func (stwv *StringToWordVector) normalizeInstance(inst *data.Instance, firstCopy int) {
//fmt.Println("firstcopy ", firstCopy)
//fmt.Println("avgdoclength ", stwv.avgDocLength)
docLength := float64(0)
if stwv.avgDocLength < 0 {
panic("Average document length not set.")
}
// fmt.Println("valores: ", inst.RealValues())
// Compute length of document vector
for j := 0; j < len(inst.RealValues()); j++ {
if inst.Indices()[j] >= firstCopy {
docLength += inst.RealValues()[j] * inst.RealValues()[j]
}
}
docLength = math.Sqrt(docLength)
// Normalize document vector
for j := 0; j < len(inst.RealValues()); j++ {
if inst.Indices()[j] >= firstCopy {
val := inst.RealValues()[j] * stwv.avgDocLength / docLength
inst.AddRealValuesIndex(j, val)
if val == 0 {
fmt.Println("Setting value %d to zero", inst.Indices()[j])
j--
}
}
}
}
