src/HOL/Tools/Sledgehammer/sledgehammer_fact_filter.ML
author haftmann
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(*  Title:      HOL/Tools/Sledgehammer/sledgehammer_fact_filter.ML
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    Author:     Jia Meng, Cambridge University Computer Laboratory, NICTA
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    Author:     Jasmin Blanchette, TU Muenchen
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*)
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signature SLEDGEHAMMER_FACT_FILTER =
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sig
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  type relevance_override =
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    {add: Facts.ref list,
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     del: Facts.ref list,
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     only: bool}
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  val trace : bool Unsynchronized.ref
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  val chained_prefix : string
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  val name_thms_pair_from_ref :
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    Proof.context -> thm list -> Facts.ref -> string * thm list
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  val relevant_facts :
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    bool -> real -> real -> bool -> int -> bool -> relevance_override
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    -> Proof.context * (thm list * 'a) -> thm list -> (string * thm) list
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end;
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structure Sledgehammer_Fact_Filter : SLEDGEHAMMER_FACT_FILTER =
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struct
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val trace = Unsynchronized.ref false
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fun trace_msg msg = if !trace then tracing (msg ()) else ()
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val respect_no_atp = true
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type relevance_override =
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  {add: Facts.ref list,
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   del: Facts.ref list,
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   only: bool}
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val sledgehammer_prefix = "Sledgehammer" ^ Long_Name.separator
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(* Used to label theorems chained into the goal. *)
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val chained_prefix = sledgehammer_prefix ^ "chained_"
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fun name_thms_pair_from_ref ctxt chained_ths xref =
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  let
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    val ths = ProofContext.get_fact ctxt xref
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    val name = Facts.string_of_ref xref
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               |> forall (member Thm.eq_thm chained_ths) ths
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                  ? prefix chained_prefix
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  in (name, ths) end
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(***************************************************************)
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(* Relevance Filtering                                         *)
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(***************************************************************)
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fun strip_Trueprop (@{const Trueprop} $ t) = t
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  | strip_Trueprop t = t;
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(*** constants with types ***)
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(*An abstraction of Isabelle types*)
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datatype const_typ =  CTVar | CType of string * const_typ list
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(*Is the second type an instance of the first one?*)
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fun match_type (CType(con1,args1)) (CType(con2,args2)) =
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      con1=con2 andalso match_types args1 args2
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  | match_type CTVar _ = true
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  | match_type _ CTVar = false
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and match_types [] [] = true
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  | match_types (a1::as1) (a2::as2) = match_type a1 a2 andalso match_types as1 as2;
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(*Is there a unifiable constant?*)
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fun uni_mem goal_const_tab (c, c_typ) =
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  exists (match_types c_typ) (these (Symtab.lookup goal_const_tab c))
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(*Maps a "real" type to a const_typ*)
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fun const_typ_of (Type (c,typs)) = CType (c, map const_typ_of typs)
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  | const_typ_of (TFree _) = CTVar
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  | const_typ_of (TVar _) = CTVar
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(*Pairs a constant with the list of its type instantiations (using const_typ)*)
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fun const_with_typ thy (c,typ) =
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    let val tvars = Sign.const_typargs thy (c,typ)
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    in (c, map const_typ_of tvars) end
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    handle TYPE _ => (c,[]);   (*Variable (locale constant): monomorphic*)
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(*Add a const/type pair to the table, but a [] entry means a standard connective,
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  which we ignore.*)
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fun add_const_type_to_table (c, ctyps) =
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  Symtab.map_default (c, [ctyps])
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                     (fn [] => [] | ctypss => insert (op =) ctyps ctypss)
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val fresh_prefix = "Sledgehammer.Fresh."
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val flip = Option.map not
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val boring_natural_consts = [@{const_name If}]
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(* Including equality in this list might be expected to stop rules like
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   subset_antisym from being chosen, but for some reason filtering works better
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   with them listed. The logical signs All, Ex, &, and --> are omitted for CNF
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   because any remaining occurrences must be within comprehensions. *)
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val boring_cnf_consts =
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  [@{const_name Trueprop}, @{const_name "==>"}, @{const_name all},
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   @{const_name "=="}, @{const_name "op |"}, @{const_name Not},
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   @{const_name "op ="}]
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fun get_consts_typs thy pos ts =
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  let
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    (* Free variables are included, as well as constants, to handle locales.
