sampler

Documentation

Index

• type Source
• type Uniform
  • func NewDeterministicUniform(source Source) Uniform
  • func NewUniform() Uniform
• type Weighted
  • func NewWeighted() Weighted
• type WeightedWithoutReplacement
  • func NewDeterministicWeightedWithoutReplacement(source Source) WeightedWithoutReplacement
  • func NewWeightedWithoutReplacement() WeightedWithoutReplacement

Types

type Source

type Source interface {
	// Uint64 returns a random number in [0, MaxUint64] and advances the
	// generator's state.
	Uint64() uint64
}

type Uniform

type Uniform interface {
	Initialize(sampleRange uint64)
	// Sample returns length numbers in the range [0,sampleRange). If there
	// aren't enough numbers in the range, false is returned. If length is
	// negative the implementation may panic.
	Sample(length int) ([]uint64, bool)

	Next() (uint64, bool)
	Reset()
}

Uniform samples values without replacement in the provided range

func NewDeterministicUniform

func NewDeterministicUniform(source Source) Uniform

NewDeterministicUniform returns a new sampler

func NewUniform

func NewUniform() Uniform

NewUniform returns a new sampler

type Weighted

type Weighted interface {
	Initialize(weights []uint64) error
	Sample(sampleValue uint64) (int, bool)
}

Weighted defines how to sample a specified valued based on a provided weighted distribution

func NewWeighted

func NewWeighted() Weighted

type WeightedWithoutReplacement

type WeightedWithoutReplacement interface {
	Initialize(weights []uint64) error
	Sample(count int) ([]int, bool)
}

WeightedWithoutReplacement defines how to sample weight without replacement. Note that the behavior is to sample the weight without replacement, not the indices. So duplicate indices can be returned.

func NewDeterministicWeightedWithoutReplacement

func NewDeterministicWeightedWithoutReplacement(source Source) WeightedWithoutReplacement

NewDeterministicWeightedWithoutReplacement returns a new sampler

func NewWeightedWithoutReplacement

func NewWeightedWithoutReplacement() WeightedWithoutReplacement

NewWeightedWithoutReplacement returns a new sampler