AggregatorImpls.AggregableCountUnique (datavec-api 1.0.0-M2.1 API)

java.lang.Object
- org.datavec.api.transform.ops.AggregatorImpls.AggregableCountUnique<T>

Type Parameters:

T -

All Implemented Interfaces:

Serializable, IAggregableReduceOp<T,Writable>, Consumer<T>, Supplier<Writable>

Enclosing class:

AggregatorImpls
```
public static class AggregatorImpls.AggregableCountUnique<T>
extends Object
implements IAggregableReduceOp<T,Writable>
```
This distinct count is based on streamlib's implementation of "HyperLogLog in Practice: Algorithmic Engineering of a State of The Art Cardinality Estimation Algorithm", available here. The relative accuracy is approximately `1.054 / sqrt(2^p)`. Setting a nonzero `sp > p` in HyperLogLogPlus(p, sp) would trigger sparse representation of registers, which may reduce the memory consumption and increase accuracy when the cardinality is small.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

AggregableCountUnique(float precision)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`accept(T element)`
`<U extends IAggregableReduceOp<T,Writable>> void`	`combine(U acc)`
`Writable`	`get()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AggregableCountUnique
```
public AggregableCountUnique(float precision)
```
- Method Detail
  - accept
```
public void accept(T element)
```
    Specified by:
    
    accept in interface Consumer<T>
  - combine
```
public <U extends IAggregableReduceOp<T,Writable>> void combine(U acc)
```
    Specified by:
    
    combine in interface IAggregableReduceOp<T,Writable>
  - get
```
public Writable get()
```
    Specified by:
    
    get in interface Supplier<T>