Gurobi 求解器在使用 Pyomo 找到最佳解决方案后陷入“根单纯形”答案

【问题标题】：Gurobi solver gets stuck in "Root Simplex" after finding optimal solution using PyomoGurobi 求解器在使用 Pyomo 找到最佳解决方案后陷入“根单纯形”
【发布时间】：2021-09-27 11:34:02
【问题描述】：

我不确定这个问题是否适合 StackOverflow，因为它也可能是 Gurobi 问题。我有一个大型混合整数线性规划模型，它使用 Gurobi 可以很好地解决某些输入。但是，有时 Gurobi 找到了最佳解决方案，但从未完成优化，并且似乎在显示结果之前卡在了最后一步。它只是在这一步停止记录或做任何事情：

Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
  428736   -4.0861847e+06   0.000000e+00   0.000000e+00    928s
  428736   -4.0861847e+06   0.000000e+00   0.000000e+00    931s

根据 Primal Inf 的 gurobi 文档归零。和双Inf。表明优化成功完成，它应该继续处理结果，这对我没有用。有没有人经历过这样的事情？如果是，您是如何解决的？

非常感谢您的帮助！

阿克塞尔

先附上完整的 gurobi 日志，然后再附上数字问题（忽略不同的最佳目标，涉及不同的输入）：

Reading time = 51.00 seconds
x6132333: 4380233 rows, 5606696 columns, 19863046 nonzeros
Changed value of parameter NodefileStart to 0.5
   Prev: inf  Min: 0.0  Max: inf  Default: inf
Gurobi Optimizer version 9.1.1 build v9.1.1rc0 (win64)
Thread count: 4 physical cores, 8 logical processors, using up to 8 threads
Optimize a model with 4380233 rows, 5606696 columns and 19863046 nonzeros
Model fingerprint: 0x17dfc5bb
Variable types: 5431496 continuous, 175200 integer (175200 binary)
Coefficient statistics:
  Matrix range     [1e-03, 1e+05]
  Objective range  [4e-01, 1e+00]
  Bounds range     [1e+00, 1e+00]
  RHS range        [6e-01, 1e+05]
Presolve removed 2497233 rows and 2760350 columns (presolve time = 7s) ...
Presolve removed 2956433 rows and 3219550 columns (presolve time = 10s) ...
Presolve removed 2956433 rows and 3219550 columns (presolve time = 15s) ...
Presolve removed 2956433 rows and 3219550 columns (presolve time = 22s) ...
Presolve removed 2956433 rows and 3219550 columns (presolve time = 29s) ...
Presolve removed 2956433 rows and 3219550 columns
Presolve time: 28.91s
Presolved: 1423800 rows, 2387146 columns, 7371279 nonzeros
Variable types: 2387146 continuous, 0 integer (0 binary)

Deterministic concurrent LP optimizer: primal simplex, dual simplex, and barrier
Showing barrier log only...

Root barrier log...

Ordering time: 0.49s

Barrier statistics:
 Dense cols : 6
 AA' NZ     : 5.240e+06
 Factor NZ  : 2.070e+07 (roughly 1.7 GBytes of memory)
 Factor Ops : 3.802e+08 (less than 1 second per iteration)
 Threads    : 2

