def traverse_regression_forest
      @predictions = {}
      prediction_count = trees.size
      @options.read_testing_data{|individual|
        individual_prediction = 0.0
        trees.each do |t|
          individual_prediction = (individual_prediction + Nimbus::Tree.traverse(t, individual.snp_list)).round(5)
        end
        @predictions[individual.id] = (individual_prediction / prediction_count).round(5)
      }
    end
def traverse_regression_forest
      @predictions = {}
      prediction_count = trees.size
      @options.read_testing_data{|individual|
        individual_prediction = 0.0
        trees.each do |t|
          individual_prediction = (individual_prediction + Nimbus::Tree.traverse(t, individual.snp_list)).round(5)
        end
        @predictions[individual.id] = (individual_prediction / prediction_count).round(5)
      }
    end
Traverse a testing set through every regression tree of the forest and get averaged predictions for every individual in the sample.