<div dir="ltr">I would check if there are any inconsistencies on the treatment of the MPS file constraints.<div><br></div><div>This file format has a series os behaviours that are not defined by the standard, so different solvers can interpret the file in different ways.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jun 27, 2017 at 3:32 AM, <span dir="ltr"><<a href="mailto:ycollette.nospam@free.fr" target="_blank">ycollette.nospam@free.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
Finally, the behavior is different, but the result is the same.<br>
No solution found ... yet. Still trying since yesterday.<br>
Sorry for the noise...<br>
<br>
Best regards,<br>
<br>
YC<br>
<span class=""><br>
----- Mail original -----<br>
De: "ycollette nospam" <<a href="mailto:ycollette.nospam@free.fr">ycollette.nospam@free.fr</a>><br>
À: "Stefan Vigerske" <<a href="mailto:stefan@math.hu-berlin.de">stefan@math.hu-berlin.de</a>><br>
Cc: <a href="mailto:cbc@list.coin-or.org">cbc@list.coin-or.org</a><br>
</span>Envoyé: Lundi 26 Juin 2017 16:57:36<br>
<div><div class="h5">Objet: Re: [Cbc] Convergence problem with miplib2010/30n20b8<br>
<br>
With cbc-2.8.9, the behavior is not the same:<br>
<br>
At line 1 NAME 30n20b8<br>
At line 2 ROWS<br>
At line 580 COLUMNS<br>
At line 110291 RHS<br>
At line 110322 BOUNDS<br>
At line 128761 ENDATA<br>
Problem 30n20b8 has 576 rows, 18380 columns and 109706 elements<br>
Coin0008I 30n20b8 read with 0 errors<br>
Continuous objective value is 1.56641 - 0.14 seconds<br>
Cgl0003I 0 fixed, 0 tightened bounds, 3 strengthened rows, 0 substitutions<br>
Cgl0003I 0 fixed, 0 tightened bounds, 2 strengthened rows, 0 substitutions<br>
Cgl0003I 0 fixed, 0 tightened bounds, 2 strengthened rows, 0 substitutions<br>
Cgl0003I 0 fixed, 0 tightened bounds, 2 strengthened rows, 0 substitutions<br>
Cgl0003I 0 fixed, 0 tightened bounds, 2 strengthened rows, 0 substitutions<br>
Cgl0003I 0 fixed, 0 tightened bounds, 2 strengthened rows, 0 substitutions<br>
Cgl0003I 0 fixed, 0 tightened bounds, 2 strengthened rows, 0 substitutions<br>
Cgl0003I 0 fixed, 0 tightened bounds, 2 strengthened rows, 0 substitutions<br>
Cgl0003I 0 fixed, 0 tightened bounds, 2 strengthened rows, 0 substitutions<br>
Cgl0004I processed model has 492 rows, 8028 columns (8028 integer) and 53159 elements<br>
Cutoff increment increased from 1e-05 to 0.9999<br>
Cbc0045I 2 integer variables out of 8028 objects (8028 integer) have costs - high priority<br>
Cbc0045I branch on satisfied N create fake objective Y random cost N<br>
Cbc0038I Pass 1: suminf. 3.17212 (62) obj. 453 iterations 603<br>
Cbc0038I Pass 2: suminf. 2.99989 (62) obj. 453 iterations 9<br>
Cbc0038I Pass 3: suminf. 7.13649 (63) obj. 454.594 iterations 33<br>
Cbc0038I Pass 4: suminf. 6.77913 (63) obj. 454.594 iterations 5<br>
Cbc0038I Pass 5: suminf. 6.84809 (63) obj. 454.594 iterations 5<br>
Cbc0038I Pass 6: suminf. 6.84809 (63) obj. 454.594 iterations 2<br>
Cbc0038I Pass 7: suminf. 11.97326 (67) obj. 487.595 iterations 34<br>
Cbc0038I Pass 8: suminf. 12.45588 (68) obj. 487.595 iterations 7<br>
Cbc0038I Pass 9: suminf. 10.79150 (64) obj. 454.594 iterations 20<br>
Cbc0038I Pass 10: suminf. 11.04126 (66) obj. 454.594 iterations 7<br>
Cbc0038I Pass 11: suminf. 16.54273 (79) obj. 487.595 iterations 26<br>
Cbc0038I Pass 12: suminf. 12.97333 (67) obj. 487.595 iterations 9<br>
Cbc0038I Pass 13: suminf. 11.89674 (67) obj. 454.594 iterations 9<br>
Cbc0038I Pass 14: suminf. 11.89674 (67) obj. 454.594 iterations 2<br>
Cbc0038I Pass 15: suminf. 12.46953 (67) obj. 454.594 iterations 10<br>
Cbc0038I Pass 16: suminf. 12.10175 (68) obj. 454.594 iterations 5<br>
Cbc0038I Pass 17: suminf. 11.55066 (66) obj. 454.594 iterations 7<br>
