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com.linkedin.feathr.common

FeatureExtractor

trait FeatureExtractor[SOURCE_DATA] extends AnyRef

A feature extractor that extracts FeatureValue from source data. The class must have 0-argument constructor so Feathr engine can instantiate the class with 0-argument constructor. We expect this to replace Extractor eventually.

WARNING: This interface is in beta testing and is not approved for public use yet.

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@Experimental()
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ParameterizedFeatureExtractor
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Abstract Value Members

  1. abstract def batchExtract(featuresToExtract: Set[String], sourceData: SOURCE_DATA): Map[String, FeatureValue]

    Extract the set of features specified by featuresToExtract from the sourceData.

    Extract the set of features specified by featuresToExtract from the sourceData.

    featuresToExtract

    A set of features that this extractor will extract.

    sourceData

    The source data from your Feathr Source.

    returns

    A map of feature name to FeatureValue. For requested features that cannot be extracted, the expectation is that the result map will not contain entries of those features.

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  8. def extract(featureName: String, sourceData: SOURCE_DATA): FeatureValue

    Extract a single feature specified by featureName from sourceData.

    Extract a single feature specified by featureName from sourceData. If you only extract a single feature a time and it can be more performant than #batchExtract, you should implement this.

    featureName

    Feature name in the Feathr config.

    sourceData

    The source data from your Feathr Source.

    returns

    The FeatureValue associated with the requested feature name. When the requested feature cannot be extracted, null may be returned.

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