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       "skolem_id" is included to increase the complexity of theorems containing
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       Skolem functions. In non-CNF form, "Ex" is included but each occurrence
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       is considered fresh, to simulate the effect of Skolemization. *)
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    fun do_term t =
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      case t of
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        Const x => add_const_type_to_table (const_with_typ thy x)
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      | Free x => add_const_type_to_table (const_with_typ thy x)
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      | (t as Const (@{const_name skolem_id}, _)) $ _ => do_term t
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      | t1 $ t2 => do_term t1 #> do_term t2
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      | Abs (_, _, t) =>
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        (* Abstractions lead to combinators, so we add a penalty for them. *)
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        add_const_type_to_table (gensym fresh_prefix, [])
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        #> do_term t
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      | _ => I
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    fun do_quantifier sweet_pos pos body_t =
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      do_formula pos body_t
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      #> (if pos = SOME sweet_pos then I
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          else add_const_type_to_table (gensym fresh_prefix, []))
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    and do_equality T t1 t2 =
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      fold (if T = @{typ bool} orelse T = @{typ prop} then do_formula NONE
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            else do_term) [t1, t2]
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    and do_formula pos t =
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      case t of
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        Const (@{const_name all}, _) $ Abs (_, _, body_t) =>
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        do_quantifier false pos body_t
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      | @{const "==>"} $ t1 $ t2 =>
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        do_formula (flip pos) t1 #> do_formula pos t2
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      | Const (@{const_name "=="}, Type (_, [T, _])) $ t1 $ t2 =>
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        do_equality T t1 t2
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      | @{const Trueprop} $ t1 => do_formula pos t1
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      | @{const Not} $ t1 => do_formula (flip pos) t1
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      | Const (@{const_name All}, _) $ Abs (_, _, body_t) =>
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        do_quantifier false pos body_t
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      | Const (@{const_name Ex}, _) $ Abs (_, _, body_t) =>
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        do_quantifier true pos body_t
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      | @{const "op &"} $ t1 $ t2 => fold (do_formula pos) [t1, t2]
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      | @{const "op |"} $ t1 $ t2 => fold (do_formula pos) [t1, t2]
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      | @{const "op -->"} $ t1 $ t2 =>
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        do_formula (flip pos) t1 #> do_formula pos t2
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      | Const (@{const_name "op ="}, Type (_, [T, _])) $ t1 $ t2 =>
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        do_equality T t1 t2
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      | (t0 as Const (_, @{typ bool})) $ t1 =>
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        do_term t0 #> do_formula pos t1  (* theory constant *)
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      | _ => do_term t
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  in
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    Symtab.empty
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    |> fold (Symtab.update o rpair []) boring_natural_consts
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    |> fold (do_formula pos) ts
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  end
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(*Inserts a dummy "constant" referring to the theory name, so that relevance
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  takes the given theory into account.*)
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fun theory_const_prop_of theory_relevant th =
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  if theory_relevant then
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    let
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      val name = Context.theory_name (theory_of_thm th)
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      val t = Const (name ^ ". 1", @{typ bool})
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    in t $ prop_of th end
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  else
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    prop_of th
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(**** Constant / Type Frequencies ****)
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(*A two-dimensional symbol table counts frequencies of constants. It's keyed first by
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  constant name and second by its list of type instantiations. For the latter, we need
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  a linear ordering on type const_typ list.*)
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local
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fun cons_nr CTVar = 0
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  | cons_nr (CType _) = 1;
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in
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fun const_typ_ord TU =
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  case TU of
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    (CType (a, Ts), CType (b, Us)) =>
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      (case fast_string_ord(a,b) of EQUAL => dict_ord const_typ_ord (Ts,Us) | ord => ord)
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  | (T, U) => int_ord (cons_nr T, cons_nr U);
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end;
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structure CTtab = Table(type key = const_typ list val ord = dict_ord const_typ_ord);
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fun count_axiom_consts theory_relevant thy (_, th) =
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  let
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    fun do_const (a, T) =
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      let val (c, cts) = const_with_typ thy (a,T) in
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        (* Two-dimensional table update. Constant maps to types maps to
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           count. *)
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        CTtab.map_default (cts, 0) (Integer.add 1)
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        |> Symtab.map_default (c, CTtab.empty)
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      end
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    fun do_term (Const x) = do_const x
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      | do_term (Free x) = do_const x
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      | do_term (Const (x as (@{const_name skolem_id}, _)) $ _) = do_const x
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      | do_term (t $ u) = do_term t #> do_term u
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      | do_term (Abs (_, _, t)) = do_term t
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      | do_term _ = I
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  in th |> theory_const_prop_of theory_relevant |> do_term end
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(**** Actual Filtering Code ****)
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(*The frequency of a constant is the sum of those of all instances of its type.*)
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fun const_frequency const_tab (c, cts) =
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  CTtab.fold (fn (cts', m) => match_types cts cts' ? Integer.add m)
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             (the (Symtab.lookup const_tab c)
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              handle Option.Option => raise Fail ("Const: " ^ c)) 0
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(*A surprising number of theorems contain only a few significant constants.
