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Allow only binary classifiers in OVA #2949

merged 1 commit into from Mar 14, 2019


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ganik commented Mar 13, 2019

fixes #2920

Gani Nazirov
@@ -628,7 +628,7 @@ private static ICalibratorTrainer GetCalibratorTrainerOrThrow(IExceptionContext
/// <param name="useProbabilities">Use probabilities (vs. raw outputs) to identify top-score category.</param>
/// <typeparam name="TModel">The type of the model. This type parameter will usually be inferred automatically from <paramref name="binaryEstimator"/>.</typeparam>
public static OneVersusAllTrainer OneVersusAll<TModel>(this MulticlassClassificationCatalog.MulticlassClassificationTrainers catalog,
ITrainerEstimator<ISingleFeaturePredictionTransformer<TModel>, TModel> binaryEstimator,
ITrainerEstimator<BinaryPredictionTransformer<TModel>, TModel> binaryEstimator,

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rogancarr Mar 14, 2019


BinaryPredictionTransformer [](start = 30, length = 27)

Might not be so easy because any given BinaryPredictionTransformer might not be an ISingleFeaturePredictionTransformer; from what I understand, OVA is currently limited to learners with single feature vectors (e.g. not FieldAwareFactorizationMachines). #Resolved

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ganik Mar 14, 2019

Author Member

Here is the definition for BinaryPredictionTransformer:

/// <summary>
/// Base class for the <see cref="ISingleFeaturePredictionTransformer{TModel}"/> working on binary classification tasks.
/// </summary>
/// <typeparam name="TModel">An implementation of the <see cref="IPredictorProducing{TResult}"/></typeparam>
public sealed class BinaryPredictionTransformer<TModel> : SingleFeaturePredictionTransformerBase<TModel>

so it looks like its a base transformer class for all ISingleFeaturePredictionTransformer and thats exactly what we need.

In reply to: 265408746 [](ancestors = 265408746)

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TomFinley left a comment

Thanks @ganik! This should help prevent people from feeding in the "wrong" types of models I hope.

@TomFinley TomFinley merged commit 6a4df7c into dotnet:master Mar 14, 2019

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rogancarr commented Mar 14, 2019

Broken build ! I'm fixing.

@rogancarr rogancarr referenced this pull request Mar 14, 2019


Updating OVA tests #2956

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