Packages

c

com.linkedin.feathr.common.featurizeddataset

SparkDeserializerFactory

final class SparkDeserializerFactory extends AnyRef

A converter from FDS Spark objects to TensorData. Instead of creating a new memory copy, a thin wrapper (view) around the Spark structure is created. This reduces GC pressure, but some operations (e.g., cardinality or isEmpty) are more expensive than usual.

For working with individual feature values, use #getFeatureDeserializer.

NOTE that this class directly operates with scala.collection.Seq values coming from Spark DataFrame. An alternative would be converting those to java.util.List, but given the performance requirements of this class, that was not chosen.

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