org.apache.flink.api.java.sampling

类 PoissonSampler<T>

java.lang.Object

org.apache.flink.api.java.sampling.RandomSampler<T>

org.apache.flink.api.java.sampling.PoissonSampler<T>

类型参数:

T - The type of sample.

@Internal
public class PoissonSampler<T>
extends RandomSampler<T>

A sampler implementation based on the Poisson Distribution. While sampling elements with fraction and replacement, the selected number of each element follows a given poisson distribution.

另请参阅:

https://en.wikipedia.org/wiki/Poisson_distribution, Gap Sampling

字段概要

从类继承的字段 org.apache.flink.api.java.sampling.RandomSampler

emptyIterable, EPSILON

构造器概要

构造器

构造器和说明
PoissonSampler(double fraction) Create a poisson sampler which can sample elements with replacement.
PoissonSampler(double fraction, long seed) Create a poisson sampler which can sample elements with replacement.

方法概要

限定符和类型	方法和说明
Iterator<T>	sample(Iterator<T> input) Sample the input elements, for each input element, generate its count following a poisson distribution.

从类继承的方法 java.lang.Object

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

构造器详细资料

PoissonSampler

public PoissonSampler(double fraction,
                      long seed)

Create a poisson sampler which can sample elements with replacement.

参数:

fraction - The expected count of each element.

seed - Random number generator seed for internal PoissonDistribution.

PoissonSampler

public PoissonSampler(double fraction)

Create a poisson sampler which can sample elements with replacement.

参数:

fraction - The expected count of each element.

方法详细资料

sample

public Iterator<T> sample(Iterator<T> input)

Sample the input elements, for each input element, generate its count following a poisson distribution.

指定者:

sample 在类中 RandomSampler<T>

参数:

input - Elements to be sampled.

返回:

The sampled result which is lazy computed upon input elements.