wmh

package
Version: v2.0.3 Latest Latest
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Published: Aug 12, 2019 License: Apache-2.0 Imports: 9 Imported by: 0

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type WeightedMinHasher

type WeightedMinHasher struct {
	// Size of each hash element in bits. Supported values are 16, 32 and 64.
	Bitness int
	// contains filtered or unexported fields
}

WeightedMinHasher calculates Weighted MinHash-es. https://ekzhu.github.io/datasketch/weightedminhash.html

func NewWeightedMinHasher

func NewWeightedMinHasher(dim int, sampleSize int, seed int64) *WeightedMinHasher

NewWeightedMinHasher initializes a new instance of WeightedMinHasher. `dim` is the bag size. `sampleSize` is the hash length. `seed` is the random generator seed, as Weighted MinHash is probabilistic.

func (*WeightedMinHasher) Hash

func (wmh *WeightedMinHasher) Hash(values []float32, indices []int) []uint64

Hash calculates the Weighted MinHash from the weighted bag of features. Each feature has an index and a value.

func (*WeightedMinHasher) MarshalBinary

func (wmh *WeightedMinHasher) MarshalBinary() (data []byte, err error)

MarshalBinary serializes the WeightedMinHasher.

func (*WeightedMinHasher) UnmarshalBinary

func (wmh *WeightedMinHasher) UnmarshalBinary(data []byte) error

UnmarshalBinary reads a WeightedMinHasher previously serialized with MarshalBinary().

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