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decode_test.ml
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decode_test.ml
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(***********************************************************************)
(* decode_test.ml - Unit tests for number.ml *)
(* *)
(* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, *)
(* 2011, 2012 Yaron Minsky and Contributors *)
(* *)
(* This file is part of SKS. SKS is free software; you can *)
(* redistribute it and/or modify it under the terms of the GNU General *)
(* Public License as published by the Free Software Foundation; either *)
(* version 2 of the License, or (at your option) any later version. *)
(* *)
(* This program is distributed in the hope that it will be useful, but *)
(* WITHOUT ANY WARRANTY; without even the implied warranty of *)
(* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *)
(* General Public License for more details. *)
(* *)
(* You should have received a copy of the GNU General Public License *)
(* along with this program; if not, write to the Free Software *)
(* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *)
(* USA or see <http://www.gnu.org/licenses/>. *)
(***********************************************************************)
open StdLabels
open MoreLabels
open Printf
open Decode
open Common
open ZZp.Infix
module ZSet = ZZp.Set
let rand_int = Random.State.int RMisc.det_rng
let rand_bits () = Random.State.bits RMisc.det_rng
(*************************************************************************)
(** Simple counter table *)
let ctr_table = Hashtbl.create 0
let incr_count name =
try
let ctr_ref = Hashtbl.find ctr_table name in
incr ctr_ref
with
Not_found ->
Hashtbl.add ctr_table ~key:name ~data:(ref 1)
let read_count name =
try !(Hashtbl.find ctr_table name)
with Not_found -> 0
(*************************************************************************)
let test name cond =
printf ".%!";
incr_count name;
if not cond then raise
(Unit_test_failure (sprintf "Decode test <%s:%d> failed"
name (read_count name)))
(** creates a random monic polynomial of desired dimension *)
let rand_poly dim =
let poly = Array.init (dim + 1)
~f:(fun i ->
if i = dim then ZZp.one
else ZZp.rand rand_bits)
in
Poly.of_array poly
let interp_test () =
let deg = rand_int 10 + 1 in
let num_deg = rand_int deg in
let denom_deg = deg - num_deg in
let num = rand_poly num_deg in
let denom = rand_poly denom_deg in
test "poly construction"
(Poly.degree num == num_deg && Poly.degree denom = denom_deg );
let mbar = rand_int 9 + 1 in
let n = mbar + 1 in
let toobig = deg + 1 > mbar in
let values = ZZp.mut_array_to_array (ZZp.svalues n) in
let points = ZZp.points n in
for i = 0 to Array.length values - 1 do
values.(i) <- Poly.eval num points.(i) /: Poly.eval denom points.(i)
done;
try
let (found_num,found_denom) =
Decode.interpolate ~values ~points ~d:(num_deg - denom_deg)
in
(* printf "mbar: %d, num_deg: %d, denom_deg: %d\n" mbar num_deg denom_deg;
printf "num: %s\ndenom: %s\n%!" (Poly.to_string num) (Poly.to_string denom);
printf "gcd: %s\n" (Poly.to_string (Poly.gcd num denom));
printf "found num: %s\nfound denom: %s\n%!"
(Poly.to_string found_num) (Poly.to_string found_denom); *)
test "degree equality" (toobig
|| (Poly.degree found_num = Poly.degree num
&& Poly.degree found_denom = Poly.degree denom));
test "num equality" (toobig || Poly.eq found_num num);
test "denom equality" (toobig || Poly.eq found_denom denom);
with
Interpolation_failure ->
test (sprintf "interpolation failed (deg:%d,mbar:%d)" deg mbar)
(deg + 1 > mbar)
let set_init ~f n =
let rec loop n set =
if n = 0 then set
else loop (n - 1) (ZSet.add (f ()) set)
in
loop n ZSet.empty
let ( &> ) f g x = f (g x)
let ( &< ) g f x = f (g x)
let ( @@ ) f x = f x
(** Test full reconciliation, from beginning to end *)
let reconcile_test () =
let mbar = rand_int 20 + 1 in (* maximum recoverable # of points *)
let n = mbar + 1 in (* Number of sample values to capture *)
let points = ZZp.points n in (* Array of evaluation points *)
let svalues1 = ZZp.svalues n in (* sample values 1 *)
let svalues2 = ZZp.svalues n in (* sample values 2 *)
let m = rand_int (mbar * 2) + 1 in (* diff size to be reconciled *)
(* m1 and m2 are a partitioning of m *)
let m1 = rand_int m in
let m2 = m - m1 in
let set1 = set_init m1 ~f:(fun () -> ZZp.rand rand_bits) in
let set2 = set_init m2 ~f:(fun () -> ZZp.rand rand_bits) in
(* printf "mbar: %d, m: %d, m1: %d, m2: %d\n%!" mbar m m1 m2; *)
test "full sets" (ZSet.cardinal set1 = m1 && ZSet.cardinal set2 = m2);
test "empty intersection" (ZSet.is_empty @@ ZSet.inter set1 set2);
ZSet.iter ~f:(fun x -> ZZp.add_el ~svalues:svalues1 ~points x) set1;
ZSet.iter ~f:(fun x -> ZZp.add_el ~svalues:svalues2 ~points x) set2;
let values = ZZp.mut_array_div svalues1 svalues2 in
try
let (diff1,diff2) =
Decode.reconcile ~values ~points ~d:(m1 - m2)
in
test "size equality set1"
(ZSet.cardinal set1 = ZSet.cardinal diff1);
test "size equality set2"
(ZSet.cardinal set2 = ZSet.cardinal diff2);
test "recon compare" (ZSet.equal diff1 set1 && ZSet.equal diff2 set2)
with
Low_mbar -> test "low mbar" (m > mbar)
let factorization_test () =
let deg = rand_int 10 + 1 in
let terms = Array.to_list (Array.init deg (fun _ -> rand_poly 1)) in
let poly = List.fold_left ~init:Poly.one ~f:Poly.mult terms in
let roots = Decode.factor poly in
let orig_roots =
ZZp.zset_of_list (List.map ~f:(fun p -> ZZp.neg (Poly.to_array p).(0)) terms)
in
test "factor equality" (ZSet.equal orig_roots roots)
let interp_run () =
let deg = rand_int 10 + 1 in
let num_deg = rand_int deg in
let denom_deg = deg - num_deg in
let num = rand_poly num_deg in
let denom = rand_poly denom_deg in
if not (Poly.degree num == num_deg && Poly.degree denom = denom_deg )
then `poly_gen_falure (deg,num_deg,denom_deg,num,denom)
else
let mbar = rand_int 9 + 1 in
let n = mbar + 1 in
let values = ZZp.mut_array_to_array (ZZp.svalues n) in
let points = ZZp.points n in
for i = 0 to Array.length values - 1 do
values.(i) <- Poly.eval num points.(i) /: Poly.eval denom points.(i)
done;
try
let (found_num,found_denom) =
Decode.interpolate ~values ~points ~d:(num_deg - denom_deg)
in
`succ ((num,denom),(found_num,found_denom),mbar)
with
Interpolation_failure ->
`fail ((num,denom),mbar)
let run () =
begin
for i = 1 to 100 do factorization_test () done;
for i = 1 to 100 do interp_test () done;
for i = 1 to 100 do reconcile_test () done;
end