X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_paramodulation%2Fparamod.ml;h=32eff6826f468e9d652f4e5797916deccaba9666;hb=e7d2bbd23d9cc06232afd4c9b50d09b95abfbefa;hp=1c91ee54ecdc8141b7fe2c0a037572b565b7d3e9;hpb=6f35dd77922431b667f7eb4669ab3fbb6092c343;p=helm.git diff --git a/helm/software/components/ng_paramodulation/paramod.ml b/helm/software/components/ng_paramodulation/paramod.ml index 1c91ee54e..32eff6826 100644 --- a/helm/software/components/ng_paramodulation/paramod.ml +++ b/helm/software/components/ng_paramodulation/paramod.ml @@ -1,95 +1,110 @@ -let debug s = - prerr_endline s -;; +(* + ||M|| This file is part of HELM, an Hypertextual, Electronic + ||A|| Library of Mathematics, developed at the Computer Science + ||T|| Department, University of Bologna, Italy. + ||I|| + ||T|| HELM is free software; you can redistribute it and/or + ||A|| modify it under the terms of the GNU General Public License + \ / version 2 or (at your option) any later version. + \ / This software is distributed as is, NO WARRANTY. + V_______________________________________________________________ *) -let nparamod rdb metasenv subst context t table = - let max_nb_iter = 999999999 in - let amount_of_time = 300.0 in - let module C = struct - let metasenv = metasenv - let subst = subst - let context = context - end - in - let nb_iter = ref 0 in - let module B = NCicBlob.NCicBlob(C) in - let module Pp = Pp.Pp (B) in - let module FU = FoUnif.Founif(B) in - let module IDX = Index.Index(B) in - let module Sup = Superposition.Superposition(B) in - let module Utils = FoUtils.Utils(B) in +(* $Id: orderings.ml 9869 2009-06-11 22:52:38Z denes $ *) + +let debug s = prerr_endline s ;; +let debug _ = ();; - let module WeightOrderedPassives = +module Paramod (B : Terms.Blob) = struct + exception Failure of string * B.t Terms.bag * int * int + type bag = B.t Terms.bag * int + module Pp = Pp.Pp (B) + module FU = FoUnif.Founif(B) + module IDX = Index.Index(B) + module Sup = Superposition.Superposition(B) + module Utils = FoUtils.Utils(B) + module WeightOrderedPassives = struct type t = B.t Terms.passive_clause - let compare = Utils.compare_passive_clauses_weight end - in - let module AgeOrderedPassives = + + module AgeOrderedPassives = struct type t = B.t Terms.passive_clause - let compare = Utils.compare_passive_clauses_age end - in - let module WeightPassiveSet = Set.Make(WeightOrderedPassives) in - let module AgePassiveSet = Set.Make(AgeOrderedPassives) in - let add_passive_clause (passives_w,passives_a) cl = - let cl = Utils.mk_passive_clause cl in + + module WeightPassiveSet = Set.Make(WeightOrderedPassives) + module AgePassiveSet = Set.Make(AgeOrderedPassives) + + let add_passive_clause ?(no_weight=false) (passives_w,passives_a) cl = + let cl = if no_weight then (0,cl) + else Utils.mk_passive_clause cl in WeightPassiveSet.add cl passives_w, AgePassiveSet.add cl passives_a - in + ;; + let remove_passive_clause (passives_w,passives_a) cl = let passives_w = WeightPassiveSet.remove cl passives_w in let passives_a = AgePassiveSet.remove cl passives_a in passives_w,passives_a - in - let add_passive_clauses (passives_w,passives_a) new_clauses = - let new_clauses_w,new_clauses_a = List.fold_left add_passive_clause + ;; + + let add_passive_clauses ?