Cbc0038I Pass 18: suminf. 11.55066 (66) obj. 454.594 iterations 1<br>
Cbc0038I Pass 19: suminf. 12.65707 (69) obj. 454.594 iterations 12<br>
Cbc0038I Pass 20: suminf. 11.72332 (63) obj. 454.594 iterations 9<br>
Cbc0038I Pass 21: suminf. 11.86895 (67) obj. 454.594 iterations 11<br>
Cbc0038I Pass 22: suminf. 11.85620 (63) obj. 454.594 iterations 6<br>
Cbc0038I Pass 23: suminf. 12.40729 (65) obj. 454.594 iterations 5<br>
Cbc0038I Pass 24: suminf. 12.40729 (65) obj. 454.594 iterations 3<br>
Cbc0038I Pass 25: suminf. 12.26679 (64) obj. 487.595 iterations 17<br>
Cbc0038I Pass 26: suminf. 12.39445 (65) obj. 487.595 iterations 5<br>
Cbc0038I Pass 27: suminf. 12.46687 (64) obj. 454.594 iterations 11<br>
Cbc0038I Pass 28: suminf. 12.46687 (64) obj. 454.594 iterations 2<br>
Cbc0038I Pass 29: suminf. 12.83511 (63) obj. 487.595 iterations 24<br>
Cbc0038I Pass 30: suminf. 13.08486 (65) obj. 487.595 iterations 12<br>
Cbc0038I Pass 31: suminf. 12.76438 (68) obj. 454.594 iterations 7<br>
Cbc0038I Pass 32: suminf. 12.76438 (68) obj. 454.594 iterations 5<br>
Cbc0038I Pass 33: suminf. 12.21329 (66) obj. 454.594 iterations 7<br>
Cbc0038I Pass 34: suminf. 12.21329 (66) obj. 454.594 iterations 5<br>
Cbc0038I Pass 35: suminf. 12.76438 (68) obj. 454.594 iterations 5<br>
Cbc0038I Pass 36: suminf. 23.56249 (87) obj. 819.377 iterations 115<br>
Cbc0038I Pass 37: suminf. 13.51225 (65) obj. 1083.94 iterations 83<br>
Cbc0038I Pass 38: suminf. 17.51270 (64) obj. 919.554 iterations 44<br>
Cbc0038I Pass 39: suminf. 19.16697 (68) obj. 922.541 iterations 4<br>
Cbc0038I Pass 40: suminf. 14.91827 (59) obj. 925.252 iterations 8<br>
Cbc0038I Pass 41: suminf. 18.22469 (72) obj. 922.541 iterations 5<br>
Cbc0038I Pass 42: suminf. 16.22472 (66) obj. 922.541 iterations 3<br>
Cbc0038I Pass 43: suminf. 15.14784 (56) obj. 981.175 iterations 20<br>
Cbc0038I Pass 44: suminf. 17.65709 (72) obj. 1003.49 iterations 14<br>
Cbc0038I Pass 45: suminf. 17.94346 (66) obj. 1003.63 iterations 3<br>
Cbc0038I Pass 46: suminf. 18.04894 (61) obj. 957.34 iterations 26<br>
Cbc0038I Pass 47: suminf. 23.72560 (77) obj. 1006 iterations 26<br>
Cbc0038I Pass 48: suminf. 13.41490 (45) obj. 969.188 iterations 11<br>
Cbc0038I Pass 49: suminf. 14.74272 (68) obj. 970.344 iterations 12<br>
Cbc0038I Pass 50: suminf. 13.98395 (66) obj. 970.484 iterations 2<br>
Cbc0038I Pass 51: suminf. 14.16897 (53) obj. 969.188 iterations 15<br>
Cbc0038I Pass 52: suminf. 17.27209 (72) obj. 970.344 iterations 13<br>
Cbc0038I Pass 53: suminf. 13.25309 (66) obj. 970.484 iterations 5<br>
Cbc0038I Pass 54: suminf. 12.83650 (51) obj. 969.188 iterations 20<br>
Cbc0038I Pass 55: suminf. 13.25892 (64) obj. 970.484 iterations 10<br>
Cbc0038I Pass 56: suminf. 12.69114 (49) obj. 969.188 iterations 16<br>
Cbc0038I Pass 57: suminf. 14.01186 (68) obj. 970.344 iterations 11<br>
Cbc0038I Pass 58: suminf. 13.25309 (66) obj. 970.484 iterations 2<br>
Cbc0038I Pass 59: suminf. 12.53574 (48) obj. 965.625 iterations 20<br>
Cbc0038I Pass 60: suminf. 13.25892 (64) obj. 970.484 iterations 11<br>
Cbc0038I Pass 61: suminf. 17.14355 (63) obj. 965.639 iterations 10<br>
Cbc0038I Pass 62: suminf. 14.01186 (68) obj. 970.344 iterations 7<br>
Cbc0038I Pass 63: suminf. 13.25309 (66) obj. 970.484 iterations 2<br>
Cbc0038I Pass 64: suminf. 12.72794 (47) obj. 969.188 iterations 20<br>
Cbc0038I Pass 65: suminf. 13.25892 (64) obj. 970.484 iterations 12<br>
Cbc0038I Pass 66: suminf. 21.32026 (74) obj. 875.111 iterations 17<br>
Cbc0038I Pass 67: suminf. 13.71199 (53) obj. 878.754 iterations 11<br>
Cbc0038I Pass 68: suminf. 18.41747 (73) obj. 889.391 iterations 26<br>
Cbc0038I Pass 69: suminf. 17.35490 (82) obj. 921.06 iterations 9<br>