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  These include all induction rules, and other general theorems. Filtering
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  theorems in clause form reveals these complexities in the form of Skolem
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  functions. If we were instead to filter theorems in their natural form,
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  some other method of measuring theorem complexity would become necessary.*)
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(* "log" seems best in practice. A constant function of one ignores the constant
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   frequencies. *)
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fun log_weight2 (x:real) = 1.0 + 2.0 / Math.ln (x + 1.0)
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(* Computes a constant's weight, as determined by its frequency. *)
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val ct_weight = log_weight2 o real oo const_frequency
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(*Relevant constants are weighted according to frequency,
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  but irrelevant constants are simply counted. Otherwise, Skolem functions,
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  which are rare, would harm a clause's chances of being picked.*)
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fun clause_weight const_tab gctyps consts_typs =
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    let val rel = filter (uni_mem gctyps) consts_typs
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        val rel_weight = fold (curry Real.+ o ct_weight const_tab) rel 0.0
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    in
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        rel_weight / (rel_weight + real (length consts_typs - length rel))
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    end;
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(*Multiplies out to a list of pairs: 'a * 'b list -> ('a * 'b) list -> ('a * 'b) list*)
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fun add_expand_pairs (x,ys) xys = List.foldl (fn (y,acc) => (x,y)::acc) xys ys;
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fun consts_typs_of_term thy t =
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  Symtab.fold add_expand_pairs (get_consts_typs thy (SOME false) [t]) []
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fun pair_consts_typs_axiom theory_relevant thy axiom =
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  (axiom, axiom |> snd |> theory_const_prop_of theory_relevant
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                |> consts_typs_of_term thy)
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exception CONST_OR_FREE of unit
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fun dest_Const_or_Free (Const x) = x
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  | dest_Const_or_Free (Free x) = x
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  | dest_Const_or_Free _ = raise CONST_OR_FREE ()
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(*Look for definitions of the form f ?x1 ... ?xn = t, but not reversed.*)
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fun defines thy thm gctypes =
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    let val tm = prop_of thm
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        fun defs lhs rhs =
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            let val (rator,args) = strip_comb lhs
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                val ct = const_with_typ thy (dest_Const_or_Free rator)
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            in
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              forall is_Var args andalso uni_mem gctypes ct andalso
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                subset (op =) (Term.add_vars rhs [], Term.add_vars lhs [])
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            end
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            handle CONST_OR_FREE () => false
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    in
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        case tm of
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          @{const Trueprop} $ (Const (@{const_name "op ="}, _) $ lhs $ rhs) =>
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            defs lhs rhs
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        | _ => false
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    end;
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type annotated_cnf_thm = (string * thm) * (string * const_typ list) list
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(*For a reverse sort, putting the largest values first.*)
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fun compare_pairs ((_, w1), (_, w2)) = Real.compare (w2, w1)
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(*Limit the number of new clauses, to prevent runaway acceptance.*)
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fun take_best max_new (newpairs : (annotated_cnf_thm * real) list) =
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  let val nnew = length newpairs
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  in
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    if nnew <= max_new then (map #1 newpairs, [])
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    else
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      let val cls = sort compare_pairs newpairs
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          val accepted = List.take (cls, max_new)
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      in
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        trace_msg (fn () => ("Number of candidates, " ^ Int.toString nnew ^
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                       ", exceeds the limit of " ^ Int.toString (max_new)));
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        trace_msg (fn () => ("Effective pass mark: " ^ Real.toString (#2 (List.last accepted))));
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        trace_msg (fn () => "Actually passed: " ^
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          space_implode ", " (map (fst o fst o fst) accepted));
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        (map #1 accepted, map #1 (List.drop (cls, max_new)))
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      end
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  end;
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fun relevant_clauses ctxt relevance_convergence defs_relevant max_new
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                     ({add, del, ...} : relevance_override) const_tab =
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  let
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    val thy = ProofContext.theory_of ctxt
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    val add_thms = maps (ProofContext.get_fact ctxt) add
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    val del_thms = maps (ProofContext.get_fact ctxt) del
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    fun iter threshold rel_const_tab =
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      let
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        fun relevant ([], _) [] = []  (* Nothing added this iteration *)
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          | relevant (newpairs, rejects) [] =
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            let
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              val (newrels, more_rejects) = take_best max_new newpairs
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              val new_consts = maps #2 newrels
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              val rel_const_tab =
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                rel_const_tab |> fold add_const_type_to_table new_consts