                  Objective                Residual
Iter       Primal          Dual         Primal    Dual     Compl     Time
   0  -7.96402087e+09  6.37761100e+09  1.38e+08 2.46e+00  2.76e+06    54s
   1  -5.94227013e+09  6.25214767e+09  9.98e+07 6.98e+01  1.88e+06    56s
   2  -4.33580986e+09  6.30244644e+09  7.05e+07 1.69e+01  1.24e+06    58s
   3  -3.89766275e+09  1.13309314e+10  6.44e+07 8.59e+00  1.22e+06    60s
   4  -2.13922340e+09  1.15274975e+10  3.06e+07 4.72e+00  5.81e+05    64s
   5  -1.34252657e+09  1.21554436e+10  1.25e+07 7.46e-01  2.35e+05    66s
   6  -8.70308400e+08  1.19616415e+10  6.19e+06 5.41e-02  1.15e+05    68s
   7  -8.23052754e+08  1.15804774e+10  5.63e+06 2.87e-02  1.03e+05    70s
   8  -7.18259717e+08  1.11971437e+10  3.93e+06 1.48e-02  7.20e+04    72s
   9  -6.14880956e+08  1.05514145e+10  2.27e+06 6.68e-03  4.18e+04    74s
  10  -2.87973249e+08  8.21789507e+09  1.74e+05 4.88e-07  4.52e+03    75s
  11  -1.14443932e+08  2.98342594e+09  3.51e+04 3.29e-07  1.02e+03    77s
  12  -9.83082800e+07  1.81791990e+09  2.26e+04 1.99e-07  5.85e+02    79s
  13  -7.98538149e+07  1.12632964e+09  1.62e+04 1.10e-07  3.55e+02    81s
  14  -7.40060248e+07  9.38255705e+08  1.38e+04 9.07e-08  2.90e+02    83s
  15  -5.70358448e+07  7.58113891e+08  7.52e+03 6.94e-08  2.05e+02    85s
  16  -5.38442966e+07  7.48524984e+08  6.82e+03 6.86e-08  1.99e+02    88s
  17  -3.96209289e+07  6.31776871e+08  3.41e+03 5.70e-08  1.56e+02    91s
  18  -3.35024686e+07  5.90860057e+08  3.50e+00 5.28e-08  1.41e+02    94s
  19  -2.45797994e+07  2.03056861e+08  2.30e+00 1.53e-08  5.07e+01    99s
  20  -1.53792929e+07  3.92734746e+07  1.17e+00 1.63e-09  1.17e+01   102s
  21  -1.04398368e+07  1.27747764e+07  6.27e-01 9.34e-10  4.83e+00   105s
  22  -6.93026339e+06  5.73390984e+06  2.98e-01 4.81e-10  2.58e+00   107s
  23  -6.54744053e+06  2.77192760e+06  2.66e-01 3.03e-10  1.89e+00   109s
  24  -5.17200122e+06  7.65982514e+05  1.55e-01 2.23e-10  1.20e+00   111s
  25  -4.92172096e+06 -6.97616280e+05  1.35e-01 1.36e-10  8.50e-01   113s
  26  -4.36714053e+06 -1.40675070e+06  9.05e-02 1.05e-10  5.95e-01   115s
  27  -4.04669015e+06 -2.25777348e+06  6.47e-02 4.82e-11  3.59e-01   117s
  28  -3.75439120e+06 -2.60591950e+06  4.20e-02 4.17e-11  2.30e-01   120s
  29  -3.60373763e+06 -2.85673836e+06  3.06e-02 2.33e-11  1.50e-01   123s
  30  -3.50975398e+06 -2.96490882e+06  2.27e-02 1.64e-11  1.09e-01   126s
  31  -3.44481481e+06 -3.05661234e+06  1.71e-02 6.23e-12  7.77e-02   129s
  32  -3.41209626e+06 -3.09530195e+06  1.41e-02 1.29e-10  6.34e-02   131s
  33  -3.38231320e+06 -3.11178512e+06  1.16e-02 8.10e-12  5.41e-02   133s
  34  -3.35525731e+06 -3.14352761e+06  9.42e-03 2.04e-10  4.24e-02   136s
  35  -3.32615252e+06 -3.17584264e+06  6.86e-03 1.63e-10  3.01e-02   139s
  36  -3.30893392e+06 -3.19769591e+06  5.30e-03 3.01e-10  2.22e-02   143s
  37  -3.29483648e+06 -3.20821569e+06  4.00e-03 2.19e-10  1.73e-02   147s
  38  -3.28214956e+06 -3.22153938e+06  2.81e-03 3.72e-10  1.21e-02   150s
  39  -3.28058920e+06 -3.22508398e+06  2.66e-03 3.33e-10  1.11e-02   154s
  40  -3.27134935e+06 -3.23139910e+06  1.73e-03 2.55e-12  7.99e-03   157s
  41  -3.26658024e+06 -3.23571862e+06  1.26e-03 3.13e-10  6.17e-03   161s
  42  -3.26504758e+06 -3.23932726e+06  1.12e-03 6.84e-10  5.14e-03   165s
  43  -3.26075768e+06 -3.24219157e+06  7.12e-04 1.18e-09  3.71e-03   169s
  44  -3.25857520e+06 -3.24577296e+06  4.92e-04 1.53e-09  2.56e-03   172s
  45  -3.25777564e+06 -3.24768022e+06  4.17e-04 1.47e-09  2.02e-03   177s
  46  -3.25718894e+06 -3.24908419e+06  3.68e-04 1.29e-09  1.62e-03   181s
  47  -3.25665643e+06 -3.24928768e+06  3.21e-04 1.27e-09  1.47e-03   184s
  48  -3.25601298e+06 -3.24958294e+06  2.63e-04 1.19e-09  1.28e-03   187s
  49  -3.25575430e+06 -3.24994390e+06  2.37e-04 1.11e-09  1.16e-03   191s
  50  -3.25525851e+06 -3.25010504e+06  1.92e-04 1.05e-09  1.03e-03   195s
  51  -3.25485639e+06 -3.25040895e+06  1.54e-04 9.83e-10  8.88e-04   199s
  52  -3.25468597e+06 -3.25083749e+06  1.31e-04 8.82e-10  7.69e-04   202s
  53  -3.25432713e+06 -3.25102159e+06  1.01e-04 8.39e-10  6.60e-04   206s
  54  -3.25423403e+06 -3.25120759e+06  9.04e-05 7.72e-10  6.05e-04   210s
  55  -3.25398425e+06 -3.25161450e+06  6.58e-05 6.40e-10  4.73e-04   213s
  56  -3.25376404e+06 -3.25225013e+06  4.31e-05 4.25e-10  3.02e-04   217s
  57  -3.25341893e+06 -3.25260504e+06  7.14e-06 3.97e-10  1.63e-04   221s
  58  -3.25337487e+06 -3.25272062e+06  3.53e-06 5.71e-10  1.31e-04   224s
  59  -3.25335706e+06 -3.25298271e+06  1.56e-06 4.14e-10  7.48e-05   227s
  60  -3.25334256e+06 -3.25319898e+06  8.69e-07 3.76e-10  2.87e-05   229s
  61  -3.25333311e+06 -3.25331716e+06  1.46e-07 5.04e-12  3.19e-06   231s
  62  -3.25333128e+06 -3.25332901e+06  1.32e-08 2.59e-09  4.53e-07   233s
  63  -3.25333104e+06 -3.25333096e+06  3.72e-09 5.05e-10  1.61e-08   235s
  64  -3.25333104e+06 -3.25333097e+06  2.12e-06 4.89e-10  1.47e-08   237s
  65  -3.25333104e+06 -3.25333097e+06  2.12e-06 4.90e-10  1.47e-08   240s
  66  -3.25333104e+06 -3.25333097e+06  2.12e-06 4.91e-10  1.47e-08   242s

