Class/Object

com.twitter.algebird

TopKMonoid

Related Docs: object TopKMonoid | package algebird

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class TopKMonoid[T] extends Monoid[TopK[T]]

A top-k monoid that is much faster than SortedListTake equivalent to: (left ++ right).sorted.take(k) but doesn't do a total sort If you can handle the mutability, mutable.PriorityQueueMonoid is even faster.

NOTE!!!! This assumes the inputs are already sorted! resorting each time kills speed

Linear Supertypes
Monoid[TopK[T]], AdditiveMonoid[TopK[T]], cats.kernel.Monoid[TopK[T]], Semigroup[TopK[T]], AdditiveSemigroup[TopK[T]], cats.kernel.Semigroup[TopK[T]], Serializable, Serializable, AnyRef, Any
Ordering
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  2. By Inheritance
Inherited
  1. TopKMonoid
  2. Monoid
  3. AdditiveMonoid
  4. Monoid
  5. Semigroup
  6. AdditiveSemigroup
  7. Semigroup
  8. Serializable
  9. Serializable
  10. AnyRef
  11. Any
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new TopKMonoid(k: Int)(implicit ord: Ordering[T])

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Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any

  3. final def ==(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

  4. def additive: algebra.Monoid[TopK[T]]

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    These are from algebra.Monoid

    These are from algebra.Monoid

    Definition Classes
    Monoid → AdditiveMonoid → Semigroup → AdditiveSemigroup

  5. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any

  6. def assertNotZero(v: TopK[T]): Unit

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    Definition Classes
    Monoid

  7. def build(ts: Iterable[T]): TopK[T]

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  8. def build(t: T): TopK[T]

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  9. def clone(): AnyRef

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  10. def combine(l: TopK[T], r: TopK[T]): TopK[T]

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    Definition Classes
    Semigroup → Semigroup

  11. def combineAll(t: TraversableOnce[TopK[T]]): TopK[T]

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    Definition Classes
    Monoid → Monoid

  12. def combineAllOption(as: IterableOnce[TopK[T]]): Option[TopK[T]]

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    Definition Classes
    Monoid → Semigroup

  13. def combineN(a: TopK[T], n: Int): TopK[T]

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    Definition Classes
    Monoid → Semigroup

  14. def empty: TopK[T]

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    Definition Classes
    Monoid → Monoid

  15. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef

  16. def equals(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

  17. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )

  18. final def getClass(): Class[_]

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    Definition Classes
    AnyRef → Any

  19. def hashCode(): Int

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    Definition Classes
    AnyRef → Any

  20. def isEmpty(a: TopK[T])(implicit ev: Eq[TopK[T]]): Boolean

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    Definition Classes
    Monoid

  21. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any

  22. def isNonZero(v: TopK[T]): Boolean

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    Definition Classes
    Monoid

  23. def isZero(a: TopK[T])(implicit ev: Eq[TopK[T]]): Boolean

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    Definition Classes
    AdditiveMonoid

  24. def merge(bigger: TopK[T], smaller: TopK[T]): TopK[T]

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    Attributes
    protected

  25. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef

  26. def nonZeroOption(v: TopK[T]): Option[TopK[T]]

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    Definition Classes
    Monoid

  27. final def notify(): Unit

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    Definition Classes
    AnyRef

  28. final def notifyAll(): Unit

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    Definition Classes
    AnyRef

  29. def plus(left: TopK[T], right: TopK[T]): TopK[T]

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    Definition Classes
    TopKMonoid → AdditiveSemigroup

  30. def positiveSumN(a: TopK[T], n: Int): TopK[T]

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    Attributes
    protected[this]
    Definition Classes
    AdditiveSemigroup

  31. def repeatedCombineN(a: TopK[T], n: Int): TopK[T]

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    Attributes
    protected[this]
    Definition Classes
    Semigroup

  32. def sum(vs: TraversableOnce[TopK[T]]): TopK[T]

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    Definition Classes
    Monoid → AdditiveMonoid

  33. def sumN(a: TopK[T], n: Int): TopK[T]

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    Definition Classes
    AdditiveMonoid → AdditiveSemigroup

  34. def sumOption(iter: TraversableOnce[TopK[T]]): Option[TopK[T]]

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    Returns an instance of T calculated by summing all instances in iter in one pass.

    Returns an instance of T calculated by summing all instances in iter in one pass. Returns None if iter is empty, else Some[ T].

    iter

    instances of T to be combined

    returns

    None if iter is empty, else an option value containing the summed T

    Definition Classes
    Semigroup
    Note

    Override if there is a faster way to compute this sum than iter.reduceLeftOption using plus.

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

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    Definition Classes
    AnyRef

  36. def toString(): String

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    Definition Classes
    AnyRef → Any

  37. def trySum(as: TraversableOnce[TopK[T]]): Option[TopK[T]]

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    Definition Classes
    AdditiveMonoid → AdditiveSemigroup

  38. final def wait(): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

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

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  40. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  41. lazy val zero: TopK[T]

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    Definition Classes
    TopKMonoid → AdditiveMonoid

Inherited from Monoid[TopK[T]]

Inherited from AdditiveMonoid[TopK[T]]

Inherited from cats.kernel.Monoid[TopK[T]]

Inherited from Semigroup[TopK[T]]

Inherited from AdditiveSemigroup[TopK[T]]

Inherited from cats.kernel.Semigroup[TopK[T]]

Inherited from Serializable

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

Ungrouped