Golang Row.Clone Examples

Example #1

File: lnsmote.go Project: shuLhan/go-mining

//
// createSynthetic will create synthetics row from original row `p` and their
// `neighbors`.
//
func (in *Runtime) createSynthetic(p *tabula.Row, neighbors knn.Neighbors) (
	synthetic *tabula.Row,
) {
	// choose one of the K nearest neighbors
	randIdx := rand.Intn(neighbors.Len())
	n := neighbors.Row(randIdx)

	// Check if synthetic sample can be created from p and n.
	canit, slp, sln := in.canCreate(p, n)
	if !canit {
		if DEBUG >= 2 {
			fmt.Println("[lnsmote] can not create synthetic")
		}

		if slp.Len() <= 0 {
			in.outliers.PushBack(p)
		}

		// we can not create from p and synthetic.
		return nil
	}

	synthetic = p.Clone()

	for x, srec := range *synthetic {
		// Skip class attribute.
		if x == in.ClassIndex {
			continue
		}

		delta := in.randomGap(p, n, slp.Len(), sln.Len())
		pv := (*p)[x].Float()
		diff := (*n)[x].Float() - pv
		srec.SetFloat(pv + delta*diff)
	}

	return
}