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              val threshold =
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                threshold + (1.0 - threshold) / relevance_convergence
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            in
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              trace_msg (fn () => "relevant this iteration: " ^
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                                  Int.toString (length newrels));
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              map #1 newrels @ iter threshold rel_const_tab
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                  (more_rejects @ rejects)
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            end
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          | relevant (newrels, rejects)
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                     ((ax as (clsthm as (name, th), consts_typs)) :: axs) =
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            let
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              val weight =
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                if member Thm.eq_thm add_thms th then 1.0
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                else if member Thm.eq_thm del_thms th then 0.0
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                else clause_weight const_tab rel_const_tab consts_typs
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            in
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              if weight >= threshold orelse
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                 (defs_relevant andalso defines thy th rel_const_tab) then
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                (trace_msg (fn () =>
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                     name ^ " passes: " ^ Real.toString weight
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                     (* ^ " consts: " ^ commas (map fst consts_typs) *));
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                 relevant ((ax, weight) :: newrels, rejects) axs)
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              else
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                relevant (newrels, ax :: rejects) axs
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            end
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        in
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          trace_msg (fn () => "relevant_clauses, current threshold: " ^
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                              Real.toString threshold);
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          relevant ([], [])
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        end
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  in iter end
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fun relevance_filter ctxt relevance_threshold relevance_convergence
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                     defs_relevant max_new theory_relevant relevance_override
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                     thy axioms goals =
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  if relevance_threshold > 1.0 then
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    []
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  else if relevance_threshold < 0.0 then
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    axioms
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  else
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    let
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      val const_tab = fold (count_axiom_consts theory_relevant thy) axioms
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                           Symtab.empty
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      val goal_const_tab = get_consts_typs thy (SOME true) goals
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      val relevance_threshold = 0.9 * relevance_threshold (* FIXME *)
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      val _ =
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        trace_msg (fn () => "Initial constants: " ^
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                            commas (goal_const_tab
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                                    |> Symtab.dest
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                                    |> filter (curry (op <>) [] o snd)
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                                    |> map fst))
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      val relevant =
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        relevant_clauses ctxt relevance_convergence defs_relevant max_new
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                         relevance_override const_tab relevance_threshold
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                         goal_const_tab
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                         (map (pair_consts_typs_axiom theory_relevant thy)
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                              axioms)
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    in
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      trace_msg (fn () => "Total relevant: " ^ Int.toString (length relevant));
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      relevant
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    end
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(***************************************************************)
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(* Retrieving and filtering lemmas                             *)
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(***************************************************************)
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(*** retrieve lemmas and filter them ***)
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(*Reject theorems with names like "List.filter.filter_list_def" or
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  "Accessible_Part.acc.defs", as these are definitions arising from packages.*)
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fun is_package_def a =
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  let val names = Long_Name.explode a
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  in
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     length names > 2 andalso
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     not (hd names = "local") andalso
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     String.isSuffix "_def" a  orelse  String.isSuffix "_defs" a
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  end;
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fun make_clause_table xs =
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  fold (Termtab.update o `(prop_of o snd)) xs Termtab.empty
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fun make_unique xs =
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  Termtab.fold (cons o snd) (make_clause_table xs) []
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(* FIXME: put other record thms here, or declare as "no_atp" *)
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val multi_base_blacklist =
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  ["defs", "select_defs", "update_defs", "induct", "inducts", "split", "splits",
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   "split_asm", "cases", "ext_cases"]
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val max_lambda_nesting = 3
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   402
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   403
fun term_has_too_many_lambdas max (t1 $ t2) =
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    exists (term_has_too_many_lambdas max) [t1, t2]
