FinalStepImpl  
    class FinalStepImpl<T, R>(val featureExtractionStep: FeatureExtractorBuilder.FeatureExtractionStep<T>, val featureExtraction: (T) -> Option<R>, val featureExpectOptions: FeatureExpectOptions<R>) : FeatureExtractorBuilder.FinalStep<T, R> (source)
Constructors
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                  constructor(featureExtractionStep: FeatureExtractorBuilder.FeatureExtractionStep<T>, featureExtraction: (T) -> Option<R>, featureExpectOptions: FeatureExpectOptions<R>)
Functions
Properties
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                  Either the previously specified FeatureExpectOptions or null.
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                  The previously specified feature extraction lambda.
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                  The so far chosen options up to the FeatureExtractionStep step.