Cbc0038I Pass 70: suminf. 17.33797 (54) obj. 876.092 iterations 30<br>
Cbc0038I Pass 71: suminf. 16.30169 (60) obj. 877.622 iterations 2<br>
Cbc0038I Pass 72: suminf. 21.02180 (71) obj. 897.327 iterations 22<br>
Cbc0038I Pass 73: suminf. 16.06395 (81) obj. 953.334 iterations 13<br>
Cbc0038I Pass 74: suminf. 16.56708 (52) obj. 826.758 iterations 24<br>
Cbc0038I Pass 75: suminf. 16.89138 (55) obj. 826.758 iterations 9<br>
Cbc0038I Pass 76: suminf. 17.82485 (67) obj. 956.463 iterations 22<br>
Cbc0038I Pass 77: suminf. 13.88599 (85) obj. 1189.8 iterations 7<br>
Cbc0038I Pass 78: suminf. 6.84924 (58) obj. 1275.31 iterations 30<br>
Cbc0038I Pass 79: suminf. 3.73289 (55) obj. 1275.35 iterations 12<br>
Cbc0038I Pass 80: suminf. 2.51824 (49) obj. 1276.78 iterations 11<br>
Cbc0038I Pass 81: suminf. 2.68478 (57) obj. 1276.78 iterations 11<br>
Cbc0038I Pass 82: suminf. 2.65202 (61) obj. 1276.78 iterations 10<br>
Cbc0038I Pass 83: suminf. 19.85141 (66) obj. 754.191 iterations 32<br>
Cbc0038I Pass 84: suminf. 15.89955 (56) obj. 880.929 iterations 14<br>
Cbc0038I Pass 85: suminf. 6.71837 (63) obj. 1127.98 iterations 26<br>
Cbc0038I Pass 86: suminf. 6.38870 (63) obj. 1127.98 iterations 4<br>
Cbc0038I Pass 87: suminf. 2.48647 (57) obj. 1272.33 iterations 24<br>
Cbc0038I Pass 88: suminf. 2.57883 (59) obj. 1276.78 iterations 4<br>
Cbc0038I Pass 89: suminf. 18.09382 (59) obj. 754.191 iterations 32<br>
Cbc0038I Pass 90: suminf. 15.47113 (57) obj. 880.929 iterations 20<br>
Cbc0038I Pass 91: suminf. 5.21086 (66) obj. 1273.08 iterations 39<br>
Cbc0038I Pass 92: suminf. 5.12167 (66) obj. 1275.35 iterations 3<br>
Cbc0038I Pass 93: suminf. 2.73414 (57) obj. 1276.78 iterations 18<br>
Cbc0038I Pass 94: suminf. 2.71826 (61) obj. 1276.78 iterations 5<br>
Cbc0038I Pass 95: suminf. 2.95185 (59) obj. 1276.73 iterations 9<br>
Cbc0038I Pass 96: suminf. 2.70389 (61) obj. 1276.78 iterations 9<br>
Cbc0038I Pass 97: suminf. 18.33131 (59) obj. 754.191 iterations 28<br>
Cbc0038I Pass 98: suminf. 15.95809 (57) obj. 880.929 iterations 18<br>
Cbc0038I Pass 99: suminf. 10.45759 (69) obj. 1089.37 iterations 13<br>
Cbc0038I Pass 100: suminf. 26.36431 (94) obj. 600.375 iterations 117<br>
Cbc0038I No solution found this major pass<br>
Cbc0038I Before mini branch and bound, 7645 integers at bound fixed and 0 continuous<br>
Cbc0038I Full problem 492 rows 8028 columns, reduced to 347 rows 383 columns<br>
Cbc0038I Mini branch and bound did not improve solution (3.07 seconds)<br>
Cbc0038I After 3.07 seconds - Feasibility pump exiting - took 0.91 seconds<br>
Cbc0031I 66 added rows had average density of 186.28788<br>
Cbc0013I At root node, 66 cuts changed objective from 43.335573 to 79.854439 in 20 passes<br>
Cbc0014I Cut generator 0 (Probing) - 288 row cuts average 158.4 elements, 0 column cuts (60 active) in 1.329 seconds - new frequency is 1<br>
Cbc0014I Cut generator 1 (Gomory) - 6 row cuts average 263.2 elements, 0 column cuts (0 active) in 0.298 seconds - new frequency is -100<br>
Cbc0014I Cut generator 2 (Knapsack) - 0 row cuts average 0.0 elements, 0 column cuts (0 active) in 0.042 seconds - new frequency is -100<br>
Cbc0014I Cut generator 3 (Clique) - 0 row cuts average 0.0 elements, 0 column cuts (0 active) in 0.005 seconds - new frequency is -100<br>
Cbc0014I Cut generator 4 (MixedIntegerRounding2) - 47 row cuts average 222.6 elements, 0 column cuts (0 active) in 0.076 seconds - new frequency is 1<br>
Cbc0014I Cut generator 6 (TwoMirCuts) - 72 row cuts average 225.8 elements, 0 column cuts (0 active) in 0.162 seconds - new frequency is 1<br>
Cbc0010I After 0 nodes, 1 on tree, 1e+50 best solution, best possible 79.854439 (6.60 seconds)<br>