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  | term_has_too_many_lambdas max (Abs (_, _, t)) =
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    max = 0 orelse term_has_too_many_lambdas (max - 1) t
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  | term_has_too_many_lambdas _ _ = false
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   408
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fun is_formula_type T = (T = HOLogic.boolT orelse T = propT)
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(* Don't count nested lambdas at the level of formulas, since they are
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   quantifiers. *)
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   413
fun formula_has_too_many_lambdas Ts (Abs (_, T, t)) =
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    formula_has_too_many_lambdas (T :: Ts) t
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  | formula_has_too_many_lambdas Ts t =
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   416
    if is_formula_type (fastype_of1 (Ts, t)) then
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      exists (formula_has_too_many_lambdas Ts) (#2 (strip_comb t))
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   418
    else
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      term_has_too_many_lambdas max_lambda_nesting t
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   420
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(* The max apply depth of any "metis" call in "Metis_Examples" (on 31-10-2007)
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   was 11. *)
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val max_apply_depth = 15
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   424
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fun apply_depth (f $ t) = Int.max (apply_depth f, apply_depth t + 1)
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  | apply_depth (Abs (_, _, t)) = apply_depth t
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  | apply_depth _ = 0
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   428
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   429
fun is_formula_too_complex t =
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  apply_depth t > max_apply_depth orelse Meson.too_many_clauses NONE t orelse
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  formula_has_too_many_lambdas [] t
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   432
37543
2e733b0a963c a76ace919f1c wasn't quite right; second try
blanchet
parents: 37538
diff changeset
   433
val exists_sledgehammer_const =
37626
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   434
  exists_Const (fn (s, _) => String.isPrefix sledgehammer_prefix s)
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   435
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   436
fun is_strange_thm th =
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   437
  case head_of (concl_of th) of
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   438
      Const (a, _) => (a <> @{const_name Trueprop} andalso
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   439
                       a <> @{const_name "=="})
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   440
    | _ => false
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   441
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   442
val type_has_top_sort =
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   443
  exists_subtype (fn TFree (_, []) => true | TVar (_, []) => true | _ => false)
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   444
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   445
fun is_theorem_bad_for_atps thm =
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   446
  let val t = prop_of thm in
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   447
    is_formula_too_complex t orelse exists_type type_has_top_sort t orelse
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   448
    exists_sledgehammer_const t orelse is_strange_thm thm
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   449
  end
37543
2e733b0a963c a76ace919f1c wasn't quite right; second try
blanchet
parents: 37538
diff changeset
   450
37580
c2c1caff5dea got rid of "respect_no_atp" option, which even I don't use
blanchet
parents: 37578
diff changeset
   451
fun all_name_thms_pairs ctxt chained_ths =
22382
dbf09db0a40d New code to store theorem names in a concise form rather than as fully-qualified.
paulson
parents: 22217
diff changeset
   452
  let
26675
fba93ce71435 all_valid_thms: use new facts tables;
wenzelm
parents: 26662
diff changeset
   453
    val global_facts = PureThy.facts_of (ProofContext.theory_of ctxt);
26278
f0c6839df608 replaced obsolete FactIndex.T by Facts.T;
wenzelm
parents: 25761
diff changeset
   454
    val local_facts = ProofContext.facts_of ctxt;
33641
af07d9cd86ce all_valid_thms: more sophisticated check against global + local name space;
wenzelm
parents: 33316
diff changeset
   455
    val full_space =
af07d9cd86ce all_valid_thms: more sophisticated check against global + local name space;
wenzelm
parents: 33316
diff changeset
   456
      Name_Space.merge (Facts.space_of global_facts, Facts.space_of local_facts);
af07d9cd86ce all_valid_thms: more sophisticated check against global + local name space;
wenzelm
parents: 33316
diff changeset
   457
af07d9cd86ce all_valid_thms: more sophisticated check against global + local name space;
wenzelm
parents: 33316
diff changeset
   458
    fun valid_facts facts =
af07d9cd86ce all_valid_thms: more sophisticated check against global + local name space;
wenzelm
parents: 33316
diff changeset
   459
      (facts, []) |-> Facts.fold_static (fn (name, ths0) =>
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   460
        if Facts.is_concealed facts name orelse
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   461
           (respect_no_atp andalso is_package_def name) orelse
37626
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   462
           member (op =) multi_base_blacklist (Long_Name.base_name name) then
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   463
          I
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   464
        else
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   465
          let
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   466
            fun check_thms a =
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   467
              (case try (ProofContext.get_thms ctxt) a of
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   468
                NONE => false
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   469
              | SOME ths1 => Thm.eq_thms (ths0, ths1));
33641
af07d9cd86ce all_valid_thms: more sophisticated check against global + local name space;
wenzelm
parents: 33316
diff changeset
   470
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   471
            val name1 = Facts.extern facts name;
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   472
            val name2 = Name_Space.extern full_space name;
37626
1146291fe718 move blacklisting completely out of the clausifier;
blanchet
parents: 37616
diff changeset
   473
            val ths = filter_out is_theorem_bad_for_atps ths0
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   474
          in
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   475
            case find_first check_thms [name1, name2, name] of
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   476
              NONE => I
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   477
            | SOME name' =>
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   478
              cons (name' |> forall (member Thm.eq_thm chained_ths) ths
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   479
                             ? prefix chained_prefix, ths)
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   480
          end)
26675
fba93ce71435 all_valid_thms: use new facts tables;
wenzelm
parents: 26662
diff changeset
   481
  in valid_facts global_facts @ valid_facts local_facts end;
21224
f86b8463af37 Proper theorem names at last, no fakes!!