(no_weight=false) + (passives_w,passives_a) new_clauses = + let new_clauses_w,new_clauses_a = + List.fold_left (add_passive_clause ~no_weight) (WeightPassiveSet.empty,AgePassiveSet.empty) new_clauses in (WeightPassiveSet.union new_clauses_w passives_w, AgePassiveSet.union new_clauses_a passives_a) - in + ;; + let is_passive_set_empty (passives_w,passives_a) = if (WeightPassiveSet.is_empty passives_w) then begin assert (AgePassiveSet.is_empty passives_a); true end else begin assert (not (AgePassiveSet.is_empty passives_a)); false end - in - let passive_set_cardinal (passives_w,_) = - WeightPassiveSet.cardinal passives_w - in - let passive_singleton cl = - (WeightPassiveSet.singleton cl,AgePassiveSet.singleton cl) - in + ;; + + let passive_set_cardinal (passives_w,_) = WeightPassiveSet.cardinal passives_w + let passive_empty_set = (WeightPassiveSet.empty,AgePassiveSet.empty) - in - let pick_min_passive use_age (passives_w,passives_a) = + ;; + + let pick_min_passive ~use_age (passives_w,passives_a) = if use_age then AgePassiveSet.min_elt passives_a else WeightPassiveSet.min_elt passives_w - in - let timeout = Unix.gettimeofday () +. amount_of_time in + ;; + + let mk_clause bag maxvar (t,ty) = + let (proof,ty) = B.saturate t ty in + let c, maxvar = Utils.mk_unit_clause maxvar ty proof in + let bag, c = Utils.add_to_bag bag c in + (bag, maxvar), c + ;; + + let mk_passive (bag,maxvar) = mk_clause bag maxvar;; + let mk_goal (bag,maxvar) = mk_clause bag maxvar;; - (* TODO : global age over facts and goals (without comparing weights) *) - let select passives g_passives = + (* TODO : global age over facts and goals (without comparing weights) *) + let select ~use_age passives g_passives = if is_passive_set_empty passives then begin assert (not (is_passive_set_empty g_passives)); - let g_cl = pick_min_passive false g_passives in + let g_cl = pick_min_passive ~use_age:use_age g_passives in (true,snd g_cl,passives,remove_passive_clause g_passives g_cl) end - else let cl = pick_min_passive false passives in + else let cl = pick_min_passive ~use_age:use_age passives in if is_passive_set_empty g_passives then (false,snd cl,remove_passive_clause passives cl,g_passives) else - let g_cl = pick_min_passive false g_passives in + let g_cl = pick_min_passive ~use_age:use_age g_passives in if (fst cl <= fst g_cl) then (false,snd cl,remove_passive_clause passives cl,g_passives) else (true,snd g_cl,passives,remove_passive_clause g_passives g_cl) - in + ;; let backward_infer_step bag maxvar actives passives g_actives g_passives g_current = @@ -101,7 +116,7 @@ let nparamod rdb metasenv subst context t table = debug "Performed infer_left step"; bag, maxvar, actives, passives, g_current::g_actives, (add_passive_clauses g_passives new_goals) - in + ;; let forward_infer_step bag maxvar actives passives g_actives g_passives current = @@ -116,9 +131,6 @@ let nparamod rdb metasenv subst context t table = * new'= demod A'' new * * P' = P + new' *) debug "Forward infer step..."; - debug "Selected and simplified"; - (* debug ("Fact after simplification :" - ^ Pp.pp_unit_clause current); *) let bag, maxvar, actives, new_clauses = Sup.infer_right bag maxvar current actives in @@ -127,7 +139,9 @@ let nparamod rdb metasenv subst context t table = let bag, g_actives = List.fold_left (fun (bag,acc) c -> - match Sup.simplify_goal maxvar (snd actives) bag acc c with + match + Sup.simplify_goal ~no_demod:false maxvar (snd actives) bag acc c + with | None -> bag, acc | Some (bag,c) -> bag,c::acc) (bag,[]) g_actives @@ -144,39 +158,96 @@ let nparamod rdb metasenv subst context t table = bag, maxvar, actives, add_passive_clauses passives new_clauses, g_actives, add_passive_clauses g_passives new_goals - in - - let rec given_clause bag maxvar actives passives g_actives g_passives = - (* prerr_endline "Bag :"; prerr_endline (Pp.pp_bag bag); - prerr_endline "Active table :"; - (List.iter (fun x -> prerr_endline (Pp.pp_unit_clause x)) - (fst actives)); *) - incr nb_iter; if !nb_iter = max_nb_iter then - raise (Failure "No iterations left !"); - if Unix.gettimeofday () > timeout then - raise (Failure "Timeout !"); + ;; + + let rec