Barrier solved model in 66 iterations and 242.12 seconds
Optimal objective -3.25333104e+06


Root crossover log...

  156796 DPushes remaining with DInf 0.0000000e+00               247s
    7788 DPushes remaining with DInf 0.0000000e+00               250s
    6612 DPushes remaining with DInf 0.0000000e+00               255s
    3346 DPushes remaining with DInf 0.0000000e+00               261s
       0 DPushes remaining with DInf 0.0000000e+00               263s

  808250 PPushes remaining with PInf 3.8126575e-05               264s
  278348 PPushes remaining with PInf 6.2504638e-04               266s
   10299 PPushes remaining with PInf 0.0000000e+00               270s
       0 PPushes remaining with PInf 0.0000000e+00               274s

  Push phase complete: Pinf 0.0000000e+00, Dinf 1.0527954e-01    274s


Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
  965029   -3.2533310e+06   0.000000e+00   1.052795e-01    274s
  965072   -3.2533310e+06   0.000000e+00   0.000000e+00    275s
  965072   -3.2533310e+06   0.000000e+00   0.000000e+00    279s

Warning: lp file contains 719280 small (<= 1e-13) coefficient(s), ignored
Read LP format model from file C:\Users\abruck\AppData\Local\Temp\tmpdsd4lney.pyomo.lp
Reading time = 91.43 seconds
x6132333: 4380213 rows, 5606696 columns, 19604266 nonzeros
Changed value of parameter NodefileStart to 0.5
   Prev: inf  Min: 0.0  Max: inf  Default: inf
Gurobi Optimizer version 9.1.1 build v9.1.1rc0 (win64)
Thread count: 4 physical cores, 8 logical processors, using up to 8 threads
Optimize a model with 4380213 rows, 5606696 columns and 19604266 nonzeros
Model fingerprint: 0x109e0bc2
Variable types: 5431496 continuous, 175200 integer (175200 binary)
Coefficient statistics:
  Matrix range     [2e-06, 1e+10]
  Objective range  [4e-01, 1e+00]
  Bounds range     [1e+00, 1e+00]
  RHS range        [1e+00, 1e+10]
Warning: Model contains large matrix coefficient range
Warning: Model contains large rhs
         Consider reformulating model or setting NumericFocus parameter
         to avoid numerical issues.
Presolve removed 2204513 rows and 1657004 columns (presolve time = 5s) ...
Presolve removed 2670233 rows and 3523854 columns (presolve time = 11s) ...
Presolve removed 2802853 rows and 3656474 columns (presolve time = 15s) ...
Presolve removed 2802853 rows and 3656474 columns (presolve time = 20s) ...
Presolve removed 2802853 rows and 3656474 columns (presolve time = 25s) ...
Presolve removed 2802853 rows and 3656474 columns (presolve time = 30s) ...
Presolve removed 2802856 rows and 3656475 columns (presolve time = 36s) ...
Presolve removed 2802856 rows and 3656475 columns (presolve time = 42s) ...
Presolve removed 2802856 rows and 3656475 columns
Presolve time: 42.40s
Presolved: 1577357 rows, 1950221 columns, 6083666 nonzeros
Variable types: 1950221 continuous, 0 integer (0 binary)

Deterministic concurrent LP optimizer: primal simplex, dual simplex, and barrier
Showing barrier log only...

Root barrier log...

Ordering time: 0.67s

Barrier statistics:
 Dense cols : 6
 AA' NZ     : 4.522e+06
 Factor NZ  : 1.898e+07 (roughly 1.6 GBytes of memory)
 Factor Ops : 2.602e+08 (less than 1 second per iteration)
 Threads    : 2

