[Scip] no call made to the pricer

Shahin Gelareh shahin.gelareh at gmail.com
Wed Apr 16 17:27:47 CEST 2014 

Dear SCIPers

I have a problem in form of:
min cx
       Az = a
       x<= z
        Bx = b
for which I am trying to design a branch and price in SCIP.
I put  Bx = b in the subproblem.

The master problem then turn to
min cx
       Az = a
       x<= z
in the space of z primals and x written in lambdas.

The pricer is adeed and initialized
           SCIP_CALL( SCIPincludeObjPricer(scip, hrp_pricer_ptr, true) );
           /* activate pricer */
           SCIP_CALL( SCIPactivatePricer(scip, SCIPfindPricer(scip,
HRP_PRICER_NAME)) );
The constructure is called and the scip_init is called.
but then the pricer never gets called and I have the following log.

I guess I am missing something but when I compare with the examples
supplied with SCIP, I cannot detect what is missing.
I would appreciate constructive comments on this.

Cheers
Shahin




SCIP version 3.1.0 [precision: 8 byte] [memory: block] [mode: debug] [LP
solver: NONE] [GitHash: 577ee45]
Copyright (c) 2002-2014 Konrad-Zuse-Zentrum fuer Informationstechnik Berlin
(ZIB)

LP Solver <NONE>: upper objective limit cannot be set -- can lead to
unnecessary simplex iterations
LP Solver <NONE>: primal feasibility tolerance cannot be set -- tolerance
of SCIP and LP solver may differ
LP Solver <NONE>: dual feasibility tolerance cannot be set -- tolerance of
SCIP and LP solver may differ
LP Solver <NONE>: barrier convergence tolerance cannot be set -- tolerance
of SCIP and LP solver may differ
LP Solver <NONE>: fastmip setting not available -- SCIP parameter has no
effect
LP Solver <NONE>: scaling not available -- SCIP parameter has no effect
LP Solver <NONE>: presolving not available -- SCIP parameter has no effect
LP Solver <NONE>: iteration limit cannot be set -- can lead to unnecessary
simplex iterations
LP Solver <NONE>: pricing strategy cannot be set -- SCIP parameter has no
effect
LP Solver <NONE>: lpinfo setting not available -- SCIP parameter has no
effect
LP Solver <NONE>: row representation of the basis not available -- SCIP
parameter lp/rowrepswitch has no effect
LP Solver <NONE>: condition number limit for the basis not available --
SCIP parameter lp/conditionlimit has no effect
LP Solver <NONE>: number of threads settings not available -- SCIP
parameter has no effect
transformed problem has 1180 variables (1000 bin, 0 int, 0 impl, 180 cont)
and 15532 constraints
  15532 constraints of type <linear>

original problem has 82770 active (0.45161%) nonzeros and 82770 (0.45161%)
check nonzeros

presolving:
(round 1) 90 del vars, 46 del conss, 0 add conss, 0 chg bounds, 0 chg
sides, 0 chg coeffs, 2155 upgd conss, 5220 impls, 235 clqs
   (6.1s) probing: 100/1000 (10.0%) - 0 fixings, 0 aggregations, 23905
implications, 0 bound changes
   (9.7s) probing: 200/1000 (20.0%) - 0 fixings, 0 aggregations, 46992
implications, 0 bound changes
   (13.2s) probing: 300/1000 (30.0%) - 0 fixings, 0 aggregations, 67288
implications, 0 bound changes
   (16.4s) probing: 400/1000 (40.0%) - 0 fixings, 0 aggregations, 84793
implications, 0 bound changes
   (19.5s) probing: 500/1000 (50.0%) - 0 fixings, 0 aggregations, 99507
implications, 0 bound changes
   (22.5s) probing: 600/1000 (60.0%) - 0 fixings, 0 aggregations, 111430
implications, 0 bound changes
   (25.4s) probing: 700/1000 (70.0%) - 0 fixings, 0 aggregations, 120562
implications, 0 bound changes
   (27.9s) probing: 800/1000 (80.0%) - 0 fixings, 0 aggregations, 126903
implications, 0 bound changes
   (30.3s) probing: 900/1000 (90.0%) - 0 fixings, 0 aggregations, 130436
implications, 0 bound changes
   (32.3s) probing: 1000/1000 (100.0%) - 0 fixings, 0 aggregations, 131355
implications, 0 bound changes
   (32.3s) probing cycle finished: starting next cycle
   (32.3s) probing: 1/1000 (0.1%) - 0 fixings, 0 aggregations, 131355
implications, 0 bound changes
   (32.3s) probing aborted: 1000/1000 successive useless probings
(round 2) 90 del vars, 246 del conss, 20 add conss, 0 chg bounds, 0 chg
sides, 0 chg coeffs, 2155 upgd conss, 511830 impls, 235 clqs
(round 3) 90 del vars, 1866 del conss, 20 add conss, 0 chg bounds, 0 chg
sides, 0 chg coeffs, 2155 upgd conss, 511830 impls, 235 clqs

presolved problem has 78260 active (0.52461%) nonzeros and 78260 (0.52461%)
check nonzeros

presolving (4 rounds):
 90 deleted vars, 1866 deleted constraints, 20 added constraints, 0
tightened bounds, 0 added holes, 0 changed sides, 0 changed coefficients
 511830 implications, 235 cliques
presolved problem has 1090 variables (1000 bin, 0 int, 0 impl, 90 cont) and
13686 constraints
     10 constraints of type <knapsack>
    325 constraints of type <setppc>
     20 constraints of type <and>
  13331 constraints of type <linear>
Presolving Time: 32.25

(node 1) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
 time | node  | left  |LP iter|LP it/n| mem |mdpt |frac |vars |cons |cols
|rows |cuts |confs|strbr|  dualbound   | primalbound  |  gap
 32.5s|     1 |     2 |     0 |     - |  38M|   0 |   - |1090 |  13k|1090
|  13k|   0 |   0 |   0 |      --      |      --      |    Inf
(node 2) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 3) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 4) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 5) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 6) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 7) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 8) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 9) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 11) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 13) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 14) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 15) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 16) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 17) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 18) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 19) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 20) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 21) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 23) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 24) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 25) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 26) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 27) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 28) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 29) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 31) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 33) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 35) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 36) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 37) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 38) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 39) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 40) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 41) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 42) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 43) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 45) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 46) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 47) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 48) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 49) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 50) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 51) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 52) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 53) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 54) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 55) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 56) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 57) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 58) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 59) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 60) unresolved numerical troubles in LP 0 -- using pseudo solution
instead (loop 1)
(node 60) forcing the solution of an LP (last LP 0)...
[..\..\scipoptsuite\scip\src\scip\solve.c:3415] ERROR: (node 60) unresolved
numerical troubles in LP 0 cannot be dealt with
[..\..\scipoptsuite\scip\src\scip\solve.c:3681] ERROR: Error <-6> in
function call
[..\..\scipoptsuite\scip\src\scip\solve.c:4312] ERROR: Error <-6> in
function call
[..\..\scipoptsuite\scip\src\scip\scip.c:13633] ERROR: Error <-6> in
function call
[d:\work\project\hlprouting\hrp-scip\hrp_main.cpp:180] ERROR: Error <-6> in
function call
Press any key to continue . . .
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