paulson
parents: 21132
diff changeset
   482
33309
5f67433e6dd8 proper header;
wenzelm
parents: 33306
diff changeset
   483
fun multi_name a th (n, pairs) =
5f67433e6dd8 proper header;
wenzelm
parents: 33306
diff changeset
   484
  (n + 1, (a ^ "(" ^ Int.toString n ^ ")", th) :: pairs);
21224
f86b8463af37 Proper theorem names at last, no fakes!!
paulson
parents: 21132
diff changeset
   485
37498
b426cbdb5a23 removed Sledgehammer's support for the DFG syntax;
blanchet
parents: 37479
diff changeset
   486
fun add_names (_, []) pairs = pairs
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   487
  | add_names (a, [th]) pairs = (a, th) :: pairs
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   488
  | add_names (a, ths) pairs = #2 (fold (multi_name a) ths (1, pairs))
21224
f86b8463af37 Proper theorem names at last, no fakes!!
paulson
parents: 21132
diff changeset
   489
21290
33b6bb5d6ab8 Improvement to classrel clauses: now outputs the minimum needed.
paulson
parents: 21243
diff changeset
   490
fun is_multi (a, ths) = length ths > 1 orelse String.isSuffix ".axioms" a;
33b6bb5d6ab8 Improvement to classrel clauses: now outputs the minimum needed.
paulson
parents: 21243
diff changeset
   491
36550
f8da913b6c3a make sure short theorem names are preferred to composite ones in Sledgehammer;
blanchet
parents: 36473
diff changeset
   492
(* The single-name theorems go after the multiple-name ones, so that single
f8da913b6c3a make sure short theorem names are preferred to composite ones in Sledgehammer;
blanchet
parents: 36473
diff changeset
   493
   names are preferred when both are available. *)
37580
c2c1caff5dea got rid of "respect_no_atp" option, which even I don't use
blanchet
parents: 37578
diff changeset
   494
fun name_thm_pairs ctxt respect_no_atp name_thms_pairs =
33309
5f67433e6dd8 proper header;
wenzelm
parents: 33306
diff changeset
   495
  let
37344
40f379944c1e totally bypass Sledgehammer's relevance filter when facts are given using the "(fact1 ... factn)" syntax;
blanchet
parents: 37171
diff changeset
   496
    val (mults, singles) = List.partition is_multi name_thms_pairs
37399
34f080a12063 proper polymorphic Skolemization of uncached facts + synchronization of caching and relevance filter
blanchet
parents: 37359
diff changeset
   497
    val ps = [] |> fold add_names singles |> fold add_names mults
36060
4d27652ffb40 reintroduce efficient set structure to collect "no_atp" theorems
blanchet
parents: 36059
diff changeset
   498
  in ps |> respect_no_atp ? filter_out (No_ATPs.member ctxt o snd) end;
21224
f86b8463af37 Proper theorem names at last, no fakes!!
paulson
parents: 21132
diff changeset
   499
37344
40f379944c1e totally bypass Sledgehammer's relevance filter when facts are given using the "(fact1 ... factn)" syntax;
blanchet
parents: 37171
diff changeset
   500
fun is_named ("", th) =
40f379944c1e totally bypass Sledgehammer's relevance filter when facts are given using the "(fact1 ... factn)" syntax;
blanchet
parents: 37171
diff changeset
   501
    (warning ("No name for theorem " ^
40f379944c1e totally bypass Sledgehammer's relevance filter when facts are given using the "(fact1 ... factn)" syntax;
blanchet
parents: 37171
diff changeset
   502
              Display.string_of_thm_without_context th); false)
40f379944c1e totally bypass Sledgehammer's relevance filter when facts are given using the "(fact1 ... factn)" syntax;
blanchet
parents: 37171
diff changeset
   503
  | is_named _ = true
40f379944c1e totally bypass Sledgehammer's relevance filter when facts are given using the "(fact1 ... factn)" syntax;
blanchet
parents: 37171
diff changeset
   504
fun checked_name_thm_pairs respect_no_atp ctxt =
37580
c2c1caff5dea got rid of "respect_no_atp" option, which even I don't use
blanchet
parents: 37578
diff changeset
   505
  name_thm_pairs ctxt respect_no_atp
37344
40f379944c1e totally bypass Sledgehammer's relevance filter when facts are given using the "(fact1 ... factn)" syntax;
blanchet
parents: 37171
diff changeset
   506
  #> tap (fn ps => trace_msg
40f379944c1e totally bypass Sledgehammer's relevance filter when facts are given using the "(fact1 ... factn)" syntax;
blanchet
parents: 37171
diff changeset
   507
                        (fn () => ("Considering " ^ Int.toString (length ps) ^
40f379944c1e totally bypass Sledgehammer's relevance filter when facts are given using the "(fact1 ... factn)" syntax;
blanchet
parents: 37171
diff changeset
   508
                                   " theorems")))
40f379944c1e totally bypass Sledgehammer's relevance filter when facts are given using the "(fact1 ... factn)" syntax;
blanchet
parents: 37171
diff changeset
   509
  #> filter is_named
19894
7c7e15b27145 the "all_theorems" option and some fixes
paulson
parents: 19768
diff changeset
   510
21290
33b6bb5d6ab8 Improvement to classrel clauses: now outputs the minimum needed.