                  Objective                Residual
Iter       Primal          Dual         Primal    Dual     Compl     Time
   0   4.66756102e+08  8.28662239e+09  3.16e+03 1.95e+00  2.63e+05    70s
   1   3.81301676e+08  8.39150150e+09  2.66e+03 2.47e+02  2.09e+05    73s
   2   3.52804651e+08  8.96812797e+09  2.48e+03 1.54e+02  1.87e+05    76s
   3   1.99652991e+08  9.84544646e+09  1.47e+03 3.54e+01  1.03e+05    81s
   4   1.75245055e+08  1.32198725e+10  1.33e+03 1.59e+01  9.12e+04    84s
   5   7.87857037e+06  1.26340222e+10  3.58e+02 7.66e+00  2.73e+04    87s
   6  -3.68083454e+07  9.13818030e+09  7.30e+01 1.46e+00  6.61e+03    89s
   7  -4.64884080e+07  2.53949243e+09  5.15e+00 6.09e-02  7.62e+02    93s
   8  -2.86534817e+07  3.62143236e+08  3.22e-01 6.23e-03  8.86e+01    95s
   9  -1.31745817e+07  4.94519865e+07  5.27e-02 1.49e-04  1.35e+01    99s
  10  -9.56889244e+06  1.01427080e+07  2.36e-02 2.51e-09  4.19e+00   103s
  11  -7.85831330e+06  6.23301053e+06  1.39e-02 2.62e-09  2.98e+00   107s
  12  -6.87760215e+06  3.78096385e+06  9.82e-03 1.43e-09  2.25e+00   110s
  13  -6.26928421e+06  2.21283636e+06  7.55e-03 1.19e-09  1.79e+00   112s
  14  -6.20370885e+06  1.71278836e+06  7.32e-03 1.02e-09  1.67e+00   115s
  15  -5.84606404e+06  8.02903305e+05  6.02e-03 7.06e-10  1.40e+00   118s
  16  -5.57816290e+06  3.70215276e+05  5.07e-03 9.35e-10  1.25e+00   121s
  17  -5.40206466e+06 -7.35046558e+05  4.43e-03 6.17e-10  9.82e-01   126s
  18  -5.16923570e+06 -2.02868063e+06  3.59e-03 5.30e-10  6.60e-01   131s
  19  -4.96598625e+06 -2.43521715e+06  2.87e-03 2.46e-10  5.32e-01   137s
  20  -4.84865323e+06 -3.17242039e+06  2.44e-03 1.41e-10  3.52e-01   142s
  21  -4.46875398e+06 -3.63253764e+06  9.29e-04 1.07e-10  1.75e-01   147s
  22  -4.33246190e+06 -3.84588891e+06  4.82e-04 2.72e-11  1.02e-01   153s
  23  -4.25735255e+06 -3.93282549e+06  2.51e-04 2.81e-11  6.80e-02   157s
  24  -4.24372118e+06 -3.94786201e+06  2.14e-04 4.25e-11  6.20e-02   161s
  25  -4.23188503e+06 -3.96004133e+06  1.78e-04 3.26e-11  5.70e-02   163s
  26  -4.22403271e+06 -3.97234871e+06  1.56e-04 5.52e-12  5.27e-02   166s
  27  -4.20536512e+06 -3.98751836e+06  1.26e-04 4.23e-11  4.57e-02   169s
  28  -4.18118987e+06 -3.99888501e+06  9.91e-05 4.49e-12  3.82e-02   172s
  29  -4.16846050e+06 -4.01417853e+06  8.55e-05 1.13e-11  3.23e-02   177s
  30  -4.15973236e+06 -4.02560500e+06  7.61e-05 1.67e-11  2.81e-02   181s
  31  -4.15167573e+06 -4.04031662e+06  6.77e-05 8.73e-11  2.33e-02   185s
  32  -4.13871183e+06 -4.04798211e+06  5.41e-05 7.44e-12  1.90e-02   190s