Cbc0010I After 100 nodes, 25 on tree, 1e+50 best solution, best possible 129.18871 (10.81 seconds)<br>
Cbc0010I After 200 nodes, 32 on tree, 1e+50 best solution, best possible 129.18871 (12.10 seconds)<br>
Cbc0010I After 300 nodes, 64 on tree, 1e+50 best solution, best possible 129.18871 (13.03 seconds)<br>
Cbc0010I After 400 nodes, 80 on tree, 1e+50 best solution, best possible 129.18871 (14.03 seconds)<br>
Cbc0010I After 500 nodes, 73 on tree, 1e+50 best solution, best possible 129.18871 (15.55 seconds)<br>
Cbc0010I After 600 nodes, 35 on tree, 1e+50 best solution, best possible 129.18871 (16.44 seconds)<br>
Cbc0010I After 700 nodes, 53 on tree, 1e+50 best solution, best possible 129.18871 (17.35 seconds)<br>
Cbc0010I After 800 nodes, 38 on tree, 1e+50 best solution, best possible 129.18871 (18.07 seconds)<br>
Cbc0010I After 900 nodes, 49 on tree, 1e+50 best solution, best possible 129.18871 (19.29 seconds)<br>
Cbc0010I After 1000 nodes, 101 on tree, 1e+50 best solution, best possible 129.18871 (20.64 seconds)<br>
Cbc0010I After 1100 nodes, 134 on tree, 1e+50 best solution, best possible 151 (21.86 seconds)<br>
Cbc0004I Integer solution of 653 found after 21627 iterations and 1102 nodes (21.94 seconds)<br>
Cbc0038I Full problem 492 rows 8028 columns, reduced to 195 rows 133 columns<br>
Cbc0010I After 1200 nodes, 112 on tree, 653 best solution, best possible 151 (28.40 seconds)<br>
Cbc0038I Full problem 492 rows 8028 columns, reduced to 224 rows 162 columns<br>
Cbc0010I After 1300 nodes, 121 on tree, 653 best solution, best possible 151 (31.81 seconds)<br>
Cbc0010I After 1400 nodes, 142 on tree, 653 best solution, best possible 151 (37.18 seconds)<br>
Cbc0038I Full problem 492 rows 8028 columns, reduced to 170 rows 112 columns<br>
Cbc0010I After 1500 nodes, 156 on tree, 653 best solution, best possible 151 (40.59 seconds)<br>
Cbc0038I Full problem 492 rows 8028 columns, reduced to 238 rows 151 columns<br>
Cbc0010I After 1600 nodes, 175 on tree, 653 best solution, best possible 151 (44.80 seconds)<br>
Cbc0010I After 1700 nodes, 212 on tree, 653 best solution, best possible 151 (53.68 seconds)<br>
<br>
<br>
<br>
----- Mail original -----<br>
De: "ycollette nospam" <<a href="mailto:ycollette.nospam@free.fr">ycollette.nospam@free.fr</a>><br>
À: "Stefan Vigerske" <<a href="mailto:stefan@math.hu-berlin.de">stefan@math.hu-berlin.de</a>><br>
Cc: <a href="mailto:cbc@list.coin-or.org">cbc@list.coin-or.org</a><br>
Envoyé: Lundi 26 Juin 2017 16:46:49<br>
Objet: Re: [Cbc] Convergence problem with miplib2010/30n20b8<br>
<br>
I know the differences between MIP and LP. But I remember that with an old version of cbc it worked before the timeout of 300 sec I fixed for this test.<br>
<br>
----- Mail original -----<br>
De: "Stefan Vigerske" <<a href="mailto:stefan@math.hu-berlin.de">stefan@math.hu-berlin.de</a>><br>
À: <a href="mailto:cbc@list.coin-or.org">cbc@list.coin-or.org</a><br>
Envoyé: Lundi 26 Juin 2017 16:44:34<br>
Objet: Re: [Cbc] Convergence problem with miplib2010/30n20b8<br>
<br>
Maybe I missed some recent breakthrough in the world of optimization,<br>
but just because Clp is able to solve the LP relaxation of 30n20b8<br>
quickly, one cannot be sure that Cbc will quickly find a feasible<br>
solution to the MIP.<br>
<br>
On 06/26/2017 04:39 PM, <a href="mailto:ycollette.nospam@free.fr">ycollette.nospam@free.fr</a> wrote:<br>
> The missing part of cbc:<br>
><br>
> At line 1 NAME 30n20b8<br>
> At line 2 ROWS<br>
> At line 580 COLUMNS<br>
> At line 110291 RHS<br>
> At line 110322 BOUNDS<br>
> At line 128761 ENDATA<br>
> Problem 30n20b8 has 576 rows, 18380 columns and 109706 elements<br>
> Coin0008I 30n20b8 read with 0 errors<br>
