X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_paramodulation%2Fsuperposition.ml;h=585fbe2371caf146bb2377e072cc75b37039addb;hb=e588f626df2898792cc9c0372f6d67602ca720fc;hp=538305815261256e03d076b28742e12949963cb5;hpb=94c7a260ca00f045a3ec1b371f19de757f83003b;p=helm.git diff --git a/helm/software/components/ng_paramodulation/superposition.ml b/helm/software/components/ng_paramodulation/superposition.ml index 538305815..585fbe237 100644 --- a/helm/software/components/ng_paramodulation/superposition.ml +++ b/helm/software/components/ng_paramodulation/superposition.ml @@ -22,7 +22,7 @@ module Superposition (B : Orderings.Blob) = exception Success of B.t Terms.bag * int * B.t Terms.unit_clause - (* let debug s = prerr_endline s;; *) + (* let debug s = prerr_endline (Lazy.force s);; *) let debug _ = ();; let enable = true;; @@ -206,13 +206,15 @@ module Superposition (B : Orderings.Blob) = prof_demod.HExtlib.profile (demod table varlist) x ;; - let mydemod table varlist subterm = + let mydemod table varlist subterm = let cands = prof_demod_r.HExtlib.profile (IDX.DT.retrieve_generalizations table) subterm in list_first - (fun (dir, (id,lit,vl,_)) -> + (fun (dir, ((id,lit,vl,_) as c)) -> + debug (lazy("candidate: " + ^ Pp.pp_unit_clause c)); match lit with | Terms.Predicate _ -> assert false | Terms.Equation (l,r,_,o) -> @@ -262,6 +264,7 @@ module Superposition (B : Orderings.Blob) = ;; let rec demodulate bag (id, literal, vl, pr) table = + debug (lazy "demodulate..."); match literal with | Terms.Predicate t -> assert false | Terms.Equation (l,r,ty,_) -> @@ -274,7 +277,7 @@ module Superposition (B : Orderings.Blob) = visit bag [3] (fun x -> Terms.Node [ Terms.Leaf B.eqP; ty; l; x ]) id1 r (ctx_demod table vl) - in + in let cl,_,_ = Terms.get_from_bag id2 bag in bag,cl ;; @@ -339,7 +342,6 @@ module Superposition (B : Orderings.Blob) = in bag, maxvar, res ;; - let rewrite_eq ~unify l r ty vl table = let retrieve = if unify then IDX.DT.retrieve_unifiables @@ -463,7 +465,7 @@ module Superposition (B : Orderings.Blob) = let (id,_,_,_) = cl in let actives = List.map (fun (i,_,_,_) -> i) actives in let (res,_) = orphan_murder bag actives id in - if res then debug "Orphan murdered"; res + if res then debug (lazy "Orphan murdered"); res ;; let prof_orphan_murder = HExtlib.profile ~enable "orphan_murder";; let orphan_murder bag actives x = @@ -471,7 +473,8 @@ module Superposition (B : Orderings.Blob) = ;; (* demodulate and check for subsumption *) - let simplify table maxvar bag clause = + let simplify table maxvar bag clause = + debug (lazy "simplify..."); if is_identity_clause ~unify:false clause then bag,None (* else if orphan_murder bag actives clause then bag,None *) else let bag, clause = demodulate bag clause table in @@ -503,7 +506,7 @@ module Superposition (B : Orderings.Blob) = match simplify atable maxvar bag new_clause with | bag,None -> bag,None (* new_clause has been discarded *) | bag,(Some clause) -> - let ctable = IDX.index_unit_clause maxvar IDX.DT.empty clause in + let ctable = IDX.index_unit_clause IDX.DT.empty clause in let bag, alist, atable = List.fold_left (fun (bag, alist, atable) c -> @@ -511,7 +514,7 @@ module Superposition (B : Orderings.Blob) = |bag,None -> (bag,alist,atable) (* an active clause as been discarded *) |bag,Some c1 -> - bag, c :: alist, IDX.index_unit_clause maxvar atable c) + bag, c :: alist, IDX.index_unit_clause atable c) (bag,[],IDX.DT.empty) alist in bag, Some (clause, (alist,atable)) @@ -524,7 +527,7 @@ module Superposition (B : Orderings.Blob) = let simplification_step ~new_cl cl (alist,atable) bag maxvar new_clause = let atable1 = if new_cl then atable else - IDX.index_unit_clause maxvar atable cl + IDX.index_unit_clause atable cl in (* Simplification of new_clause with : * * - actives and cl if new_clause is not cl * @@ -535,7 +538,7 @@ module Superposition (B : Orderings.Blob) = | bag,Some clause -> (* Simplification of each active clause with clause * * which is the simplified form of new_clause *) - let ctable = IDX.index_unit_clause maxvar IDX.DT.empty clause in + let ctable = IDX.index_unit_clause IDX.DT.empty clause in let bag, newa, alist, atable = List.fold_left (fun (bag, newa, alist, atable) c -> @@ -545,7 +548,7 @@ module Superposition (B : Orderings.Blob) = |bag,Some c1 -> if (c1 == c) then bag, newa, c :: alist, - IDX.index_unit_clause maxvar atable c + IDX.index_unit_clause atable c else bag, c1 :: newa, alist, atable) (bag,[],[],IDX.DT.empty) alist @@ -587,7 +590,7 @@ module Superposition (B : Orderings.Blob) = | bag,(None, Some _) -> bag,None | bag,(Some cl1, Some (clause, (alist,atable), newa)) -> let alist,atable = - (clause::alist, IDX.index_unit_clause maxvar atable clause) + (clause::alist, IDX.index_unit_clause atable clause) in keep_simplified_aux ~new_cl:(cl!