  33  -4.13152745e+06 -4.05726696e+06  4.63e-05 2.01e-11  1.56e-02   195s
  34  -4.12815625e+06 -4.05877485e+06  4.26e-05 2.67e-11  1.45e-02   199s
  35  -4.12306010e+06 -4.06262189e+06  3.77e-05 3.00e-11  1.27e-02   203s
  36  -4.11945299e+06 -4.06367543e+06  3.34e-05 5.10e-11  1.17e-02   207s
  37  -4.11615374e+06 -4.06905375e+06  3.01e-05 4.84e-11  9.87e-03   211s
  38  -4.11151574e+06 -4.07136059e+06  2.54e-05 3.37e-11  8.41e-03   215s
  39  -4.10834862e+06 -4.07469107e+06  2.20e-05 7.42e-11  7.05e-03   219s
  40  -4.10704743e+06 -4.07526754e+06  2.07e-05 9.26e-11  6.66e-03   223s
  41  -4.10491259e+06 -4.07667526e+06  1.86e-05 1.92e-10  5.91e-03   227s
  42  -4.10303187e+06 -4.07695657e+06  1.67e-05 1.98e-10  5.46e-03   231s
  43  -4.10114861e+06 -4.07781343e+06  1.48e-05 2.41e-10  4.89e-03   235s
  44  -4.09910444e+06 -4.07841132e+06  1.26e-05 3.39e-10  4.33e-03   239s
  45  -4.09811867e+06 -4.07912065e+06  1.16e-05 4.34e-10  3.98e-03   244s
  46  -4.09650464e+06 -4.07971227e+06  1.00e-05 4.74e-10  3.52e-03   248s
  47  -4.09633635e+06 -4.07992365e+06  9.86e-06 4.78e-10  3.44e-03   252s
  48  -4.09573883e+06 -4.08058667e+06  9.26e-06 5.16e-10  3.17e-03   256s
  49  -4.09432796e+06 -4.08121481e+06  7.88e-06 5.64e-10  2.75e-03   261s
  50  -4.09418756e+06 -4.08168963e+06  7.74e-06 5.51e-10  2.62e-03   265s
  51  -4.09237431e+06 -4.08200101e+06  5.94e-06 5.62e-10  2.17e-03   269s
  52  -4.09183171e+06 -4.08277521e+06  5.41e-06 5.24e-10  1.90e-03   273s
  53  -4.09131749e+06 -4.08302624e+06  4.91e-06 4.96e-10  1.74e-03   277s
  54  -4.09073574e+06 -4.08315392e+06  4.34e-06 4.71e-10  1.59e-03   282s
  55  -4.08880700e+06 -4.08374246e+06  2.44e-06 4.24e-10  1.06e-03   287s
  56  -4.08824447e+06 -4.08468567e+06  1.89e-06 2.78e-10  7.45e-04   291s
  57  -4.08802720e+06 -4.08504652e+06  1.69e-06 2.11e-10  6.24e-04   295s
  58  -4.08791052e+06 -4.08507727e+06  1.59e-06 2.04e-10  5.93e-04   299s
  59  -4.08707643e+06 -4.08564690e+06  7.99e-07 1.14e-10  2.99e-04   303s
  60  -4.08695229e+06 -4.08576428e+06  6.87e-07 2.39e-10  2.49e-04   308s
  61  -4.08666952e+06 -4.08598019e+06  4.33e-07 2.67e-10  1.44e-04   312s
  62  -4.08660758e+06 -4.08603171e+06  3.79e-07 1.41e-10  1.21e-04   317s
  63  -4.08640686e+06 -4.08604650e+06  1.95e-07 3.07e-11  7.55e-05   320s
  64  -4.08631975e+06 -4.08616253e+06  1.15e-07 2.47e-10  3.29e-05   324s
  65  -4.08620218e+06 -4.08618310e+06  1.40e-08 1.20e-10  4.00e-06   327s
  66  -4.08618536e+06 -4.08618455e+06  5.44e-10 5.38e-10  1.70e-07   330s
  67  -4.08618468e+06 -4.08618468e+06  1.15e-09 1.64e-09  3.56e-10   332s