given_clause ~noinfer + bag maxvar iterno max_steps timeout + actives passives g_actives g_passives + = + let iterno = iterno + 1 in + if iterno = max_steps then + raise (Failure ("No iterations left !",bag,maxvar,iterno)); + (* timeout check: gettimeofday called only if timeout set *) + if timeout <> None && + (match timeout with + | None -> assert false + | Some timeout -> Unix.gettimeofday () > timeout) then + begin + prerr_endline("Last chance: "^string_of_float (Unix.gettimeofday())); + given_clause ~noinfer:true bag maxvar iterno max_steps None + actives passives g_actives g_passives + (*raise (Failure ("Timeout !",bag,maxvar,iterno))*) + end + else + let use_age = iterno mod 10 = 0 in - let rec aux_select passives g_passives = - let backward,current,passives,g_passives = select passives g_passives in + let rec aux_select bag passives g_passives = + if noinfer && + is_passive_set_empty passives && + is_passive_set_empty g_passives then + begin + prerr_endline + ("Last chance: all is indexed " ^ string_of_float + (Unix.gettimeofday())); + let maxgoals = 100 in + List.fold_left + (fun (acc,i) x -> + if i < maxgoals then + ignore(Sup.simplify_goal ~no_demod:true + maxvar (snd actives) bag acc x) + else + (); + x::acc,i+1) + ([],0) g_actives; + raise (Failure (("Last chance: failed over " ^ + string_of_int maxgoals^ " goal " ^ + string_of_float (Unix.gettimeofday())),bag,maxvar,0)); + end; + let backward,current,passives,g_passives = + select ~use_age:false passives g_passives + in if backward then - match Sup.simplify_goal maxvar (snd actives) bag g_actives current with - | None -> aux_select passives g_passives - | Some x -> let bag,g_current = x in - backward_infer_step bag maxvar actives passives - g_actives g_passives g_current + match + if noinfer then Some (bag,current) + else + Sup.simplify_goal + ~no_demod:false maxvar (snd actives) bag g_actives current + with + | None -> aux_select bag passives g_passives + | Some (bag,g_current) -> + if noinfer then + let g_actives = g_current :: g_actives in + bag,maxvar,actives,passives,g_actives,g_passives + else + backward_infer_step bag maxvar actives passives + g_actives g_passives g_current else (* debug ("Selected fact : " ^ Pp.pp_unit_clause current); *) - match Sup.keep_simplified current actives bag maxvar with + match + if noinfer then bag, Some (current,actives) + else Sup.keep_simplified current actives bag maxvar with (* match Sup.one_pass_simplification current actives bag maxvar with*) - | None -> aux_select passives g_passives - | Some x -> let (current, bag, actives) = x in - forward_infer_step bag maxvar actives passives - g_actives g_passives current + | bag,None -> aux_select bag passives g_passives + | bag,Some (current,actives) -> + if noinfer then + let actives = + current::fst actives, + IDX.index_unit_clause (snd actives) current + in + bag,maxvar,actives,passives,g_actives,g_passives + else + forward_infer_step bag maxvar actives passives + g_actives g_passives current in + + (* prerr_endline "Bag :"; prerr_endline (Pp.pp_bag bag); + prerr_endline "Active table :"; + (List.iter (fun x -> prerr_endline (Pp.pp_unit_clause x)) + (fst actives)); *) let bag,maxvar,actives,passives,g_actives,g_passives = - aux_select passives g_passives + aux_select bag passives g_passives in debug (Printf.sprintf "Number of active goals : %d" @@ -189,76 +260,56 @@ let nparamod rdb metasenv subst context t table = debug (Printf.sprintf "Number of passives : %d" (passive_set_cardinal passives)); - given_clause bag maxvar actives passives g_actives g_passives - in + given_clause ~noinfer + bag maxvar iterno max_steps timeout + actives passives g_actives g_passives + ;; - let mk_clause bag maxvar (t,ty) = - let (proof,ty) = B.saturate t ty in - let c, maxvar = Utils.mk_unit_clause maxvar ty proof in - let bag, c = Utils.add_to_bag bag c in - bag, maxvar, c - in - let bag, maxvar, goal = mk_clause Terms.M.empty 0 t in - let g_actives = [] in - let g_passives = - passive_singleton (Utils.mk_passive_clause goal) - in - let passives, bag, maxvar = - List.fold_left - (fun (cl, bag, maxvar) t -> - let bag, maxvar, c = mk_clause bag maxvar t in - (add_passive_clause cl c), bag, maxvar) - (passive_empty_set, bag, maxvar) table - in - let actives = [], IDX.DT.empty in - try given_clause bag maxvar actives passives g_actives g_passives - with - | Sup.Success (bag, _, (i,_,_,_)) -> - let l = - let rec traverse ongoal (accg,acce) i = - match Terms.M.find i bag with - | (id,_,_,Terms.Exact _) -> - if ongoal then [i],acce else - if (List.mem i acce) then accg,acce else accg,acce@[i] - | (_,_,_,Terms.Step (_,i1,i2,_,_,_)) -> - if (not ongoal) && (List.mem i acce) then accg,acce - else - let accg,acce = - traverse false (traverse ongoal (accg,acce) i1) i2 - in - if ongoal then i::accg,acce else accg,i::acce - in - let gsteps,esteps = traverse true ([],[]) i in - (List.rev esteps)@gsteps - in - prerr_endline (Printf.sprintf "Found proof in %d iterations, %fs" - !nb_iter - (Unix.gettimeofday() -. timeout +. amount_of_time)); - (* prerr_endline "Proof:"; - List.iter (fun x -> prerr_endline (string_of_int x); - prerr_endline (Pp.pp_unit_clause (Terms.M.find x bag))) l;*) - let proofterm = B.mk_proof bag i l in - prerr_endline (Printf.sprintf "Got proof term, %fs" - (Unix.gettimeofday() -. timeout +. amount_of_time)); - let metasenv, proofterm = - let rec aux k metasenv = function - | NCic.Meta _ as t -> metasenv, t - | NCic.Implicit _ -> - let metasenv,i,_,_=NCicMetaSubst.mk_meta metasenv context `Term in - metasenv, NCic.Meta (i,(k,NCic.Irl (List.length context))) - | t -> NCicUntrusted.map_term_fold_a - (fun _ k -> k+1) k aux metasenv t + let paramod ~max_steps ?timeout (bag,maxvar) ~g_passives ~passives = + let initial_timestamp = Unix.gettimeofday () in + let passives = + add_passive_clauses ~no_weight:true passive_empty_set passives + in + let g_passives = + add_passive_clauses ~no_weight:true passive_empty_set g_passives + in + let g_actives = [] in + let actives = [], IDX.DT.empty in + try + given_clause ~noinfer:false + bag maxvar 0 max_steps timeout actives passives g_actives g_passives + with + | Sup.Success (bag, _, (i,_,_,_)) -> + let l = + let rec traverse ongoal (accg,acce) i = + match Terms.M.find i bag with + | (id,_,_,Terms.Exact _),_ -> + if ongoal then [i],acce else + if (List.mem i acce) then accg,acce else accg,acce@[i] + | (_,_,_,Terms.Step (_,i1,i2,_,_,_)),_ -> + if (not ongoal) && (List.mem i acce) then accg,acce + else + let accg,acce = + traverse false (traverse ongoal (accg,acce) i1) i2 + in + if ongoal then i::accg,acce else accg,i::acce + in + let gsteps,esteps = traverse true ([],[]) i in + (List.rev esteps)@gsteps in - aux 0 metasenv proofterm - in - let metasenv, subst, proofterm, _prooftype = - NCicRefiner.typeof - (rdb#set_coerc_db NCicCoercion.empty_db) - metasenv subst context proofterm None - in - proofterm, metasenv, subst - | Failure s -> - prerr_endline s; - prerr_endline - (Printf.sprintf "FAILURE in %d iterations" !nb_iter); assert false -;; + prerr_endline + (Printf.sprintf "Found proof, %fs" + (Unix.gettimeofday() -. initial_timestamp)); + (* + prerr_endline "Proof:"; + List.iter (fun x -> + prerr_endline (Pp.pp_unit_clause (fst(Terms.M.find x bag)))) l; + *) + [ bag, i, l ] + | Failure (msg,_bag,_maxvar,iterno) -> + prerr_endline msg; + prerr_endline (Printf.sprintf "FAILURE in %d iterations" iterno); + [] + ;; + +end