You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: top.rb
    path of file: ./repos/vernier/lib/vernier/output
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Vernier
  module Output
    class Top
      def initialize(profile)
        @profile = profile
      end

      def output
        stack_weights = Hash.new(0)
        @profile.samples.zip(@profile.weights) do |stack_idx, weight|
          stack_weights[stack_idx] += weight
        end

        top_by_self = Hash.new(0)
        stack_weig
    
      def output
        stack_weights = Hash.new(0)
        @profile.samples.zip(@profile.weights) do |stack_idx, weight|
          stack_weights[stack_idx] += weight
        end

        top_by_self = Hash.new(0)
        stack_weights.each do |stack_idx, weight|
          stack = @profile.stack(stack_idx)
          top_by_self[stack.leaf_frame.name] += weight
        end

        s = +""
        top_by_self.sort_by(&:last).reverse.each do |frame, samples|
          s << "#{samples}\t#{frame}\n"
        end
        s
      end