> Continuous objective value is 1.56641 - 0.10 seconds<br>
> Cgl0004I processed model has 491 rows, 8028 columns (8028 integer (7971 of which binary)) and 53138 elements<br>
> Cutoff increment increased from 1e-05 to 0.9999<br>
> Cbc0045I 2 integer variables out of 8028 objects (8028 integer) have costs - high priority<br>
> Cbc0045I branch on satisfied Y create fake objective Y random cost Y<br>
> Cbc0038I Initial state - 196 integers unsatisfied sum - 33.5079<br>
> Cbc0038I Pass 1: suminf. 3.44346 (60) obj. 453 iterations 582<br>
> Cbc0038I Pass 2: suminf. 3.34653 (60) obj. 453 iterations 19<br>
> Cbc0038I Pass 3: suminf. 7.03585 (60) obj. 454.594 iterations 35<br>
> Cbc0038I Pass 4: suminf. 7.03585 (60) obj. 454.594 iterations 10<br>
> Cbc0038I Pass 5: suminf. 7.10415 (59) obj. 454.594 iterations 8<br>
> Cbc0038I Pass 6: suminf. 7.10415 (59) obj. 454.594 iterations 4<br>
> Cbc0038I Pass 7: suminf. 10.14507 (56) obj. 454.594 iterations 32<br>
> Cbc0038I Pass 8: suminf. 9.78964 (61) obj. 454.594 iterations 14<br>
> Cbc0038I Pass 9: suminf. 10.94741 (58) obj. 454.594 iterations 22<br>
> Cbc0038I Pass 10: suminf. 11.40422 (62) obj. 454.594 iterations 12<br>
> Cbc0038I Pass 11: suminf. 23.07154 (82) obj. 499.914 iterations 27<br>
> Cbc0038I Pass 12: suminf. 12.18306 (60) obj. 487.595 iterations 19<br>
> Cbc0038I Pass 13: suminf. 12.18306 (60) obj. 487.595 iterations 2<br>
> Cbc0038I Pass 14: suminf. 12.19694 (61) obj. 454.594 iterations 15<br>
> Cbc0038I Pass 15: suminf. 12.26858 (62) obj. 454.594 iterations 9<br>
> Cbc0038I Pass 16: suminf. 12.59845 (64) obj. 454.594 iterations 7<br>
> Cbc0038I Pass 17: suminf. 12.59845 (64) obj. 454.594 iterations 5<br>
> Cbc0038I Pass 18: suminf. 16.19725 (74) obj. 487.595 iterations 17<br>
> Cbc0038I Pass 19: suminf. 12.66110 (61) obj. 487.595 iterations 10<br>
> Cbc0038I Pass 20: suminf. 15.78065 (85) obj. 454.594 iterations 25<br>
> Cbc0038I Pass 21: suminf. 12.49605 (63) obj. 454.594 iterations 18<br>
> Cbc0038I Pass 22: suminf. 12.49605 (63) obj. 454.594 iterations 2<br>
> Cbc0038I Pass 23: suminf. 14.74148 (72) obj. 454.594 iterations 9<br>
> Cbc0038I Pass 24: suminf. 12.85834 (63) obj. 454.594 iterations 7<br>
> Cbc0038I Pass 25: suminf. 14.77824 (70) obj. 454.594 iterations 14<br>
> Cbc0038I Pass 26: suminf. 12.03422 (61) obj. 454.594 iterations 12<br>
> Cbc0038I Pass 27: suminf. 12.03422 (61) obj. 454.594 iterations 2<br>
> Cbc0038I Pass 28: suminf. 12.51226 (62) obj. 454.594 iterations 8<br>
> Cbc0038I Pass 29: suminf. 12.51226 (62) obj. 454.594 iterations 5<br>
> Cbc0038I Pass 30: suminf. 21.85301 (81) obj. 454.594 iterations 10<br>
> Cbc0038I Pass 31: suminf. 12.03422 (61) obj. 454.594 iterations 10<br>
> Cbc0038I Pass 32: suminf. 12.03422 (61) obj. 454.594 iterations 2<br>
> Cbc0038I Pass 33: suminf. 14.74148 (72) obj. 454.594 iterations 10<br>
> Cbc0038I Pass 34: suminf. 12.85834 (63) obj. 454.594 iterations 6<br>
> Cbc0038I Pass 35: suminf. 14.41276 (72) obj. 454.594 iterations 7<br>
> Cbc0038I Pass 36: suminf. 12.84212 (64) obj. 454.594 iterations 6<br>
> Cbc0038I Pass 37: suminf. 15.02805 (72) obj. 454.594 iterations 10<br>
> Cbc0038I Pass 38: suminf. 20.44714 (95) obj. 925.549 iterations 126<br>
> Cbc0038I Pass 39: suminf. 16.41279 (71) obj. 983.301 iterations 62<br>
> Cbc0038I Pass 40: suminf. 13.27421 (65) obj. 973.911 iterations 30<br>
> Cbc0038I Pass 41: suminf. 9.79846 (50) obj. 973.74 iterations 3<br>
> Cbc0038I Pass 42: suminf. 12.51723 (48) obj. 693.605 iterations 18<br>
> Cbc0038I Pass 43: suminf. 12.70067 (53) obj. 713.45 iterations 15<br>
> Cbc0038I Pass 44: suminf. 11.23859 (51) obj. 713.45 iterations 14<br>
> Cbc0038I Pass 45: suminf. 11.45577 (50) obj. 713.45 iterations 8<br>