paulson
parents: 21243
diff changeset
   511
(***************************************************************)
19194
7681c04d8bff Merged res_atp_setup.ML into res_atp.ML.
mengj
parents: 18986
diff changeset
   512
(* ATP invocation methods setup                                *)
7681c04d8bff Merged res_atp_setup.ML into res_atp.ML.
mengj
parents: 18986
diff changeset
   513
(***************************************************************)
7681c04d8bff Merged res_atp_setup.ML into res_atp.ML.
mengj
parents: 18986
diff changeset
   514
37347
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   515
(**** Predicates to detect unwanted clauses (prolific or likely to cause
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   516
      unsoundness) ****)
21470
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   517
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   518
(** Too general means, positive equality literal with a variable X as one operand,
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   519
  when X does not occur properly in the other operand. This rules out clearly
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   520
  inconsistent clauses such as V=a|V=b, though it by no means guarantees soundness. **)
21588
cd0dc678a205 simplified method setup;
wenzelm
parents: 21563
diff changeset
   521
37348
3ad1bfd2de46 renaming
blanchet
parents: 37347
diff changeset
   522
fun var_occurs_in_term ix =
3ad1bfd2de46 renaming
blanchet
parents: 37347
diff changeset
   523
  let
3ad1bfd2de46 renaming
blanchet
parents: 37347
diff changeset
   524
    fun aux (Var (jx, _)) = (ix = jx)
3ad1bfd2de46 renaming
blanchet
parents: 37347
diff changeset
   525
      | aux (t1 $ t2) = aux t1 orelse aux t2
3ad1bfd2de46 renaming
blanchet
parents: 37347
diff changeset
   526
      | aux (Abs (_, _, t)) = aux t
3ad1bfd2de46 renaming
blanchet
parents: 37347
diff changeset
   527
      | aux _ = false
3ad1bfd2de46 renaming
blanchet
parents: 37347
diff changeset
   528
  in aux end
21470
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   529
37348
3ad1bfd2de46 renaming
blanchet
parents: 37347
diff changeset
   530
fun is_record_type T = not (null (Record.dest_recTs T))
21470
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   531
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   532
(*Unwanted equalities include
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   533
  (1) those between a variable that does not properly occur in the second operand,
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   534
  (2) those between a variable and a record, since these seem to be prolific "cases" thms
21588
cd0dc678a205 simplified method setup;
wenzelm
parents: 21563
diff changeset
   535
*)
37348
3ad1bfd2de46 renaming
blanchet
parents: 37347
diff changeset
   536
fun too_general_eqterms (Var (ix,T), t) =
3ad1bfd2de46 renaming
blanchet
parents: 37347
diff changeset
   537
    not (var_occurs_in_term ix t) orelse is_record_type T
21470
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   538
  | too_general_eqterms _ = false;
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   539
35865
2f8fb5242799 more Sledgehammer refactoring
blanchet
parents: 35828
diff changeset
   540
fun too_general_equality (Const (@{const_name "op ="}, _) $ x $ y) =
21470
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   541
      too_general_eqterms (x,y) orelse too_general_eqterms(y,x)
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   542
  | too_general_equality _ = false;
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   543
29267
8615b4f54047 use exists_subterm directly;
wenzelm
parents: 28477
diff changeset
   544
fun has_typed_var tycons = exists_subterm
8615b4f54047 use exists_subterm directly;
wenzelm
parents: 28477
diff changeset
   545
  (fn Var (_, Type (a, _)) => member (op =) tycons a | _ => false);
21431
ef9080e7dbbc Outputs a minimal number of arity clauses. Tidying of blacklist, fixing the blacklisting of thm lists
paulson
parents: 21397
diff changeset
   546
37347
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   547
(* Clauses are forbidden to contain variables of these types. The typical reason
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   548
   is that they lead to unsoundness. Note that "unit" satisfies numerous
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   549
   equations like "?x = ()". The resulting clause will have no type constraint,
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   550
   yielding false proofs. Even "bool" leads to many unsound proofs, though only
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   551
   for higher-order problems. *)
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   552
val dangerous_types = [@{type_name unit}, @{type_name bool}];
22217
a5d983f7113f Tidying; more debugging information. New reference unwanted_types.
