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: lsi.rb
    path of file: ./repos/classifier-reborn/lib/classifier-reborn
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

# Author::    David Fayram  (mailto:dfayram@lensmen.net)
# Copyright:: Copyright (c) 2005 David Fayram II
# License::   LGPL

# Try to load Numo first - it's the most current and the most well-supported.
# Fall back to GSL.
# Fall back to native vector.
begin
  raise LoadError if ENV['NATIVE_VECTOR'] == 'true' # to test the native vector class, try `rake test NATIVE_VECTOR=true`
  raise LoadErr
    
    def add_item(item, *categories, &block)
      clean_word_hash = Hasher.word_hash((block ? yield(item) : item.to_s),
                                         token_filters: @token_filters)
      if clean_word_hash.empty?
        puts "Input: '#{item}' is entirely stopwords or words with 2 or fewer characters. Classifier-Reborn cannot handle this document properly."
      else
        @items[item] = if @cache_node_vectors
                         CachedContentNode.new(clean_word_hash, *categories)
                       else
                         ContentNode.new(clean_word_hash, *categories)
                       end
        @version += 1
        build_index if @auto_rebuild
      end