> Cbc0038I Pass 46: suminf. 15.45592 (58) obj. 717.459 iterations 27<br>
> Cbc0038I Pass 47: suminf. 14.36702 (56) obj. 794.134 iterations 18<br>
> Cbc0038I Pass 48: suminf. 13.47185 (54) obj. 794.134 iterations 3<br>
> Cbc0038I Pass 49: suminf. 15.50911 (58) obj. 717.459 iterations 21<br>
> Cbc0038I Pass 50: suminf. 14.37117 (56) obj. 798.021 iterations 18<br>
> Cbc0038I Pass 51: suminf. 13.47600 (54) obj. 798.021 iterations 3<br>
> Cbc0038I Pass 52: suminf. 22.68284 (84) obj. 846.461 iterations 128<br>
> Cbc0038I Pass 53: suminf. 18.57079 (72) obj. 887.407 iterations 59<br>
> Cbc0038I Pass 54: suminf. 18.43260 (72) obj. 862.071 iterations 21<br>
> Cbc0038I Pass 55: suminf. 19.74845 (78) obj. 873.792 iterations 12<br>
> Cbc0038I Pass 56: suminf. 19.06775 (69) obj. 863.075 iterations 15<br>
> Cbc0038I Pass 57: suminf. 13.50916 (52) obj. 891.173 iterations 10<br>
> Cbc0038I Pass 58: suminf. 22.87530 (75) obj. 988.677 iterations 20<br>
> Cbc0038I Pass 59: suminf. 18.28259 (67) obj. 988.677 iterations 7<br>
> Cbc0038I Pass 60: suminf. 13.99150 (58) obj. 1094.75 iterations 18<br>
> Cbc0038I Pass 61: suminf. 15.40796 (61) obj. 1267.08 iterations 18<br>
> Cbc0038I Pass 62: suminf. 7.88882 (46) obj. 1340.87 iterations 5<br>
> Cbc0038I Pass 63: suminf. 13.54525 (55) obj. 1196.52 iterations 16<br>
> Cbc0038I Pass 64: suminf. 8.41569 (57) obj. 1295.73 iterations 19<br>
> Cbc0038I Pass 65: suminf. 9.96606 (64) obj. 1295.73 iterations 15<br>
> Cbc0038I Pass 66: suminf. 10.37178 (62) obj. 1295.73 iterations 3<br>
> Cbc0038I Pass 67: suminf. 11.56677 (60) obj. 1295.73 iterations 17<br>
> Cbc0038I Pass 68: suminf. 11.55920 (62) obj. 1295.73 iterations 8<br>
> Cbc0038I Pass 69: suminf. 11.01049 (70) obj. 1295.73 iterations 11<br>
> Cbc0038I Pass 70: suminf. 7.48935 (55) obj. 1295.73 iterations 7<br>
> Cbc0038I Pass 71: suminf. 10.84838 (58) obj. 1297.3 iterations 14<br>
> Cbc0038I Pass 72: suminf. 10.91403 (60) obj. 1295.73 iterations 1<br>
> Cbc0038I Pass 73: suminf. 8.88900 (72) obj. 1268.52 iterations 8<br>
> Cbc0038I Pass 74: suminf. 8.83585 (75) obj. 1312.12 iterations 5<br>
> Cbc0038I Pass 75: suminf. 5.77727 (73) obj. 1348.14 iterations 11<br>
> Cbc0038I Pass 76: suminf. 2.40838 (45) obj. 1351.23 iterations 30<br>
> Cbc0038I Pass 77: suminf. 2.50573 (46) obj. 1350.17 iterations 5<br>
> Cbc0038I Pass 78: suminf. 3.43292 (43) obj. 1178.68 iterations 25<br>
> Cbc0038I Pass 79: suminf. 1.68753 (47) obj. 1178.68 iterations 25<br>
> Cbc0038I Pass 80: suminf. 10.49116 (53) obj. 1178.46 iterations 30<br>
> Cbc0038I Pass 81: suminf. 5.19409 (53) obj. 1275.35 iterations 41<br>
> Cbc0038I Pass 82: suminf. 4.34798 (52) obj. 1275.35 iterations 5<br>
> Cbc0038I Pass 83: suminf. 2.30426 (42) obj. 1254.5 iterations 31<br>
> Cbc0038I Pass 84: suminf. 1.66459 (45) obj. 1275.35 iterations 26<br>
> Cbc0038I Pass 85: suminf. 9.65069 (55) obj. 1178.46 iterations 29<br>
> Cbc0038I Pass 86: suminf. 6.36467 (54) obj. 1222.02 iterations 27<br>
> Cbc0038I Pass 87: suminf. 2.13080 (48) obj. 1275.35 iterations 24<br>
> Cbc0038I Pass 88: suminf. 2.13080 (48) obj. 1275.35 iterations 0<br>
> Cbc0038I Pass 89: suminf. 9.97728 (55) obj. 1178.46 iterations 35<br>
> Cbc0038I Pass 90: suminf. 7.67562 (57) obj. 1222.02 iterations 36<br>
> Cbc0038I Pass 91: suminf. 3.16010 (50) obj. 1275.35 iterations 19<br>
> Cbc0038I Pass 92: suminf. 2.38080 (50) obj. 1275.35 iterations 6<br>
> Cbc0038I Pass 93: suminf. 3.74856 (53) obj. 1243.41 iterations 38<br>
> Cbc0038I Pass 94: suminf. 1.71964 (46) obj. 1275.35 iterations 38<br>
> Cbc0038I Pass 95: suminf. 2.34377 (42) obj. 1254.5 iterations 21<br>
> Cbc0038I Pass 96: suminf. 1.53098 (39) obj. 1275.35 iterations 21<br>
