org.apache.beam.sdk.extensions.sketching

Class TDigestQuantiles.PerKeyDigest<K>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,java.lang.Double>>,org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,com.tdunning.math.stats.MergingDigest>>>

org.apache.beam.sdk.extensions.sketching.TDigestQuantiles.PerKeyDigest<K>

All Implemented Interfaces:

java.io.Serializable, org.apache.beam.sdk.transforms.display.HasDisplayData

Enclosing class:

TDigestQuantiles

public abstract static class TDigestQuantiles.PerKeyDigest<K>
extends org.apache.beam.sdk.transforms.PTransform<org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,java.lang.Double>>,org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,com.tdunning.math.stats.MergingDigest>>>

Implementation of TDigestQuantiles.perKey().

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

name, resourceHints

Constructor Summary

Constructors

Constructor and Description
PerKeyDigest()

Method Summary

Modifier and Type	Method and Description
org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,com.tdunning.math.stats.MergingDigest>>	expand(org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,java.lang.Double>> input)
TDigestQuantiles.PerKeyDigest<K>	withCompression(double cf) Sets the compression factor cf.

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

compose, compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setResourceHints, toString, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PerKeyDigest

public PerKeyDigest()

Method Detail

withCompression

public TDigestQuantiles.PerKeyDigest<K> withCompression(double cf)

Sets the compression factor cf.

Keep in mind that a compression factor cf of c guarantees a relative error less than 3/c at mid quantiles.
The accuracy will always be significantly less than 1% at extreme quantiles.

Parameters:

cf - the bound value for centroid and digest sizes.

expand

public org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,com.tdunning.math.stats.MergingDigest>> expand(org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,java.lang.Double>> input)

Specified by:

expand in class org.apache.beam.sdk.transforms.PTransform<org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,java.lang.Double>>,org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,com.tdunning.math.stats.MergingDigest>>>