Barrier solved model in 67 iterations and 332.29 seconds
Optimal objective -4.08618468e+06


Root crossover log...

  652064 DPushes remaining with DInf 0.0000000e+00               334s
  319521 DPushes remaining with DInf 0.0000000e+00               335s
  276718 DPushes remaining with DInf 0.0000000e+00               341s
  276290 DPushes remaining with DInf 0.0000000e+00               346s
  275947 DPushes remaining with DInf 0.0000000e+00               351s
  275591 DPushes remaining with DInf 0.0000000e+00               356s
  275169 DPushes remaining with DInf 0.0000000e+00               361s
  274733 DPushes remaining with DInf 0.0000000e+00               365s
  274342 DPushes remaining with DInf 0.0000000e+00               370s
  133852 DPushes remaining with DInf 0.0000000e+00               376s
  121958 DPushes remaining with DInf 0.0000000e+00               381s
  116210 DPushes remaining with DInf 0.0000000e+00               386s
  112265 DPushes remaining with DInf 0.0000000e+00               391s
  108850 DPushes remaining with DInf 0.0000000e+00               396s
  105995 DPushes remaining with DInf 0.0000000e+00               401s
  103345 DPushes remaining with DInf 0.0000000e+00               406s
  101066 DPushes remaining with DInf 0.0000000e+00               411s
   98675 DPushes remaining with DInf 0.0000000e+00               416s
   96533 DPushes remaining with DInf 0.0000000e+00               421s
   94384 DPushes remaining with DInf 0.0000000e+00               425s
   92505 DPushes remaining with DInf 0.0000000e+00               430s
   89622 DPushes remaining with DInf 0.0000000e+00               437s
   87695 DPushes remaining with DInf 0.0000000e+00               442s
   85973 DPushes remaining with DInf 0.0000000e+00               447s
   84268 DPushes remaining with DInf 0.0000000e+00               451s
   82731 DPushes remaining with DInf 0.0000000e+00               456s
   81080 DPushes remaining with DInf 0.0000000e+00               461s
   79585 DPushes remaining with DInf 0.0000000e+00               466s
   77977 DPushes remaining with DInf 0.0000000e+00               471s
   76470 DPushes remaining with DInf 0.0000000e+00               476s
   74969 DPushes remaining with DInf 0.0000000e+00               480s
   73510 DPushes remaining with DInf 0.0000000e+00               485s
   72124 DPushes remaining with DInf 0.0000000e+00               490s
   70805 DPushes remaining with DInf 0.0000000e+00               495s
   68847 DPushes remaining with DInf 0.0000000e+00               502s
   67520 DPushes remaining with DInf 0.0000000e+00               507s
   66378 DPushes remaining with DInf 0.0000000e+00               511s
   65128 DPushes remaining with DInf 0.0000000e+00               516s
   64034 DPushes remaining with DInf 0.0000000e+00               521s
   62872 DPushes remaining with DInf 0.0000000e+00               526s
   61734 DPushes remaining with DInf 0.0000000e+00               531s
   60671 DPushes remaining with DInf 0.0000000e+00               536s
   59565 DPushes remaining with DInf 0.0000000e+00               541s
   58537 DPushes remaining with DInf 0.0000000e+00               546s
   57508 DPushes remaining with DInf 0.0000000e+00               551s
   56390 DPushes remaining with DInf 0.0000000e+00               556s
   55413 DPushes remaining with DInf 0.0000000e+00               561s
   54338 DPushes remaining with DInf 0.0000000e+00               567s
   53358 DPushes remaining with DInf 0.0000000e+00               572s
   52441 DPushes remaining with DInf 0.0000000e+00               577s
   51534 DPushes remaining with DInf 0.0000000e+00               581s
   50702 DPushes remaining with DInf 0.0000000e+00               587s
   49880 DPushes remaining with DInf 0.0000000e+00               592s
   49139 DPushes remaining with DInf 0.0000000e+00               597s
   48759 DPushes remaining with DInf 0.0000000e+00               600s
   48112 DPushes remaining with DInf 0.0000000e+00               605s
   47451 DPushes remaining with DInf 0.0000000e+00               610s
   46835 DPushes remaining with DInf 0.0000000e+00               616s
   46255 DPushes remaining with DInf 0.0000000e+00               622s
