code: func (a *AlgorithmDefault) WeightingRelation(
  	word1ID int,
  	word2ID int,
  	rank *Rank,
  ) float32 {
  	relationQty := rank.Relation.Node[word1ID][word2ID].Qty
  
  	return float32(relationQty)
  }
docs: // WeightingRelation method is the traditional algorithm of text rank to
  // weighting a phrase.