Structure mlFeature

signature mlFeature =
sig

  include Abbrev

  type fea = int list
  type symfreq = (int, int) Redblackmap.dict
  type symweight = (int, real) Redblackmap.dict

  val fea_compare : fea * fea -> order

  (* set flag to false for constant features and to true for subterms features *)
  val sfea_of_term : bool -> term -> string list
  val sfea_of_goal : bool -> goal -> string list

  val fea_of_term : bool -> term -> fea
  val fea_of_term_mod : int -> bool -> term -> fea
  val fea_of_goal : bool -> goal -> fea

  val clean_goalsubfea_cache : unit -> unit
  val clean_goalcfea_cache : unit -> unit
  val fea_of_goal_cached : bool -> goal -> fea

  (* tfidf *)
  val learn_tfidf : ('a * fea) list -> symweight
  val learn_tfidf_symfreq :int -> int list -> symfreq -> symweight
  val learn_tfidf_symfreq_nofilter : int -> symfreq -> symweight


end

HOL 4, Kananaskis-14