Label map[string][]string
	// NumLabel is a per-label-key map to values for numeric labels. See a note
	// above on handling multiple values for a label.
	NumLabel map[string][]int64
	// NumUnit is a per-label-key map to the unit names of corresponding numeric
	// label values. The unit info may be missing even if the label is in
	// NumLabel, see the docs in profile.proto for details. When the value is

	// to making graph.
	// TODO: modify to select first numeric tag if no bytes tag
	for _, s := range prof.Sample {
		numLabels := make(map[string][]int64, len(s.NumLabel))
		numUnits := make(map[string][]string, len(s.NumLabel))
		for k, vs := range s.NumLabel {
			if k == "bytes" {
				unit := o.NumLabelUnits[k]
				numValues := make([]int64, len(vs))
				numUnit := make([]string, len(vs))
				for i, v := range vs {

				if n == nil {
					continue
				}
				n.addSample(dw, w, labels, sample.NumLabel, sample.NumUnit, o.FormatTag, false)
				if parent != nil {
					parent.AddToEdgeDiv(n, dw, w, false, lidx != len(lines)-1)
				}
				parent = n
			}
		}
		if parent != nil {
			parent.addSample(dw, w, labels, sample.NumLabel, sample.NumUnit, o.FormatTag, true)
		}
	}

	nodes := make(Nodes, 0, len(prof.Location))