paulson
parents: 22193
diff changeset
   553
37347
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   554
(* Clauses containing variables of type "unit" or "bool" or of the form
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   555
   "?x = A | ?x = B | ?x = C" are likely to lead to unsound proofs if types are
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   556
   omitted. *)
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   557
fun is_dangerous_term _ @{prop True} = true
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   558
  | is_dangerous_term full_types t =
37505
d9af5c01dc4a added code to optionally perform fact filtering on the original (non-CNF) formulas
blanchet
parents: 37504
diff changeset
   559
    not full_types andalso
37347
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   560
    (has_typed_var dangerous_types t orelse
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   561
     forall too_general_equality (HOLogic.disjuncts (strip_Trueprop t)))
21470
7c1b59ddcd56 Consolidation of code to "blacklist" unhelpful theorems, including record
paulson
parents: 21431
diff changeset
   562
37580
c2c1caff5dea got rid of "respect_no_atp" option, which even I don't use
blanchet
parents: 37578
diff changeset
   563
fun relevant_facts full_types relevance_threshold relevance_convergence
c2c1caff5dea got rid of "respect_no_atp" option, which even I don't use
blanchet
parents: 37578
diff changeset
   564
                   defs_relevant max_new theory_relevant
37347
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   565
                   (relevance_override as {add, del, only})
635425a442e8 show more respect for user-specified facts, even if they could lead to unsound proofs + don't throw away "unsound" theorems in "full_type" mode, since they are then sound
blanchet
parents: 37345
diff changeset
   566
                   (ctxt, (chained_ths, _)) goal_cls =
37538
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   567
  let
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   568
    val thy = ProofContext.theory_of ctxt
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   569
    val add_thms = maps (ProofContext.get_fact ctxt) add
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   570
    val has_override = not (null add) orelse not (null del)
37566
9ca40dff25bd move "prepare_clauses" from "sledgehammer_fact_filter.ML" to "sledgehammer_hol_clause.ML";
blanchet
parents: 37552
diff changeset
   571
    val is_FO = forall (Meson.is_fol_term thy o prop_of) goal_cls
37538
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   572
    val axioms =
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   573
      checked_name_thm_pairs (respect_no_atp andalso not only) ctxt
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   574
          (map (name_thms_pair_from_ref ctxt chained_ths) add @
37580
c2c1caff5dea got rid of "respect_no_atp" option, which even I don't use
blanchet
parents: 37578
diff changeset
   575
           (if only then [] else all_name_thms_pairs ctxt chained_ths))
37538
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   576
      |> not has_override ? make_unique
37616
c8d2d84d6011 always perform relevance filtering on original formulas
blanchet
parents: 37580
diff changeset
   577
      |> filter (fn (_, th) =>
c8d2d84d6011 always perform relevance filtering on original formulas
blanchet
parents: 37580
diff changeset
   578
                    member Thm.eq_thm add_thms th orelse
c8d2d84d6011 always perform relevance filtering on original formulas
blanchet
parents: 37580
diff changeset
   579
                    ((* ### FIXME: keep? (not is_FO orelse is_quasi_fol_theorem thy th) andalso*)
c8d2d84d6011 always perform relevance filtering on original formulas
blanchet
parents: 37580
diff changeset
   580
                     not (is_dangerous_term full_types (prop_of th))))
37538
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   581
  in
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   582
    relevance_filter ctxt relevance_threshold relevance_convergence
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   583
                     defs_relevant max_new theory_relevant relevance_override
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   584
                     thy axioms (map prop_of goal_cls)
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   585
    |> has_override ? make_unique
37616
c8d2d84d6011 always perform relevance filtering on original formulas
blanchet
parents: 37580
diff changeset
   586
    |> sort_wrt fst
37538
97ab019d5ac8 make sure that theorems passed using "add:" to Sledgehammer are not eliminated on heuristic grounds
blanchet
parents: 37537
diff changeset
   587
  end
30536
07b4f050e4df split relevance-filter and writing of problem-files;
immler@in.tum.de
parents: 30364
diff changeset
   588
15347
14585bc8fa09 resolution package tools by Jia Meng
paulson
parents:
diff changeset
   589
end;