func (m *Minhash) hash(v FeatureVector) *bit.Vector {
bitNum := m.data.BitNum()
minValues := generateMinValuesBuffer(bitNum)
hashes := make([]uint64, bitNum)
for i := range v {
dim := v[i].Dim
x := v[i].Value
keyHash := calcStringHash(dim)
for j := 0; j < bitNum; j++ {
hashVal := calcHash(keyHash, uint64(j), x)
if hashVal < minValues[j] {
minValues[j] = hashVal
hashes[j] = keyHash
}
}
}
bv := bit.NewVector(bitNum)
for i := 0; i < len(hashes); i++ {
if (hashes[i] & 1) == 1 {
bv.Set(i)
}
}
return bv
}
func binarize(proj []float32) *bit.Vector {
ret := bit.NewVector(len(proj))
for i, x := range proj {
if x > 0 {
ret.Set(i)
}
}
return ret
}