HashNHotWeightedEncoder

Transform a collection of weighted categorical features to columns of weight sums, with at most N values. Similar to NHotWeightedEncoder but uses MurmursHash3 to hash features into buckets to reduce CPU and memory overhead.

Weights of the same labels in a row are summed instead of 1.0 as is the case with the normal NHotEncoder.

If hashBucketSize is inferred with HLL, the estimate is scaled by sizeScalingFactor to reduce the number of collisions.

Rough table of relationship of scaling factor to % collisions, measured from a corpus of 466544 English words:

sizeScalingFactor     % Collisions
-----------------     ------------
                2     17.9934%
                4     10.5686%
                8      5.7236%
               16      3.0019%
               32      1.5313%
               64      0.7864%
              128      0.3920%
              256      0.1998%
              512      0.0975%
             1024      0.0478%
             2048      0.0236%
             4096      0.0071%

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Serializable, Serializable, AnyRef, Any

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final def !=(arg0: Any): Boolean

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final def ##(): Int

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final def ==(arg0: Any): Boolean

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def apply(name: String, hashBucketSize: Int = 0, sizeScalingFactor: Double = 8.0): Transformer[Seq[WeightedLabel], HLL, Int]

Create a new HashNHotWeightedEncoder instance.
Create a new HashNHotWeightedEncoder instance.
hashBucketSize
number of buckets, or 0 to infer from data with HyperLogLog
sizeScalingFactor
when hashBucketSize is 0, scale HLL estimate by this amount
final def asInstanceOf[T0]: T0

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def clone(): AnyRef

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protected[java.lang]
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@throws( ... )
final def eq(arg0: AnyRef): Boolean

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def equals(arg0: Any): Boolean

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def finalize(): Unit

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protected[java.lang]
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@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

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def hashCode(): Int

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final def isInstanceOf[T0]: Boolean

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final def ne(arg0: AnyRef): Boolean

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final def notify(): Unit

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final def notifyAll(): Unit

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final def synchronized[T0](arg0: ⇒ T0): T0

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def toString(): String

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final def wait(): Unit

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final def wait(arg0: Long, arg1: Int): Unit

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final def wait(arg0: Long): Unit

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Related Doc: package transformers

object HashNHotWeightedEncoder extends Serializable

Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

def apply(name: String, hashBucketSize: Int = 0, sizeScalingFactor: Double = 8.0): Transformer[Seq[WeightedLabel], HLL, Int]

final def asInstanceOf[T0]: T0

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def synchronized[T0](arg0: ⇒ T0): T0

def toString(): String

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

Inherited from Serializable

Inherited from Serializable

Inherited from AnyRef

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