=cl1) cl1 (alist,atable) bag (newa@tl) @@ -604,12 +607,15 @@ module Superposition (B : Orderings.Blob) = let bag, clause = if no_demod then bag, clause else demodulate bag clause table in - if List.exists (are_alpha_eq clause) g_actives then None else - if (is_identity_clause ~unify:true clause) + if List.exists (are_alpha_eq clause) g_actives then None + else if (is_identity_clause ~unify:true clause) then raise (Success (bag, maxvar, clause)) else let (id,lit,vl,_) = clause in - if vl = [] then Some (bag,clause) + (* this optimization makes sense only if we demodulated, since in + that case the clause should have been turned into an identity *) + if (vl = [] && not(no_demod)) + then Some (bag,clause) else let l,r,ty = match lit with @@ -620,15 +626,15 @@ module Superposition (B : Orderings.Blob) = table (Some(bag,maxvar,clause,Subst.id_subst)) with | None -> Some (bag,clause) | Some (bag,maxvar,cl,subst) -> - prerr_endline "Goal subsumed"; + debug (lazy "Goal subsumed"); raise (Success (bag,maxvar,cl)) (* - else match is_subsumed ~unify:true bag maxvar clause table with + match is_subsumed ~unify:true bag maxvar clause table with | None -> Some (bag, clause) | Some ((bag,maxvar),c) -> prerr_endline "Goal subsumed"; raise (Success (bag,maxvar,c)) -*) +*) ;; let prof_simplify_goal = HExtlib.profile ~enable "simplify_goal";; @@ -716,14 +722,14 @@ module Superposition (B : Orderings.Blob) = (* We demodulate actives clause with current until all * * active clauses are reduced w.r.t each other *) (* let bag, (alist,atable) = keep_simplified (alist,atable) bag [current] in *) - let ctable = IDX.index_unit_clause maxvar IDX.DT.empty current in + let ctable = IDX.index_unit_clause IDX.DT.empty current in (* let bag, (alist, atable) = let bag, alist = HExtlib.filter_map_acc (simplify ctable) bag alist in bag, (alist, List.fold_left IDX.index_unit_clause IDX.DT.empty alist) in*) - debug "Simplified active clauses with fact"; + debug (lazy "Simplified active clauses with fact"); (* We superpose active clauses with current *) let bag, maxvar, new_clauses = List.fold_left @@ -734,13 +740,13 @@ module Superposition (B : Orderings.Blob) = bag, maxvar, newc @ acc) (bag, maxvar, []) alist in - debug "First superpositions"; + debug (lazy "First superpositions"); (* We add current to active clauses so that it can be * * superposed with itself *) let alist, atable = - current :: alist, IDX.index_unit_clause maxvar atable current + current :: alist, IDX.index_unit_clause atable current in - debug "Indexed"; + debug (lazy "Indexed"); let fresh_current, maxvar = Utils.fresh_unit_clause maxvar current in (* We need to put fresh_current into the bag so that all * * variables clauses refer to are known. *) @@ -749,14 +755,14 @@ module Superposition (B : Orderings.Blob) = let bag, maxvar, additional_new_clauses = superposition_with_table bag maxvar fresh_current atable in - debug "Another superposition"; + debug (lazy "Another superposition"); let new_clauses = new_clauses @ additional_new_clauses in - debug (lazy (Printf.sprintf "Demodulating %d clauses" - (List.length new_clauses))); + (* debug (lazy (Printf.sprintf "Demodulating %d clauses" + (List.length new_clauses))); *) let bag, new_clauses = HExtlib.filter_map_monad (simplify atable maxvar) bag new_clauses in - debug "Demodulated new clauses"; + debug (lazy "Demodulated new clauses"); bag, maxvar, (alist, atable), new_clauses ;; @@ -772,7 +778,7 @@ module Superposition (B : Orderings.Blob) = let bag, maxvar, new_goals = superposition_with_table bag maxvar goal atable in - debug "Superposed goal with active clauses"; + debug(lazy "Superposed goal with active clauses"); (* We simplify the new goals with active clauses *) let bag, new_goals = List.fold_left @@ -782,7 +788,7 @@ module Superposition (B : Orderings.Blob) = | Some (bag,g) -> bag,g::acc) (bag, []) new_goals in - debug "Simplified new goals with active clauses"; + debug (lazy "Simplified new goals with active clauses"); bag, maxvar, List.rev new_goals ;;