text: WITH word_counts as (
    select
      docid,
      word,
  	count(1) as cnt
    from 
      tokenized
    group by
      docid, word
  )
  -- DIGDAG_INSERT_LINE
  select 
    docid,
    collect_list(feature(translate(word,':','\;'),cnt)) as features
  from 
    word_counts
  where
    cnt >= 2
  group by 
    docid
  CLUSTER by rand(43) -- random shuffling
  ;