public abstract static class TDigestQuantiles.GlobalDigest extends PTransform<PCollection<java.lang.Double>,PCollection<com.tdunning.math.stats.MergingDigest>>
TDigestQuantiles.globally()
.name, resourceHints
Constructor and Description |
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GlobalDigest() |
Modifier and Type | Method and Description |
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PCollection<com.tdunning.math.stats.MergingDigest> |
expand(PCollection<java.lang.Double> input)
Override this method to specify how this
PTransform should be expanded on the given
InputT . |
TDigestQuantiles.GlobalDigest |
withCompression(double cf)
Sets the compression factor
cf . |
compose, compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setResourceHints, toString, validate
public TDigestQuantiles.GlobalDigest withCompression(double cf)
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.
cf
- the bound value for centroid and digest sizes.public PCollection<com.tdunning.math.stats.MergingDigest> expand(PCollection<java.lang.Double> input)
PTransform
PTransform
should be expanded on the given
InputT
.
NOTE: This method should not be called directly. Instead apply the PTransform
should
be applied to the InputT
using the apply
method.
Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).
expand
in class PTransform<PCollection<java.lang.Double>,PCollection<com.tdunning.math.stats.MergingDigest>>