   45712 DPushes remaining with DInf 0.0000000e+00               627s
   45447 DPushes remaining with DInf 0.0000000e+00               630s
   44910 DPushes remaining with DInf 0.0000000e+00               636s
   44438 DPushes remaining with DInf 0.0000000e+00               641s
   43945 DPushes remaining with DInf 0.0000000e+00               646s
   43463 DPushes remaining with DInf 0.0000000e+00               652s
   42999 DPushes remaining with DInf 0.0000000e+00               658s
   42790 DPushes remaining with DInf 0.0000000e+00               660s
   42314 DPushes remaining with DInf 0.0000000e+00               666s
   41849 DPushes remaining with DInf 0.0000000e+00               671s
   41393 DPushes remaining with DInf 0.0000000e+00               676s
   40932 DPushes remaining with DInf 0.0000000e+00               680s
   40429 DPushes remaining with DInf 0.0000000e+00               685s
   39938 DPushes remaining with DInf 0.0000000e+00               690s
   39436 DPushes remaining with DInf 0.0000000e+00               695s
   38930 DPushes remaining with DInf 0.0000000e+00               700s
   38145 DPushes remaining with DInf 0.0000000e+00               707s
   37624 DPushes remaining with DInf 0.0000000e+00               712s
   37093 DPushes remaining with DInf 0.0000000e+00               716s
   36531 DPushes remaining with DInf 0.0000000e+00               721s
   36009 DPushes remaining with DInf 0.0000000e+00               726s
   35475 DPushes remaining with DInf 0.0000000e+00               730s
   34669 DPushes remaining with DInf 0.0000000e+00               737s
   34101 DPushes remaining with DInf 0.0000000e+00               742s
   33557 DPushes remaining with DInf 0.0000000e+00               746s
   32995 DPushes remaining with DInf 0.0000000e+00               751s
   32458 DPushes remaining with DInf 0.0000000e+00               755s
   31643 DPushes remaining with DInf 0.0000000e+00               762s
   31107 DPushes remaining with DInf 0.0000000e+00               767s
   30544 DPushes remaining with DInf 0.0000000e+00               772s
   29962 DPushes remaining with DInf 0.0000000e+00               776s
   29388 DPushes remaining with DInf 0.0000000e+00               781s
   28806 DPushes remaining with DInf 0.0000000e+00               786s
   28184 DPushes remaining with DInf 0.0000000e+00               791s
   27623 DPushes remaining with DInf 0.0000000e+00               796s
   26990 DPushes remaining with DInf 0.0000000e+00               801s
   26406 DPushes remaining with DInf 0.0000000e+00               806s
   25815 DPushes remaining with DInf 0.0000000e+00               811s
   25180 DPushes remaining with DInf 0.0000000e+00               816s
   24575 DPushes remaining with DInf 0.0000000e+00               821s
   23968 DPushes remaining with DInf 0.0000000e+00               826s
   23394 DPushes remaining with DInf 0.0000000e+00               831s
   22855 DPushes remaining with DInf 0.0000000e+00               835s
   22345 DPushes remaining with DInf 0.0000000e+00               840s
   21865 DPushes remaining with DInf 0.0000000e+00               845s
   21401 DPushes remaining with DInf 0.0000000e+00               850s
   20723 DPushes remaining with DInf 0.0000000e+00               857s
   20217 DPushes remaining with DInf 0.0000000e+00               862s
   19557 DPushes remaining with DInf 0.0000000e+00               867s
   19153 DPushes remaining with DInf 0.0000000e+00               871s
   18843 DPushes remaining with DInf 0.0000000e+00               876s
   18277 DPushes remaining with DInf 0.0000000e+00               882s
   17632 DPushes remaining with DInf 0.0000000e+00               885s
   15995 DPushes remaining with DInf 0.0000000e+00               892s
   14763 DPushes remaining with DInf 0.0000000e+00               896s
   12898 DPushes remaining with DInf 0.0000000e+00               901s
   11723 DPushes remaining with DInf 0.0000000e+00               906s
   11337 DPushes remaining with DInf 0.0000000e+00               911s
   10942 DPushes remaining with DInf 0.0000000e+00               916s
   10555 DPushes remaining with DInf 0.0000000e+00               921s
       0 DPushes remaining with DInf 0.0000000e+00               925s