> Cbc0038I Pass 97: suminf. 9.55188 (55) obj. 1178.46 iterations 31<br>
> Cbc0038I Pass 98: suminf. 7.80986 (51) obj. 1222.02 iterations 26<br>
> Cbc0038I Pass 99: suminf. 2.83396 (43) obj. 1178.68 iterations 43<br>
> Cbc0038I Pass 100: suminf. 24.56681 (92) obj. 858.79 iterations 124<br>
> Cbc0038I No solution found this major pass<br>
> Cbc0038I Before mini branch and bound, 7605 integers at bound fixed and 0 continuous<br>
> Cbc0038I Full problem 491 rows 8028 columns, reduced to 366 rows 423 columns<br>
> Cbc0038I Mini branch and bound did not improve solution (1.40 seconds)<br>
> Cbc0038I After 1.40 seconds - Feasibility pump exiting - took 0.90 seconds<br>
> Cbc0031I 59 added rows had average density of 233.55932<br>
> Cbc0013I At root node, 59 cuts changed objective from 43.335573 to 86.107549 in 20 passes<br>
> Cbc0014I Cut generator 0 (Probing) - 283 row cuts average 172.1 elements, 0 column cuts (0 active) in 1.356 seconds - new frequency is 1<br>
> Cbc0014I Cut generator 1 (Gomory) - 15 row cuts average 743.3 elements, 0 column cuts (0 active) in 0.314 seconds - new frequency is -100<br>
> Cbc0014I Cut generator 2 (Knapsack) - 0 row cuts average 0.0 elements, 0 column cuts (0 active) in 0.049 seconds - new frequency is -100<br>
> Cbc0014I Cut generator 3 (Clique) - 0 row cuts average 0.0 elements, 0 column cuts (0 active) in 0.007 seconds - new frequency is -100<br>
> Cbc0014I Cut generator 4 (MixedIntegerRounding2) - 50 row cuts average 224.3 elements, 0 column cuts (0 active) in 0.088 seconds - new frequency is 1<br>
> Cbc0014I Cut generator 5 (FlowCover) - 0 row cuts average 0.0 elements, 0 column cuts (0 active) in 0.104 seconds - new frequency is -100<br>
> Cbc0014I Cut generator 6 (TwoMirCuts) - 78 row cuts average 236.0 elements, 0 column cuts (0 active) in 0.179 seconds - new frequency is 1<br>
> Cbc0027I Exiting on user event<br>
> Cbc0005I Partial search - best objective 1e+50 (best possible 86.107549), took 5432 iterations and 0 nodes (5.24 seconds)<br>
><br>
><br>
><br>
> ----- Mail original -----<br>
> De: "Fausto Richetti Blanco" <<a href="mailto:fausto.blanco@gmail.com">fausto.blanco@gmail.com</a>><br>
> À: "ycollette nospam" <<a href="mailto:ycollette.nospam@free.fr">ycollette.nospam@free.fr</a>><br>
> Cc: "cbc" <<a href="mailto:cbc@list.coin-or.org">cbc@list.coin-or.org</a>><br>
> Envoyé: Lundi 26 Juin 2017 16:35:11<br>
> Objet: Re: [Cbc] Convergence problem with miplib2010/30n20b8<br>
><br>
><br>
> CLP:<br>
> Problem 30n20b8 has 576 rows, 18380 columns and 109706 elements<br>
><br>
> CBS:<br>
> Cbc0038I Full problem 491 rows 8028 columns, reduced to 366 rows 423 columns<br>
><br>
><br>
><br>
> Are you sure you're comparing the same problem?<br>
><br>
><br>
><br>
><br>
> On Mon, Jun 26, 2017 at 11:30 AM, < <a href="mailto:ycollette.nospam@free.fr">ycollette.nospam@free.fr</a> > wrote:<br>
><br>
><br>
> At the beginning of the cbc run, I got this in the logs:<br>
><br>
> Cbc0038I Full problem 491 rows 8028 columns, reduced to 366 rows 423 columns<br>
> Cbc0038I Mini branch and bound did not improve solution (1.51 seconds)<br>
> Cbc0038I After 1.51 seconds - Feasibility pump exiting - took 0.98 seconds<br>
> Cbc0031I 59 added rows had average density of 233.55932<br>
> Cbc0013I At root node, 59 cuts changed objective from 43.335573 to 86.107549 in 20 passes<br>
> Cbc0014I Cut generator 0 (Probing) - 283 row cuts average 172.1 elements, 0 column cuts (0 active) in 1.322 seconds - new frequency is 1<br>
> Cbc0014I Cut generator 1 (Gomory) - 15 row cuts average 743.3 elements, 0 column cuts (0 active) in 0.283 seconds - new frequency is -100<br>
