func (p *Profile) RemoveNumLabel(key string) {
	for _, sample := range p.Sample {
		delete(sample.NumLabel, key)
		delete(sample.NumUnit, key)
	}
}

// DiffBaseSample returns true if a sample belongs to the diff base and false
// otherwise.
func (s *Sample) DiffBaseSample() bool {
	return s.HasLabel("pprof::base", "true")
}

// Scale multiplies all sample values in a profile by a constant and keeps

		var d, v int64
		v = value(sample.Value)
		if meanDiv != nil {
			d = meanDiv(sample.Value)
		}
		if v < 0 {
			v = -v
		}
		total += v
		div += d
		if sample.DiffBaseSample() {
			diffTotal += v
			diffDiv += d
		}
	}
	if diffTotal > 0 {
		total = diffTotal
		div = diffDiv
	}
	if div != 0 {
		return total / div
	}
	return total
}