  198443 PPushes remaining with PInf 2.4354221e-05               925s
       0 PPushes remaining with PInf 0.0000000e+00               927s

  Push phase complete: Pinf 0.0000000e+00, Dinf 1.8299394e-11    927s


Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
  428736   -4.0861847e+06   0.000000e+00   0.000000e+00    928s
  428736   -4.0861847e+06   0.000000e+00   0.000000e+00    931s

【问题讨论】：

日志显示您的模型存在数值问题。你能先解决这个问题然后再试一次吗？
谢谢格雷格，是的，我也看到了这一点，并将矩阵范围关闭到可接受的数字。我仍然遇到同样的问题......
谢谢，请使用数字更清晰的版本发布日志。
我做到了，我减少了不必要的大 M 值，并将一些微小的太阳辐照度设为零。忽略不同的客观价值。我使用了不同的输入数据
实际上，在 Presolve 之后，这不再是 MIP。这里发生了什么？

标签： optimization pyomo gurobi

【解决方案1】：

它再次工作:) 我不是 100% 确定问题出在哪里，但我认为是这样的：

if grid_limit != -1:
    def gridImportLimit_rule(m,y,ts):
        return m.gridImport[y,ts] <= grid_limit
    m.const_gridImportLimit = Constraint(year_i, ts_i, rule = gridImportLimit_rule)
    
    def gridExportLimit_rule(m,y,ts):
        return m.gridExport[y,ts] <= grid_limit
    m.const_gridExportLimit = Constraint(year_i, ts_i, rule = gridExportLimit_rule)

每当我使用 -1 作为输入来指定我不想约束网格时，我都会遇到提到的问题。当我改用大限制（具有相同效果）时，程序运行良好。

为你的帮助干杯:)

【讨论】：