> Cbc0014I Cut generator 2 (Knapsack) - 0 row cuts average 0.0 elements, 0 column cuts (0 active) in 0.045 seconds - new frequency is -100<br>
> Cbc0014I Cut generator 3 (Clique) - 0 row cuts average 0.0 elements, 0 column cuts (0 active) in 0.005 seconds - new frequency is -100<br>
> Cbc0014I Cut generator 4 (MixedIntegerRounding2) - 50 row cuts average 224.3 elements, 0 column cuts (0 active) in 0.075 seconds - new frequency is 1<br>
> Cbc0014I Cut generator 5 (FlowCover) - 0 row cuts average 0.0 elements, 0 column cuts (0 active) in 0.092 seconds - new frequency is -100<br>
> Cbc0014I Cut generator 6 (TwoMirCuts) - 78 row cuts average 236.0 elements, 0 column cuts (0 active) in 0.169 seconds - new frequency is 1<br>
><br>
><br>
> ----- Mail original -----<br>
> De: "ycollette nospam" < <a href="mailto:ycollette.nospam@free.fr">ycollette.nospam@free.fr</a> ><br>
> À: "cbc" < <a href="mailto:cbc@list.coin-or.org">cbc@list.coin-or.org</a> ><br>
> Envoyé: Lundi 26 Juin 2017 16:28:31<br>
> Objet: [Cbc] Convergence problem with miplib2010/30n20b8<br>
><br>
><br>
><br>
> Hello,<br>
><br>
> I am trying to run somes tests from miplib2010. And I meet some strange behavior.<br>
> If I run clp on 30n20b8.mps without specific options, it converges quickly to a solution:<br>
><br>
> At line 1 NAME 30n20b8<br>
> At line 2 ROWS<br>
> At line 580 COLUMNS<br>
> At line 110291 RHS<br>
> At line 110322 BOUNDS<br>
> At line 128761 ENDATA<br>
> Problem 30n20b8 has 576 rows, 18380 columns and 109706 elements<br>
> Model was imported from /home/artelys/repository/coin/<wbr>Cbc/build/Dependencies/.//<wbr>MIPLIB2000/src/EP_MIPLIB2000/<wbr>instances/miplib2010/30n20b8.<wbr>mps.gz in 0.114319 seconds<br>
> Presolve 493 (-83) rows, 11093 (-7287) columns and 63118 (-46588) elements<br>
> Perturbing problem by 0.001%%of 301.52267 - largest nonzero change 0.00028965583 ( 9.6064362e-05%%) - largest zero change 0.00028962251<br>
> 0 Obj 0.041886881 Primal inf 253.60538 (88)<br>
> 78 Obj 0.044696222 Primal inf 359.4158 (159)<br>
> 142 Obj 0.04542365 Primal inf 105.42604 (119)<br>
> 214 Obj 0.045885186 Primal inf 83.292978 (114)<br>
> 298 Obj 0.046155092 Primal inf 32.89186 (74)<br>
> 380 Obj 0.048508765 Primal inf 87.130897 (64)<br>
> 464 Obj 0.057466585 Primal inf 99.796642 (62)<br>
> 548 Obj 0.068410705 Primal inf 276.03475 (64)<br>
> 632 Obj 0.077664609 Primal inf 167.63095 (63)<br>
> 716 Obj 0.08533722 Primal inf 123.90711 (47)<br>
> 800 Obj 0.093453993 Primal inf 94.340415 (35)<br>
> 884 Obj 1.079625 Primal inf 0.56385768 (23)<br>
> 950 Obj 1.669254<br>
> Optimal - objective value 1.5664076<br>
> After Postsolve, objective 1.5664076, infeasibilities - dual 0 (0), primal 0 (0)<br>
> Optimal objective 1.566407646 - 950 iterations time 0.112, Presolve 0.03<br>
><br>
><br>
><br>
> Now, If I run cbc on this problem, it never stops.<br>
> An example of the log I've got:<br>
><br>
> Cbc0010I After 91600 nodes, 675 on tree, 1e+50 best solution, best possible 202 (1278.41 seconds)<br>
> Cbc0010I After 91700 nodes, 626 on tree, 1e+50 best solution, best possible 202 (1279.79 seconds)<br>
> Cbc0010I After 91800 nodes, 724 on tree, 1e+50 best solution, best possible 202 (1281.46 seconds)<br>
> Cbc0010I After 91900 nodes, 805 on tree, 1e+50 best solution, best possible 202 (1283.06 seconds)<br>
> Cbc0010I After 92000 nodes, 709 on tree, 1e+50 best solution, best possible 202 (1284.15 seconds)<br>
><br>
><br>
> I feel the number of best solutions is quite strange: 1e+50 (this number never changes).<br>
><br>
> I performed these tests on the trunk version of cbc. I will try the same test on an older version of cbc.<br>
><br>
> Best regards,<br>
><br>
> YC<br>
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