having to upload your actual model artifact.


A lookalike model will be built automatically for you when you call register_model. You just need to provide a few pieces of information about how your model operates.

What you need to specify:

  • Your model’s task (regression, binary classification, etc.)
  • Your model’s target column (ground truth labels)
  • Your model’s output column (model predictions)
  • Your model’s feature columns
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